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1 Ebbing9EE_EV_BB6x7x_Ch2zip Student: 1 Dalton s atomic theory consisted of all the following postulates EXCEPT A Atoms of different elements have different properties B Elements are composed of indivisible particles called atoms C With gases, the volumes consumed and produced are in ratios of small whole numbers D Atoms combine in fixed ratios of whole numbers E In chemical changes, atoms are not destroyed, created, or changed 1

2 2 Which of the following pictures is a particulate representation of a liquid mixture of two elements? A B C D E 3 Which of the following is not a correct name symbol combination? A arsenic, Ar B manganese, Mn C copper, Cu D gold, Au E lithium, Li 2

3 4 The symbol for tin is A Ti B Tn C T D Sn E Si 5 What is the symbol for the element phosphorus? A K B P C Pr D Po E Pt 6 Which one of the following lists gives the correct symbols for the elements phosphorus, potassium, silver, chlorine, and sulfur? A K, Ag, Po, Cl, S B P, Po, Ag, Cl, S C Ph, K, Ag, S, Cl D P, K, Ag, Cl, S E Ph, Po, Ag, Cl, S 7 Which of the following lists gives the atomic symbols for potassium, magnesium, beryllium, and sodium? A P, Mn, Be, Se B Po, Mn, Br, Na C Pt, Mg, Be, Sc D K, Mn, Br, Na E K, Mg, Be, Na 8 The names of the elements whose symbols are Si, P, Mn, and S are, respectively, A silicon, potassium, manganese, and sulfur B silver, phosphorus, magnesium, and sodium C silicon, potassium, magnesium, and sulfur D silver, potassium, manganese, and sodium E silicon, phosphorus, manganese, and sulfur 9 Which of the following is not a correct name symbol combination? A beryllium, Be B boron, B C cobalt, Co D magnesium, Mn E copper, Cu 10 Which of the following is the atomic symbol for the element cobalt? A C B CO C Co D co E All of the above 3

4 11 A series of silicon hydrogen compounds with the general formula Si n H 2n+2 can be represented by the known compounds SiH 4, Si 2 H 6, and Si 3 H 8 This best illustrates the law of A conservation of mass B conservation of charge C conservation of atoms D definite composition E multiple proportions 12 According to the law of multiple proportions: A if the same two elements form two different compounds, they do so in the same ratio B it is not possible for the same two elements to form more than one compound C the ratio of the masses of the elements in a compound is always the same D the total mass is the same after a chemical change as before the change E none of these 13 Which of the following pairs of compounds can be used to illustrate the law of multiple proportions? A NH 4 and NH 4 Cl B ZnO 2 and ZnCl 2 C H 2 O and HCl D NO and NO 2 E CH 4 and CO 2 14 Cathode rays are A cations B electrons C positrons D protons E anions 15 Experiments were carried out in which a beam of cathode rays was first bent by a magnetic field and then bent back by an electrostatic field until the beam hit the screen exactly where it had been hitting before the fields were applied This experiment permitted the direct measurement of A the charge on the nucleus of an atom B the charge on the electron C the ratio of mass to charge of an electron D the mass of the electron E the mass of the atom 16 Who discovered the electron? A Rutherford B de Broglie C Bohr D Thomson E Heisenberg 17 Which of the following is a correct conclusion that may be drawn from the results of Rutherford's gold foil experiments? A All positively charged alpha particles pass directly through gold foil B Alpha particles are positively charged helium nuclei C Alpha particles collide with the electrons of gold atoms, causing the atoms to become cations D Some alpha particles are scattered by the nuclei of gold atoms E There is negligible interaction between alpha particles and gold atoms 4

5 18 Who discovered the nucleus of an atom? A Rutherford B de Broglie C Bohr D Thomson E Heisenberg 19 If the Thomson model of the atom had been correct, Rutherford would have observed A alpha particles going through the foil with little or no deflection B alpha particles greatly deflected by the metal foil C alpha particles bouncing off the foil D positive particles formed in the foil E None of the above observations is consistent with the Thomson model of the atom 20 The nucleus of a 208 Pb nuclide contains A 82 protons and 208 neutrons B 82 protons and 126 neutrons C 208 protons and 126 electrons D 208 protons, 82 neutrons, and 208 electrons E 208 neutrons and 290 electrons 21 If two different nuclides have the same atomic number, it must mean that A they have the same atomic mass B they have the same number of protons C they have the same number of neutrons D they have the same number of electrons E they have the same mass number 22 If two different nuclides have the same mass number, it must mean that A both have the same total number of protons B both have the same total number of neutrons C both have the same total number of protons and neutrons D both have the same total number of electrons E they are isotopes 23 The number of protons in a given nucleus determines the A number of electrons B atomic number C mass number D number of protons E number of isotopes 5

6 24 Which nuclide has the same number of protons as? A B C D E 25 How many electrons does the ion have? A 25 B 27 C 29 D 32 E How many protons are there in the titanium-48 nuclide? A 21 B 22 C 26 D 27 E How many neutrons are there in the cobalt-59 nuclide? A 86 B 59 C 27 D 32 E 2 28 An atom that has the same number of neutrons as is A B C D E 6

7 29 Which combination of protons, neutrons, and electrons correctly represents a 58 Fe nuclide? A 58 protons, 26 neutrons, 26 electrons B 58 protons, 26 neutrons, 58 electrons C 26 protons, 32 neutrons, 58 electrons D 26 protons, 32 neutrons, 32 electrons E 26 protons, 32 neutrons, 26 electrons 30 The species that has the same number of neutrons as is A B C D E 31 Which of the following nuclides contains more electrons than neutrons? A B C D E 32 How many neutrons are there in 10 molecules of? A 40 B 64 C 160 D 640 E

8 33 Suppose atom 1 has the same number of protons as atom 2, and atom 2 has the same number of neutrons as atom 3 Atom 1 does not have the same number of neutrons as atom 3 Which of the following statements is true? A Atom 2 must have the same number of neutrons as atom 1 B Atom 3 must have the same number of protons as atom 1 C Atoms 1 and 3 must be isotopes D Atom 3 must have the same number of protons as atom 2 E Atoms 1 and 2 must be isotopes 34 Which of the following statements is true concerning the two nuclides and? A They have the same number of neutrons B They have the same relative atomic mass C They have the same mass number D They have different chemical properties E They are isotopes 35 Which of the following atomic symbols represents an isotope of? A B C D E 36 Which of the following represents a pair of isotopes? Atomic Number Mass Number A I 7 15 II 8 15 B I II C I 7 16 II 8 17 D I II E I II There are three isotopes of carbon differing with respect to A neutrons B atomic number C nuclear charge D electron configuration E number of protons 8

9 38 The neutral atoms of all the isotopes of the same element have A different numbers of protons B the same number of neutrons C the same number of electrons D the same mass number E the same mass 39 What is the symbol of the nuclide having 17 protons and 18 neutrons? A B C D E 40 Which of the following has 61 neutrons, 47 protons, and 46 electrons? A Pm B Ag + C Pd D Cd + E Ag 41 Which of the following elements has the largest atomic mass? A fluorine B thallium C manganese D rhenium E argon 9

