HonorsChemistry 2nd Semester Review MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

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1 Exam Name HonorsChemistry 2nd Semester Review MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Which process releases energy? 1) A) bond formation B) bond breaking C) both A and B D) none of the above 2) Which process absorbs energy? 2) A) bond breaking B) bond formation C) both A and B D) none of the above 3) Which of the following equations has 1:2:1:1 as the coefficient ratio when balanced? 3) A) CH4 + O2 CO2 + H2O B) H2SO4 + KOH K2SO4 + H2O C) NaOH + HCl NaCl + H2O D) Zn + HCl H2 + ZnCl2 4) Which of the following balanced reactions does not have at least one 6 as a coefficient? 4) A) C6H12O6 + O2 CO2 + H2O B) H2SO4 + Al(OH)3 Al2(SO4)3 + H2O C) C2H2 + O2 CO2 + H2O D) H3PO4 + Ba(OH)2 Ba3(PO4)2 + H2O 5) What is the sum of all coefficients after the following equation is balanced? C8H18 + O2 CO2 + H2O A) 18 B) 4 C) 32 D) 61 5) 6) Which of the following reactions is a decomposition reaction? 6) A) HCl + NaOH NaCl + H2O B) CaCl2 + H2O CaCl2 2H2O C) Mg + HCl H2 + MgCl2 D) KClO3 KCl + O2 7) The following equation is an example of a reaction. Zn + CuCl2 Cu + ZnCl2 A) decomposition B) double replacement C) single replacement D) combination 7) 8) Which of the following equations is not a double replacement reaction? 8) A) Mg + HCl H2 + MgCl2 B) AlCl3 + H2O Al(OH)3 + HCl C) AgNO3 + NaCl AgCl + NaNO3 D) H2SO4 + Mg(OH)2 H2O + MgSO4 9) The spectator ions in the following precipitation equation are. AgNO3 + NaCl AgCl + NaNO3 A) Na+ and Cl- B) Ag+ and NO3 - C) Ag+ and Cl- D) Na+ and NO3-9) 10) Which of the following salts is insoluble in water? 10) A) K2SO4 B) Na3PO4 C) AgNO3 D) CaCO3 1

2 11) Which hydroxide is insoluble in water? 11) A) barium hydroxide B) aluminum hydroxide C) sodium hydroxide D) calcium hydroxide 12) Which of the following equations is not a precipitation reaction? 12) A) MgCl2 + AgNO3 Mg(NO3)2 + AgCl B) Na2SO4 + CaCl2 CaSO4 + NaCl C) NaCl+ AgC2H3O2 AgCl + NaC2H3O2 D) NaOH + HCl NaCl + H2O 13) When aqueous solutions of sodium phosphate and calcium nitrite are mixed, the spectator ions are. A) calcium and phosphate B) sodium and nitrite C) sodium and phosphate D) calcium and nitrite 13) 14) It takes mole(s) of potassium hydroxide to neutralize moles of sulfuric acid. 14) A) 1; 2 B) 2; 1 C) 3; 1 D) 1; 1 15) What is the mass in grams of mole of a compound whose formula is C3H7O2? 15) A) g B) g C) g D) g 16) Which of the following has the greatest number of atoms? 16) A) Na2P2O3 B) K4Fe(CNO)6 C) (NH4)2Cr2O7 D) (NH4)3PO4 17) The correct sequence of decreasing number of atoms per formula unit in the following is. 17) A) Na3PO4 > (NH4)3PO4 > Na2P2O3 B) (NH4)3PO4 > Na3PO4 > Na2P2O3 C) (NH4)3PO4 > Na2P2O3 > Na3PO4 D) Na2P2O3 > Na3PO4 > (NH4)3PO4 18) The molar mass of a compound XClO3 is The molar mass (rounded to the nearest whole number) of X is, which is. A) 1; H B) 7; Li C) 23; Na D) 39; K 19) Alkanes have the general molecular formula CnH2n+2. Thus, when n = 1, the alkane is CH4, when n = 2, the alkane is C2H6 etc. If an alkane has a molar mass between 140 and 150, this alkane is. A) C11H24 B) C12H26 C) C9H20 D) C10H22 18) 19) 20) Which of the following contains the least number of atoms? 20) A) 3.0 moles water B) 3.0 moles N2O5 C) 12.0 moles silver D) 1.0 mole C6H14 21) A sample of oxygen gas that contains one-half of Avogadro's number of molecules has a mass of. A) 8.0 g B) 16.0 g C) 32.0 g D) 64.0 g 21) 22) Which contains more carbon? 22) A) 40 g carbon monoxide B) 24 g methane C) 140 g sodium carbonate D) 15 g octane, C8H18 2