10 42 The mass spectrum of an element with two naturally occurring isotopes is shown below Its atomic mass would be best estimated as A 630 amu B 634 amu C 636 amu D 638 amu E 640 amu 43 A certain element is listed as having an atomic mass of 635 amu It is probably true that this element contains A a mixture of isomers B a mixture of allotropes C a mixture of neutrons D a mixture of ions E a mixture of isotopes 44 The average atomic mass of Eu is amu There are only two naturally occurring isotopes of europium, 151 Eu with a mass of 1510 amu and 153 Eu with a mass of 1530 amu The natural abundance of the 131 Eu isotope must be approximately A 20% B 40% C 50% D 60% E 80% 10

11 45 Naturally occurring element X exists in three isotopic forms: X-28 (27978 amu, 9221% abundance), X-29 (28976 amu, 470% abundance), and X-30 (29974 amu, 309% abundance) Calculate the atomic weight of X A 281 amu B 353 amu C 291 amu D 869 amu E 258 amu 46 There are only two naturally occurring isotopes of copper, 63 Cu and 65 Cu The natural abundance of the 65Cu must be about A 15% B 30% C 40% D 50% E 85% 47 An element, X, has the following isotopic composition: X-200, 90%; X-199, 80%; and X-202, 20% Its average atomic mass is closest to A 199 amu B 200 amu C 201 amu D 202 amu E 203 amu 48 A periodic law based on atomic masses would necessitate Te and I changing places in the periodic table This was not done in the early periodic table because A it was thought that the atomic masses might be in error B iodine contains one naturally occurring isotope, whereas tellurium consists of several isotopes C a periodic law based on atomic masses is not valid D the tellurium samples could contain a heavy impurity E iodine behaves chemically like chlorine and bromine 49 The elements in a row of the periodic table are known as A a family B a group C metals D metalloids E a period 50 All of the following statements about different elements are true except A Potassium is an alkali metal B Aluminum is a transition element C Barium is an alkaline earth metal D Fluorine is a halogen E Helium is a noble gas 11

12 51 Which of the following statements is not true about the element nickel? A It is in group VIIIB (group 10) B It is a metal C It is in period 4 D It tends to form anions E It is a transition metal 52 The elements in this group are termed alkali metals A Group 1A B Group 2A C Group 3A D Group 4A E Group 5A 53 Choose the group containing the most reactive nonmetals A Group 1A B Group 3A C Group 5A D Group 7A E Group 8A 54 Which element belongs to the halogen group? A bromine B magnesium C oxygen D lithium E nitrogen 55 Which of the following statements about different elements are true? 1 As is a metalloid and Se is a nonmetal 2 Cu is a transition element and Ge is a metalloid 3 Both F and I are halogens A 1 only B 2 only C 3 only D 1 and 2 only E 1, 2, and 3 56 Which of the following is a metalloid? A carbon B oxygen C hydrogen D copper E silicon 57 All of the following elements are best classified as metalloids except A B B Si C Ga D As E Te 12

13 58 Which of the following models best represents the ammonia molecule, NH 3? A B C D E None of these could represent NH 3 59 In a particular mass of KAu(CN, there are atoms of gold What is the total number of atoms in this sample? A B C D E A sample of TNT, C 7 H 5 N 3 O 6, has nitrogen atoms How many hydrogen atoms are there in this sample of TNT? A B C D E A 15-g sample of washing soda, Na 2 CO 3 10H 2 O, has carbon atoms How many oxygen atoms are present in 15 g of washing soda? A B C D E 62 A sample of the mineral troegerite, (UO 2 (AsO 4 12H 2 O, has U atoms How many arsenic atoms are present in this sample of troegerite? A B C D E

14 63 An ion is formed A by either adding protons to or subtracting protons from the atom B by either adding electrons to or subtracting electrons from the atom C by either adding neutrons to or subtracting neutrons from the atom D All of the above are true E Two of the above are true 64 The species Na +, Mg 2+, and Al 3+ are all A anions B cations C isotopes D isoelectronic E allotropes 65 The species that is formed when a molecule gains an electron is called A an anion B a cation C an isotope D a charge mass ratio E an isomer 66 Which of the following statements is true about one formula unit of MgCl 2? A It is composed of one Mg atom and one Cl 2 molecule B It is composed of one MgCl 2 molecule C It is composed of one Mg atom and two Cl atoms D It is composed of one Mg 2+ ion and two Cl ions E It is composed of one Mg 2+ ion and one Cl 2 2 ion 67 Chemical reactions between nonmetals and nonmetals primarily involve A interactions between protons B interactions between protons and electrons C interactions among protons, electrons, and neutrons D transfer of electrons E sharing of electrons 68 Which of the following is an ionic compound? A CH 3 OH B HOClO C NH 4 CN D NH 3 E N 2 O 3 69 The formula of water, H 2 O, suggests A there is twice as much mass of hydrogen as oxygen in each molecule B there are two hydrogen atoms and one oxygen atom per water molecule C there is twice as much mass of oxygen as of hydrogen in each molecule D there are two oxygen atoms and one hydrogen atom per water molecule E none of these 14

15 70 How many oxygen atoms are there in a formula unit of UO 2 (C 2 H 3 O 2 NH 4 C 2 H 3 O 2 2H 2 O? A 4 B 8 C 17 D 10 E 6 71 What is the ratio of oxygen atoms to hydrogen atoms in the compound Fe 4 (PO 4 (OH 12H 2 O? A 15:3 B 27:15 C 27:27 D 18:27 E 25:17 72 What is the ratio of oxygen atoms to hydrogen atoms in the mineral carnotite, K 2 (UO 2 (VO 4 3H 2 O? A 8:3 B 8:6 C 9:6 D 17:3 E 17:6 73 Which statement is incorrect concerning the formation of ionic compounds? A Metals tend to form cations, while nonmetals tend to form anions B Alkali metals tend to form cations with a charge of +1 C Transition metals tend to form cations with a charge of +3 D Halogens tend to form anions with a charge of 1 E Noble gases tend not to form ionic compounds 74 The empirical formula of a salt consisting of Ca 2+ and Cl ions is A CaCl B Ca 2 Cl 3 C CaCl 2 D Ca 2+ Cl E Ca 2 Cl 75 What is the formula for the binary compound formed between Al 3+ and Se 2 ions? A AlSe B Al 2 Se C Al 2 Se 3 D Al 3 Se 2 E AlSe 3 76 Which of the following molecules is a hydrocarbon? A CH 3 OCH 3 B C 6 H 12 O 6 C CH 3 CH 2 CH 3 D CH 3 CH 2 OH E H 2 O 15

16 77 Which of the following molecules contains the ether functional group? A CH 3 CH 2 OCH 2 CH 3 B CH 3 CH 2 OH C H 2 O D CH 3 CH 2 COOH E CH 3 CH 2 NH 2 78 Which of the following molecules contains the carboxylic acid functional group? A CH 3 NHCH 3 B CH 3 OCH 2 CH 3 C CH 3 CH 2 CH 2 OH D CH 3 CH 2 COCH 2 CH 3 E CH 3 CH 2 CH 2 COOH 79 Which of the following molecules contains the alcohol functional group? A CH 4 B CH 3 OCH 3 C CH 3 OH D C 6 H 6 E C 2 H 2 80 How many electrons does a barium ion have? A 2 B 8 C 54 D 56 E Which of the following statements is false? A A potassium ion has a total of 18 e B A sulfide ion has a total of 18 e C A sodium atom is most likely to ionize to form a cation of charge +1 D The charge on a neutral chlorine atom is zero E A crystal of calcium fluoride has equal numbers of calcium ions and fluoride ions 82 How many electrons does a aluminum ion have? A 28 B 24 C 14 D 13 E How many electrons does a chloride ion have? A 2 B 15 C 17 D 18 E 22 16

17 84 Which metals form cations with varying positive charges? A transition metals B Group 1 metals C Group 2 metals D Group 3 metals E metalloids 85 Which of the following represents a known ion? A Na B Sc 4+ C Sn 2+ D S 2+ E P 4 86 The formula for the sulfide ion is A S 2 B S 2 O 3 2 C SO 3 2 D SO 4 2 E HSO 4 87 The correct name for Ca 2+ is A calcium B calcium(ii) ion C calcium ion D calcium(i) ion E monocalcium ion 88 The formula of the hypochlorite ion is A ClO B ClO 2 C Cl 2 O 3 D ClO 3 E CN 89 The name of the SO 4 2 ion is A persulfate B sulfite C thiosulfite D sulfate E sulfide 90 The formulas of the nitrite, phosphate, and nitrate ions are represented, respectively, as A NO 2, PO4 3, NO3 B N 3, PO 3 3, NO3 C NO, P 5, NO 3 D NO 2, P 3, NO3 E NO 3, PO2, N 3 17

18 91 The formulas of the hydroxide ion, the nitrate ion, and the phosphate ion are represented, respectively, as A OH, NO 3, PO4 3 B H, NO 2, P 3 C H, NO 3, P 3 D OH, NO 2, PO3 3 E OH, NO 2, PO All the following ions have the same charge except A sulfide B sulfite C sulfate D chlorate E dichromate 93 All the following ions have the same charge except A oxalate B permanganate C oxide D peroxide E monohydrogen phosphate 94 The formulas of the carbonate ion, the ammonium ion, and the chlorate ion are represented, respectively, as A CO 3 2, NH2, ClO3 B CO 3 2, NH3 +, ClO2 C CO 2, NH4 +, ClO D CO 3 2, NH4 +, ClO3 E P 3, NH 3 +, ClO2 95 The systematic name for BaH 2 is A barium dihydrogen B barium dihydride C barium(ii) hydrate D barium dihydrate E barium hydride 96 What is the name of the compound whose formula is Al 2 (SO 4? A aluminum sulfide B aluminum sulfite C aluminum sulfate D aluminum persulfate E dialuminum tri(sulfur tetraoxygen) 97 The correct name for FeO is A iron oxide B iron(ii) oxide C iron(iii) oxide D iron monoxide E iron(i) oxide 18

19 98 What is the formula for the chloride of praseodymium(iii)? A Pr 3 Cl B PrCl 3 C Pr 2 (ClO 2 D Pr(ClO 4 E Pr(ClO 3 99 The correct formula for gallium oxide is A GaO B Ga 2 O C GaO 2 D Ga 2 O 3 E Ga 3 O 2 100What is the formula for calcium nitride? A Ca 3 N 2 B Ca 2 N 3 C CaNO 2 D Ca(NO 2 E Ca(NO 3 101The formula of calcium sulfide is A CaS B CaSO 2 C CaSO 4 D CaSO 3 E Ca(SO 4 102What is the formula of magnesium nitrite? A Mg 3 N 2 B Mg 2 N 3 C Mg(NO 2 D Mg(NO 2 E Mg 2 (NO 2 103The formula for aluminum chloride is A AlC B AlCl C Al 2 Cl 3 D AlCl 2 E AlCl 3 104The chemical formula for iron(iii) sulfide is A Fe 2 (SO 3 B Fe 2 (SO 4 C Fe 2 S 3 D Fe 3 (SO 3 E Fe 3 (SO 4 19

20 105The formula for aluminum sulfate is A Al 3 (SO 4 B Al 2 (SO 4 C Al 2 (SO 3 D Al 3 S 2 E Al 2 S 3 106The formula for copper(ii) phosphate is A CuPO 4 B Cu 3 (PO 4 C Co 2 (PO 4 D Cu 2 (PO 4 E Co 3 (PO 4 107Choose the name formula pair that does not match A sodium sulfite, Na 2 SO 3 B calcium fluoride, CaF 2 C potassium permanganate, K 2 MnO 4 D aluminum oxide, Al 2 O 3 E iron(iii) oxide, Fe 2 O 3 108Choose the name formula pair that does not match A ammonium hydrogen carbonate, NH 4 CO 3 B sodium chlorite, NaClO 2 C calcium hydride, CaH 2 D nitric acid, HNO 3 E calcium hydroxide, Ca(OH 109The formula for aluminum bromide is A ABr B AlBr C AlBr 2 D AlBr 3 E AlBr 4 110The formula for potassium carbonate is A P 2 CO 3 B K 2 CO 3 C Po 2 CO 3 D P 2 C E K 2 C 111The formula for magnesium nitride is A MgN B MgNO 2 C Mg 2 N 3 D Mg(NO 2 E Mg 3 N 2 20

21 112What is the subscript of potassium in the formula for potassium sulfate? A 1 B 2 C 3 D 4 E 5 113What is the formula for sodium peroxide? A NaO B Na 2 O C NaO 2 D Na 2 O 2 E Na 3 O 2 114What is the formula for the chlorate of praseodymium(iii)? A PrCl 2 B PrCl 3 C Pr 2 (ClO 3 D Pr(ClO 4 E Pr(ClO 3 115What is the formula for the nitride of samarium(iii)? A Sm 2 N 3 B Sm(NO 3 C Sm(NO 2 D Sm(NO 3 E SmN 116The correct name for LiCl is A lithium monochloride B lithium(i) chloride C monolithium chloride D lithium chloride E monolithium monochloride 117The chemical name for the model is A nitric oxide B nitrogen oxide C nitrogen trioxide D nitrogen tetroxide E dinitrogen tetroxide 118The formula for perchloric acid is A HClO B HClO 4 C HClO 2 D HClO 3 E HCl 21

22 119Which name formula pair is incorrect? A H 2 SO 3, sulfurous acid B HClO 2, chlorous acid C H 2 CO 3, carbonic acid D HBr, hydrobromic acid E H 3 P, phosphoric acid 120Which name formula pair is incorrect? A magnesium sulfate heptahydrate, MgSO 4 7H 2 O B strontium nitride, Sr 3 N 2 C titanium(iv) carbide, TiC D dinitrogen tetroxide, N 2 O 4 E hypochlorous acid, HClO 2 121The oxoanion that comes from nitrous acid is A NO B NO 2 C NO 3 D N 2 O 3 E HNO 3 122For the following balanced chemical equation, which substance represents the catalyst? 2CO(g) + 2NO(gCO 2 (g) + N 2 (g) A CO(g) B NO(g) C Rh(s) D CO 2 (g) E N 2 (g) 123What is the balanced chemical equation that represents the following reaction? A 6H + 2N 2NH 3 B 3H 2 + N 2 2NH 3 C 2N + 2H 3 2H 3 N D 6H + 2N 2N 3 H E 6H + 2N 2HN 3 124In the following chemical equation, what is the reactant? CuSO 4 5H 2 O(s) CuO(s) + SO 3 (g) + 5H 2 O(l) A CuSO 4 (s) B CuSO 4 5H 2 O(s) C CuO(s) D SO 3 (g) E H 2 O(l) 22

23 125Which is a correct balanced chemical equation corresponding to the following description of a chemical reaction? Hydrochloric acid reacts with magnesium metal to produce aqueous magnesium chloride and hydrogen gas A HCl(aq) + Mg(s) MgCl(aq) + H(g) B 2HCl(aq) + Mg(s) MgCl(aq) + H 2 (g) C 2HCl(aq) + Mg(aq) MgCl 2 (s) + H 2 (g) D 2HCl(aq) + Mg(s) MgCl 2 (aq) + 2H(g) E 2HCl(aq) + Mg(s) MgCl 2 (aq) + H 2 (g) 126Which is a correct balanced chemical equation corresponding to the following description of a chemical reaction? Sulfuric acid reacts with aqueous sodium hydroxide to produce aqueous sodium sulfate and water A H 2 S(aq) + NaOH(aq) NaS(aq) + H 2 O(l) B H 2 SO 4 (aq) + 2NaOH(aq) Na 2 SO 4 (aq) + 2H 2 O(l) C H 2 S(aq) + 2NaOH(aq) Na 2 S(aq) + 2H 2 O(l) D H 2 SO 4 (aq) + NaOH(aq) NaSO 4 (aq) + H 2 O(l) E H 2 SO 4 (aq) + 2NaOH(aq) Na 2 S(aq) + 2H 2 O(l) + 2O 2 (g) 127How many of the following statements are true concerning chemical equations? I Coefficients can be fractions II Subscripts can be fractions III Coefficients represent the relative masses of the reactants and/or products IV Changing the subscripts to balance an equation can be done only once V Atoms are conserved when balancing chemical equations A 1 B 2 C 3 D 4 E 5 128When the following equation is balanced with lowest whole-number coefficients, what is the coefficient for NO(g)? NH 3 (g) + O 2 (g) NO(g) + H 2 O(g) A 1 B 2 C 3 D 4 E 5 129The complete combustion of heptane, C 7 H 16, yields carbon dioxide and water: The smallest whole-number coefficient of oxygen in the balanced equation is A 9 B 10 C 11 D 12 E 13 23

24 130The complete combustion of hexane, C 6 H 14, yields carbon dioxide and water: The smallest whole-number coefficient of oxygen in the balanced equation is A 16 B 17 C 18 D 19 E The products of the combustion of acetaldehyde with oxygen are shown in the following equation: CH 3 CHO + O 2 CO 2 + H 2 O When properly balanced, the equation indicates that molecules of O 2 are required to burn 2 molecules of CH 3 CHO A 2 B 3 C 4 D 5 E 6 132Energy from the following reaction provided the lift for the moon lander: (CH 3 N 2 H 2 + N 2 O 4 N 2 + H 2 O + CO 2 When the equation is balanced, the smallest whole-number coefficient of nitrogen is A 1 B 2 C 3 D 4 E 5 133Treatment of sodium borohydride with sulfuric acid is a convenient method for the preparation of diborane: NaBH 4 + H 2 SO 4 B 2 H 6 + H 2 + Na 2 SO 4 When the equation is balanced, the coefficient for hydrogen is A 1 B 2 C 3 D 4 E 5 134All the following may change during a chemical reaction except A the total number of atoms in the system B the temperature of the system C the density of the system D the total number of molecules in the system E the total volume of the system 24

25 135The complete combustion of phenylhydrazine, C 6 H 5 NHNH 2, with the oxidizer dinitrogen tetraoxide is shown in the following equation: C 6 H 5 NHNH 2 + N 2 O 4 CO 2 + H 2 O + N 2 When this equation is balanced, the sum of all the coefficients (using smallest whole numbers) is A 10 B 15 C 20 D 25 E The complete combustion of pentane yields carbon dioxide and water When the equation C 5 H 12 (l) + O 2 (g) CO 2 (g) + H 2 O(l) is balanced, the ratio of the coefficient of CO 2 to the coefficient of O 2 is A 5:8 B 8:5 C 5:6 D 6:5 E 8:6 137A reaction occurs between sodium carbonate and hydrochloric acid, producing sodium chloride, carbon dioxide, and water Which is the correct set of coefficients, respectively, for the balanced reaction? A B C D E none of these 138When the equation (CH 3 NNH 2 + N 2 O 4 N 2 + H 2 O + CO 2 is balanced, the sum of all the coefficients (simplest whole number) is A 9 B 10 C 11 D 12 E When the equation C 5 H 6 N 2 OS(s) + O 2 (g) CO 2 (g) + H 2 O(l) + N 2 (g) + SO 2 (g) is balanced, the sum of all the coefficients (simplest whole number) is A 18 B 19 C 20 D 21 E Ammonia can be made by reaction of water with magnesium nitride: Mg 3 N 2 (s) + H 2 O(l) Mg(OH (s) + NH 3 (g) When the equation is properly balanced, the sum of the coefficients is A 6 B 8 C 9 D 12 E 14 25

26 141Which one of the following equations is properly balanced? A NH 4 NO 3 2H 2 O + N 2 B CH 3 CHO + 3O 2 2CO 2 + 2H 2 O C Sn + 4HNO 3 SnO 2 + 4NO 2 + 2H 2 O D 2Na 2 SO 4 + 3Bi(NO 3 Bi 2 (SO 4 + 9NaNO 3 E Na 2 CO 3 + 2H 2 SO 4 Na 2 SO 4 + 2H 2 O + CO 2 142All of the following equations are balanced except A (NH 4 Cr 2 O 7 N 2 O + Cr 2 O 3 + 4H 2 O B 2NH 4 SCN + Ba(OH 8H 2 O 2NH H 2 O + Ba(SCN C C 12 H 22 O 11 12C + 11H 2 O D NH 4 NO 3 N 2 O + 2H 2 O E 2Mg + CO 2 2MgO + C 143Which of the following equations is not balanced? A 2NaCl + Pb(NO 3 PbCl 2 + 2NaNO 3 B Fe 3 O 4 + 3CO 3Fe + 3CO 2 C (NH 4 Cr 2 O 7 N 2 + 4H 2 O + Cr 2 O 3 D 2Sb 2 OS O 2 2Sb 2 O 5 + 4SO 3 E C 12 H 22 O O 2 12CO H 2 O 26

27 Ebbing9EE_EV_BB6x7x_Ch2zip Key 1 Dalton s atomic theory consisted of all the following postulates EXCEPT A Atoms of different elements have different properties B Elements are composed of indivisible particles called atoms C With gases, the volumes consumed and produced are in ratios of small whole numbers D Atoms combine in fixed ratios of whole numbers E In chemical changes, atoms are not destroyed, created, or changed 2 Which of the following pictures is a particulate representation of a liquid mixture of two elements? A B C D E 1

28 3 Which of the following is not a correct name symbol combination? A arsenic, Ar B manganese, Mn C copper, Cu D gold, Au E lithium, Li 4 The symbol for tin is A Ti B Tn C T D Sn E Si 5 What is the symbol for the element phosphorus? A K B P C Pr D Po E Pt 6 Which one of the following lists gives the correct symbols for the elements phosphorus, potassium, silver, chlorine, and sulfur? A K, Ag, Po, Cl, S B P, Po, Ag, Cl, S C Ph, K, Ag, S, Cl D P, K, Ag, Cl, S E Ph, Po, Ag, Cl, S 7 Which of the following lists gives the atomic symbols for potassium, magnesium, beryllium, and sodium? A P, Mn, Be, Se B Po, Mn, Br, Na C Pt, Mg, Be, Sc D K, Mn, Br, Na E K, Mg, Be, Na 8 The names of the elements whose symbols are Si, P, Mn, and S are, respectively, A silicon, potassium, manganese, and sulfur B silver, phosphorus, magnesium, and sodium C silicon, potassium, magnesium, and sulfur D silver, potassium, manganese, and sodium E silicon, phosphorus, manganese, and sulfur 9 Which of the following is not a correct name symbol combination? A beryllium, Be B boron, B C cobalt, Co D magnesium, Mn E copper, Cu 2

29 10 Which of the following is the atomic symbol for the element cobalt? A C B CO C Co D co E All of the above 11 A series of silicon hydrogen compounds with the general formula Si n H 2n+2 can be represented by the known compounds SiH 4, Si 2 H 6, and Si 3 H 8 This best illustrates the law of A conservation of mass B conservation of charge C conservation of atoms D definite composition E multiple proportions 12 According to the law of multiple proportions: A if the same two elements form two different compounds, they do so in the same ratio B it is not possible for the same two elements to form more than one compound C the ratio of the masses of the elements in a compound is always the same D the total mass is the same after a chemical change as before the change E none of these 13 Which of the following pairs of compounds can be used to illustrate the law of multiple proportions? A NH 4 and NH 4 Cl B ZnO 2 and ZnCl 2 C H 2 O and HCl D NO and NO 2 E CH 4 and CO 2 14 Cathode rays are A cations B electrons C positrons D protons E anions 15 Experiments were carried out in which a beam of cathode rays was first bent by a magnetic field and then bent back by an electrostatic field until the beam hit the screen exactly where it had been hitting before the fields were applied This experiment permitted the direct measurement of A the charge on the nucleus of an atom B the charge on the electron C the ratio of mass to charge of an electron D the mass of the electron E the mass of the atom 16 Who discovered the electron? A Rutherford B de Broglie C Bohr D Thomson E Heisenberg 3

30 17 Which of the following is a correct conclusion that may be drawn from the results of Rutherford's gold foil experiments? A All positively charged alpha particles pass directly through gold foil B Alpha particles are positively charged helium nuclei C Alpha particles collide with the electrons of gold atoms, causing the atoms to become cations D Some alpha particles are scattered by the nuclei of gold atoms E There is negligible interaction between alpha particles and gold atoms 18 Who discovered the nucleus of an atom? A Rutherford B de Broglie C Bohr D Thomson E Heisenberg 19 If the Thomson model of the atom had been correct, Rutherford would have observed A alpha particles going through the foil with little or no deflection B alpha particles greatly deflected by the metal foil C alpha particles bouncing off the foil D positive particles formed in the foil E None of the above observations is consistent with the Thomson model of the atom 20 The nucleus of a 208 Pb nuclide contains A 82 protons and 208 neutrons B 82 protons and 126 neutrons C 208 protons and 126 electrons D 208 protons, 82 neutrons, and 208 electrons E 208 neutrons and 290 electrons 21 If two different nuclides have the same atomic number, it must mean that A they have the same atomic mass B they have the same number of protons C they have the same number of neutrons D they have the same number of electrons E they have the same mass number 22 If two different nuclides have the same mass number, it must mean that A both have the same total number of protons B both have the same total number of neutrons C both have the same total number of protons and neutrons D both have the same total number of electrons E they are isotopes 23 The number of protons in a given nucleus determines the A number of electrons B atomic number C mass number D number of protons E number of isotopes 4

31 24 Which nuclide has the same number of protons as? A B C D E 25 How many electrons does the ion have? A 25 B 27 C 29 D 32 E How many protons are there in the titanium-48 nuclide? A 21 B 22 C 26 D 27 E How many neutrons are there in the cobalt-59 nuclide? A 86 B 59 C 27 D 32 E 2 28 An atom that has the same number of neutrons as is A B C D E 5

32 29 Which combination of protons, neutrons, and electrons correctly represents a 58 Fe nuclide? A 58 protons, 26 neutrons, 26 electrons B 58 protons, 26 neutrons, 58 electrons C 26 protons, 32 neutrons, 58 electrons D 26 protons, 32 neutrons, 32 electrons E 26 protons, 32 neutrons, 26 electrons 30 The species that has the same number of neutrons as is A B C D E 31 Which of the following nuclides contains more electrons than neutrons? A B C D E 32 How many neutrons are there in 10 molecules of? A 40 B 64 C 160 D 640 E

33 33 Suppose atom 1 has the same number of protons as atom 2, and atom 2 has the same number of neutrons as atom 3 Atom 1 does not have the same number of neutrons as atom 3 Which of the following statements is true? A Atom 2 must have the same number of neutrons as atom 1 B Atom 3 must have the same number of protons as atom 1 C Atoms 1 and 3 must be isotopes D Atom 3 must have the same number of protons as atom 2 E Atoms 1 and 2 must be isotopes 34 Which of the following statements is true concerning the two nuclides and? A They have the same number of neutrons B They have the same relative atomic mass C They have the same mass number D They have different chemical properties E They are isotopes 35 Which of the following atomic symbols represents an isotope of? A B C D E 36 Which of the following represents a pair of isotopes? Atomic Number Mass Number A I 7 15 II 8 15 B I II C I 7 16 II 8 17 D I II E I II There are three isotopes of carbon differing with respect to A neutrons B atomic number C nuclear charge D electron configuration E number of protons 7

34 38 The neutral atoms of all the isotopes of the same element have A different numbers of protons B the same number of neutrons C the same number of electrons D the same mass number E the same mass 39 What is the symbol of the nuclide having 17 protons and 18 neutrons? A B C D E 40 Which of the following has 61 neutrons, 47 protons, and 46 electrons? A Pm B Ag + C Pd D Cd + E Ag 41 Which of the following elements has the largest atomic mass? A fluorine B thallium C manganese D rhenium E argon 8

35 42 The mass spectrum of an element with two naturally occurring isotopes is shown below Its atomic mass would be best estimated as A 630 amu B 634 amu C 636 amu D 638 amu E 640 amu 43 A certain element is listed as having an atomic mass of 635 amu It is probably true that this element contains A a mixture of isomers B a mixture of allotropes C a mixture of neutrons D a mixture of ions E a mixture of isotopes 44 The average atomic mass of Eu is amu There are only two naturally occurring isotopes of europium, 151 Eu with a mass of 1510 amu and 153 Eu with a mass of 1530 amu The natural abundance of the 131 Eu isotope must be approximately A 20% B 40% C 50% D 60% E 80% 9

36 45 Naturally occurring element X exists in three isotopic forms: X-28 (27978 amu, 9221% abundance), X-29 (28976 amu, 470% abundance), and X-30 (29974 amu, 309% abundance) Calculate the atomic weight of X A 281 amu B 353 amu C 291 amu D 869 amu E 258 amu 46 There are only two naturally occurring isotopes of copper, 63 Cu and 65 Cu The natural abundance of the 65 Cu must be about A 15% B 30% C 40% D 50% E 85% 47 An element, X, has the following isotopic composition: X-200, 90%; X-199, 80%; and X-202, 20% Its average atomic mass is closest to A 199 amu B 200 amu C 201 amu D 202 amu E 203 amu 48 A periodic law based on atomic masses would necessitate Te and I changing places in the periodic table This was not done in the early periodic table because A it was thought that the atomic masses might be in error B iodine contains one naturally occurring isotope, whereas tellurium consists of several isotopes C a periodic law based on atomic masses is not valid D the tellurium samples could contain a heavy impurity E iodine behaves chemically like chlorine and bromine 49 The elements in a row of the periodic table are known as A a family B a group C metals D metalloids E a period 50 All of the following statements about different elements are true except A Potassium is an alkali metal B Aluminum is a transition element C Barium is an alkaline earth metal D Fluorine is a halogen E Helium is a noble gas 10

37 51 Which of the following statements is not true about the element nickel? A It is in group VIIIB (group 10) B It is a metal C It is in period 4 D It tends to form anions E It is a transition metal 52 The elements in this group are termed alkali metals A Group 1A B Group 2A C Group 3A D Group 4A E Group 5A 53 Choose the group containing the most reactive nonmetals A Group 1A B Group 3A C Group 5A D Group 7A E Group 8A 54 Which element belongs to the halogen group? A bromine B magnesium C oxygen D lithium E nitrogen 55 Which of the following statements about different elements are true? 1 As is a metalloid and Se is a nonmetal 2 Cu is a transition element and Ge is a metalloid 3 Both F and I are halogens A 1 only B 2 only C 3 only D 1 and 2 only E 1, 2, and 3 56 Which of the following is a metalloid? A carbon B oxygen C hydrogen D copper E silicon 57 All of the following elements are best classified as metalloids except A B B Si C Ga D As E Te 11

38 58 Which of the following models best represents the ammonia molecule, NH 3? A B C D E None of these could represent NH 3 59 In a particular mass of KAu(CN, there are atoms of gold What is the total number of atoms in this sample? A B C D E A sample of TNT, C 7 H 5 N 3 O 6, has nitrogen atoms How many hydrogen atoms are there in this sample of TNT? A B C D E A 15-g sample of washing soda, Na 2 CO 3 10H 2 O, has carbon atoms How many oxygen atoms are present in 15 g of washing soda? A B C D E 62 A sample of the mineral troegerite, (UO 2 (AsO 4 12H 2 O, has U atoms How many arsenic atoms are present in this sample of troegerite? A B C D E

39 63 An ion is formed A by either adding protons to or subtracting protons from the atom B by either adding electrons to or subtracting electrons from the atom C by either adding neutrons to or subtracting neutrons from the atom D All of the above are true E Two of the above are true 64 The species Na +, Mg 2+, and Al 3+ are all A anions B cations C isotopes D isoelectronic E allotropes 65 The species that is formed when a molecule gains an electron is called A an anion B a cation C an isotope D a charge mass ratio E an isomer 66 Which of the following statements is true about one formula unit of MgCl 2? A It is composed of one Mg atom and one Cl 2 molecule B It is composed of one MgCl 2 molecule C It is composed of one Mg atom and two Cl atoms D It is composed of one Mg 2+ ion and two Cl ions E It is composed of one Mg 2+ ion and one Cl 2 2 ion 67 Chemical reactions between nonmetals and nonmetals primarily involve A interactions between protons B interactions between protons and electrons C interactions among protons, electrons, and neutrons D transfer of electrons E sharing of electrons 68 Which of the following is an ionic compound? A CH 3 OH B HOClO C NH 4 CN D NH 3 E N 2 O 3 69 The formula of water, H 2 O, suggests A there is twice as much mass of hydrogen as oxygen in each molecule B there are two hydrogen atoms and one oxygen atom per water molecule C there is twice as much mass of oxygen as of hydrogen in each molecule D there are two oxygen atoms and one hydrogen atom per water molecule E none of these 13

40 70 How many oxygen atoms are there in a formula unit of UO 2 (C 2 H 3 O 2 NH 4 C 2 H 3 O 2 2H 2 O? A 4 B 8 C 17 D 10 E 6 71 What is the ratio of oxygen atoms to hydrogen atoms in the compound Fe 4 (PO 4 (OH 12H 2 O? A 15:3 B 27:15 C 27:27 D 18:27 E 25:17 72 What is the ratio of oxygen atoms to hydrogen atoms in the mineral carnotite, K 2 (UO 2 (VO 4 3H2O? A 8:3 B 8:6 C 9:6 D 17:3 E 17:6 73 Which statement is incorrect concerning the formation of ionic compounds? A Metals tend to form cations, while nonmetals tend to form anions B Alkali metals tend to form cations with a charge of +1 C Transition metals tend to form cations with a charge of +3 D Halogens tend to form anions with a charge of 1 E Noble gases tend not to form ionic compounds 74 The empirical formula of a salt consisting of Ca 2+ and Cl ions is A CaCl B Ca 2 Cl 3 C CaCl 2 D Ca 2+ Cl E Ca 2 Cl 75 What is the formula for the binary compound formed between Al 3+ and Se 2 ions? A AlSe B Al 2 Se C Al 2 Se 3 D Al 3 Se 2 E AlSe 3 76 Which of the following molecules is a hydrocarbon? A CH 3 OCH 3 B C 6 H 12 O 6 C CH 3 CH 2 CH 3 D CH 3 CH 2 OH E H 2 O 14

41 77 Which of the following molecules contains the ether functional group? A CH 3 CH 2 OCH 2 CH 3 B CH 3 CH 2 OH C H 2 O D CH 3 CH 2 COOH E CH 3 CH 2 NH 2 78 Which of the following molecules contains the carboxylic acid functional group? A CH 3 NHCH 3 B CH 3 OCH 2 CH 3 C CH 3 CH 2 CH 2 OH D CH 3 CH 2 COCH 2 CH 3 E CH 3 CH 2 CH 2 COOH 79 Which of the following molecules contains the alcohol functional group? A CH 4 B CH 3 OCH 3 C CH 3 OH D C 6 H 6 E C 2 H 2 80 How many electrons does a barium ion have? A 2 B 8 C 54 D 56 E Which of the following statements is false? A A potassium ion has a total of 18 e B A sulfide ion has a total of 18 e C A sodium atom is most likely to ionize to form a cation of charge +1 D The charge on a neutral chlorine atom is zero E A crystal of calcium fluoride has equal numbers of calcium ions and fluoride ions 82 How many electrons does a aluminum ion have? A 28 B 24 C 14 D 13 E How many electrons does a chloride ion have? A 2 B 15 C 17 D 18 E 22 15

42 84 Which metals form cations with varying positive charges? A transition metals B Group 1 metals C Group 2 metals D Group 3 metals E metalloids 85 Which of the following represents a known ion? A Na B Sc 4+ C Sn 2+ D S 2+ E P 4 86 The formula for the sulfide ion is A S 2 B S 2 O 3 2 C SO 3 2 D SO 4 2 E HSO 4 87 The correct name for Ca 2+ is A calcium B calcium(ii) ion C calcium ion D calcium(i) ion E monocalcium ion 88 The formula of the hypochlorite ion is A ClO B ClO 2 C Cl 2 O 3 D ClO 3 E CN 89 The name of the SO 4 2 ion is A persulfate B sulfite C thiosulfite D sulfate E sulfide 90 The formulas of the nitrite, phosphate, and nitrate ions are represented, respectively, as A NO 2, PO4 3, NO3 B N 3, PO 3 3, NO3 C NO, P 5, NO 3 D NO 2, P 3, NO3 E NO 3, PO2, N 3 16

43 91 The formulas of the hydroxide ion, the nitrate ion, and the phosphate ion are represented, respectively, as A OH, NO 3, PO4 3 B H, NO 2, P 3 C H, NO 3, P 3 D OH, NO 2, PO3 3 E OH, NO 2, PO All the following ions have the same charge except A sulfide B sulfite C sulfate D chlorate E dichromate 93 All the following ions have the same charge except A oxalate B permanganate C oxide D peroxide E monohydrogen phosphate 94 The formulas of the carbonate ion, the ammonium ion, and the chlorate ion are represented, respectively, as A CO 3 2, NH2, ClO3 B CO 3 2, NH3 +, ClO2 C CO 2, NH4 +, ClO D CO 3 2, NH4 +, ClO3 E P 3, NH 3 +, ClO2 95 The systematic name for BaH 2 is A barium dihydrogen B barium dihydride C barium(ii) hydrate D barium dihydrate E barium hydride 96 What is the name of the compound whose formula is Al 2 (SO 4? A aluminum sulfide B aluminum sulfite C aluminum sulfate D aluminum persulfate E dialuminum tri(sulfur tetraoxygen) 97 The correct name for FeO is A iron oxide B iron(ii) oxide C iron(iii) oxide D iron monoxide E iron(i) oxide 17

44 98 What is the formula for the chloride of praseodymium(iii)? A Pr 3 Cl B PrCl 3 C Pr 2 (ClO 2 D Pr(ClO 4 E Pr(ClO 3 99 The correct formula for gallium oxide is A GaO B Ga 2 O C GaO 2 D Ga 2 O 3 E Ga 3 O What is the formula for calcium nitride? A Ca 3 N 2 B Ca 2 N 3 C CaNO 2 D Ca(NO 2 E Ca(NO The formula of calcium sulfide is A CaS B CaSO 2 C CaSO 4 D CaSO 3 E Ca(SO What is the formula of magnesium nitrite? A Mg 3 N 2 B Mg 2 N 3 C Mg(NO 2 D Mg(NO 2 E Mg 2 (NO The formula for aluminum chloride is A AlC B AlCl C Al 2 Cl 3 D AlCl 2 E AlCl The chemical formula for iron(iii) sulfide is A Fe 2 (SO 3 B Fe 2 (SO 4 C Fe 2 S 3 D Fe 3 (SO 3 E Fe 3 (SO 4 18

45 105 The formula for aluminum sulfate is A Al 3 (SO 4 B Al 2 (SO 4 C Al 2 (SO 3 D Al 3 S 2 E Al 2 S The formula for copper(ii) phosphate is A CuPO 4 B Cu 3 (PO 4 C Co 2 (PO 4 D Cu 2 (PO 4 E Co 3 (PO Choose the name formula pair that does not match A sodium sulfite, Na 2 SO 3 B calcium fluoride, CaF 2 C potassium permanganate, K 2 MnO 4 D aluminum oxide, Al 2 O 3 E iron(iii) oxide, Fe 2 O Choose the name formula pair that does not match A ammonium hydrogen carbonate, NH 4 CO 3 B sodium chlorite, NaClO 2 C calcium hydride, CaH 2 D nitric acid, HNO 3 E calcium hydroxide, Ca(OH 109 The formula for aluminum bromide is A ABr B AlBr C AlBr 2 D AlBr 3 E AlBr The formula for potassium carbonate is A P 2 CO 3 B K 2 CO 3 C Po 2 CO 3 D P 2 C E K 2 C 111 The formula for magnesium nitride is A MgN B MgNO 2 C Mg 2 N 3 D Mg(NO 2 E Mg 3 N 2 19

46 112 What is the subscript of potassium in the formula for potassium sulfate? A 1 B 2 C 3 D 4 E What is the formula for sodium peroxide? A NaO B Na 2 O C NaO 2 D Na 2 O 2 E Na 3 O What is the formula for the chlorate of praseodymium(iii)? A PrCl 2 B PrCl 3 C Pr 2 (ClO 3 D Pr(ClO 4 E Pr(ClO What is the formula for the nitride of samarium(iii)? A Sm 2 N 3 B Sm(NO 3 C Sm(NO 2 D Sm(NO 3 E SmN 116 The correct name for LiCl is A lithium monochloride B lithium(i) chloride C monolithium chloride D lithium chloride E monolithium monochloride 117 The chemical name for the model is A nitric oxide B nitrogen oxide C nitrogen trioxide D nitrogen tetroxide E dinitrogen tetroxide 118 The formula for perchloric acid is A HClO B HClO 4 C HClO 2 D HClO 3 E HCl 20

47 119 Which name formula pair is incorrect? A H 2 SO 3, sulfurous acid B HClO 2, chlorous acid C H 2 CO 3, carbonic acid D HBr, hydrobromic acid E H 3 P, phosphoric acid 120 Which name formula pair is incorrect? A magnesium sulfate heptahydrate, MgSO 4 7H 2 O B strontium nitride, Sr 3 N 2 C titanium(iv) carbide, TiC D dinitrogen tetroxide, N 2 O 4 E hypochlorous acid, HClO The oxoanion that comes from nitrous acid is A NO B NO 2 C NO 3 D N 2 O 3 E HNO For the following balanced chemical equation, which substance represents the catalyst? 2CO(g) + 2NO(gCO 2 (g) + N 2 (g) A CO(g) B NO(g) C Rh(s) D CO 2 (g) E N 2 (g) 123 What is the balanced chemical equation that represents the following reaction? A 6H + 2N 2NH 3 B 3H 2 + N 2 2NH 3 C 2N + 2H 3 2H 3 N D 6H + 2N 2N 3 H E 6H + 2N 2HN In the following chemical equation, what is the reactant? CuSO 4 5H 2 O(s) CuO(s) + SO 3 (g) + 5H 2 O(l) A CuSO 4 (s) B CuSO 4 5H 2 O(s) C CuO(s) D SO 3 (g) E H 2 O(l) 21

48 125 Which is a correct balanced chemical equation corresponding to the following description of a chemical reaction? Hydrochloric acid reacts with magnesium metal to produce aqueous magnesium chloride and hydrogen gas A HCl(aq) + Mg(s) MgCl(aq) + H(g) B 2HCl(aq) + Mg(s) MgCl(aq) + H 2 (g) C 2HCl(aq) + Mg(aq) MgCl 2 (s) + H 2 (g) D 2HCl(aq) + Mg(s) MgCl 2 (aq) + 2H(g) E 2HCl(aq) + Mg(s) MgCl 2 (aq) + H 2 (g) 126 Which is a correct balanced chemical equation corresponding to the following description of a chemical reaction? Sulfuric acid reacts with aqueous sodium hydroxide to produce aqueous sodium sulfate and water A H 2 S(aq) + NaOH(aq) NaS(aq) + H 2 O(l) B H 2 SO 4 (aq) + 2NaOH(aq) Na 2 SO 4 (aq) + 2H 2 O(l) C H 2 S(aq) + 2NaOH(aq) Na 2 S(aq) + 2H 2 O(l) D H 2 SO 4 (aq) + NaOH(aq) NaSO 4 (aq) + H 2 O(l) E H 2 SO 4 (aq) + 2NaOH(aq) Na 2 S(aq) + 2H 2 O(l) + 2O 2 (g) 127 How many of the following statements are true concerning chemical equations? I Coefficients can be fractions II Subscripts can be fractions III Coefficients represent the relative masses of the reactants and/or products IV Changing the subscripts to balance an equation can be done only once V Atoms are conserved when balancing chemical equations A 1 B 2 C 3 D 4 E When the following equation is balanced with lowest whole-number coefficients, what is the coefficient for NO(g)? NH 3 (g) + O 2 (g) NO(g) + H 2 O(g) A 1 B 2 C 3 D 4 E The complete combustion of heptane, C 7 H 16, yields carbon dioxide and water: The smallest whole-number coefficient of oxygen in the balanced equation is A 9 B 10 C 11 D 12 E 13 22

49 130 The complete combustion of hexane, C 6 H 14, yields carbon dioxide and water: The smallest whole-number coefficient of oxygen in the balanced equation is A 16 B 17 C 18 D 19 E The products of the combustion of acetaldehyde with oxygen are shown in the following equation: CH 3 CHO + O 2 CO 2 + H 2 O When properly balanced, the equation indicates that molecules of O 2 are required to burn 2 molecules of CH 3 CHO A 2 B 3 C 4 D 5 E Energy from the following reaction provided the lift for the moon lander: (CH 3 N 2 H 2 + N 2 O 4 N 2 + H 2 O + CO 2 When the equation is balanced, the smallest whole-number coefficient of nitrogen is A 1 B 2 C 3 D 4 E Treatment of sodium borohydride with sulfuric acid is a convenient method for the preparation of diborane: NaBH 4 + H 2 SO 4 B 2 H 6 + H 2 + Na 2 SO 4 When the equation is balanced, the coefficient for hydrogen is A 1 B 2 C 3 D 4 E All the following may change during a chemical reaction except A the total number of atoms in the system B the temperature of the system C the density of the system D the total number of molecules in the system E the total volume of the system 23

50 135 The complete combustion of phenylhydrazine, C 6 H 5 NHNH 2, with the oxidizer dinitrogen tetraoxide is shown in the following equation: C 6 H 5 NHNH 2 + N 2 O 4 CO 2 + H 2 O + N 2 When this equation is balanced, the sum of all the coefficients (using smallest whole numbers) is A 10 B 15 C 20 D 25 E The complete combustion of pentane yields carbon dioxide and water When the equation C 5 H 12 (l) + O 2 (g) CO 2 (g) + H 2 O(l) is balanced, the ratio of the coefficient of CO 2 to the coefficient of O 2 is A 5:8 B 8:5 C 5:6 D 6:5 E 8:6 137 A reaction occurs between sodium carbonate and hydrochloric acid, producing sodium chloride, carbon dioxide, and water Which is the correct set of coefficients, respectively, for the balanced reaction? A B C D E none of these 138 When the equation (CH 3 NNH 2 + N 2 O 4 N 2 + H 2 O + CO 2 is balanced, the sum of all the coefficients (simplest whole number) is A 9 B 10 C 11 D 12 E When the equation C 5 H 6 N 2 OS(s) + O 2 (g) CO 2 (g) + H 2 O(l) + N 2 (g) + SO 2 (g) is balanced, the sum of all the coefficients (simplest whole number) is A 18 B 19 C 20 D 21 E 24 24

51 140 Ammonia can be made by reaction of water with magnesium nitride: Mg 3 N 2 (s) + H 2 O(l) Mg(OH (s) + NH 3 (g) When the equation is properly balanced, the sum of the coefficients is A 6 B 8 C 9 D 12 E Which one of the following equations is properly balanced? A NH 4 NO 3 2H 2 O + N 2 B CH 3 CHO + 3O 2 2CO 2 + 2H 2 O C Sn + 4HNO 3 SnO 2 + 4NO 2 + 2H 2 O D 2Na 2 SO 4 + 3Bi(NO 3 Bi 2 (SO 4 + 9NaNO 3 E Na 2 CO 3 + 2H 2 SO 4 Na 2 SO 4 + 2H 2 O + CO All of the following equations are balanced except A (NH 4 Cr 2 O 7 N 2 O + Cr 2 O 3 + 4H 2 O B 2NH 4 SCN + Ba(OH 8H 2 O 2NH H 2 O + Ba(SCN C C 12 H 22 O 11 12C + 11H 2 O D NH 4 NO 3 N 2 O + 2H 2 O E 2Mg + CO 2 2MgO + C 143 Which of the following equations is not balanced? A 2NaCl + Pb(NO 3 PbCl 2 + 2NaNO 3 B Fe 3 O 4 + 3CO 3Fe + 3CO 2 C (NH 4 Cr 2 O 7 N 2 + 4H 2 O + Cr 2 O 3 D 2Sb 2 OS O 2 2Sb 2 O 5 + 4SO 3 E C 12 H 22 O O 2 12CO H 2 O 25