3 23) Which has more ions 2.0 moles of Al2(SO4)3 or 3.0 moles of Na3PO4? 23) A) 3.0 moles of Na3PO4 B) 2.0 moles of Al2(SO4)3 C) There are equal number of ions in both ionic compounds. D) It cannot be determined based on the information given. 24) The maximum number of moles of water that can be produced from 0.5 moles of C3H8O is. 2 C3H8O + 9 O2 6 CO2 + 8 H2O A) 4 B) 2 C) 8 D) ) A compound has the following elemental composition: C = 58.8%, H= 13.8%, N = 27.4%. The empirical formula of this compound is. A) C5H14N2 B) C5H14N C) C5H10N2 D) C5H15N2 24) 25) 26) Which of the following has 8 electrons in the outer shell? 26) A) Ca2+ B) Cl+ C) Fe3+ D) S2+ 27) What is the oxidation state of chromium in the compound K2Cr2O7? 27) A) -1 B) +4 C) +7 D) +6 28) Identify the compound that contains bromine with a +3 oxidation state. 28) A) NaBrO B) NaBrO4 C) NaBrO2 D) NaBrO3 29) Which of the following is true for the following reaction? Cu + ZnCl2 CuCl2 + Zn A) Cu is oxidized. B) Zn+2 is reduced. C) Cu is a reducing agent. D) All of the above statements are correct. 29) 30) What is reduction? 30) A) loss of electrons B) gain of electrons C) increase in oxidation number D) two of the above 31) Identify the equation that has the greatest number of electrons transferred. 31) A) 2 Mg + O2 2 MgO B) NaClO2 NaClO4 C) NaClO NaClO2 D) CuCl CuCl2 32) Consult the EMF activity series and predict which of the following changes will occur if an iron nail is placed in an aqueous solution containing the (Sn2+) ion. A) Nothing at all will happen (no reaction). B) Iron will be oxidized. C) Tin will be further oxidized. D) Iron will be reduced. 32) 33) 0.15 atm is equal to. 1 atm = 760 torr. 33) A) 11.4 torr B) torr C) 114 torr D) torr 3

4 34) g of a gas occupy a volume of 124 ml at 120. C and 760. torr. The possible formula of the gas is. A) Cl2 B) CO2 C) CH4 D) O2 34) 35) Which statement is not true about an ideal gas? 35) A) Molecular collisions are elastic. B) Higher temperatures slow down the speed of the molecules. C) The intermolecular forces in gas molecules are very weak except when they collide. D) Ideal gas molecules travel in a straight line. 36) The density of hydrogen gas at STP is. 36) A) g/l B) g/ml C) g/l D) g/l 37) Which of the following solutions are possible? 37) A) The solvent is a liquid and the solute is a gas. B) Both the solvent and solute are liquids. C) Both the solvent and solute are solids. D) All of them are possible. 38) Which of the following statements is correct? 38) A) Solubility involves the statement "like dissolves like." B) Pressure usually increases the solubility of a gas in water. C) Temperature usually increases the solubility of a solid in water. D) All of the above statements are correct. 39) What is the molarity of 3.68 ml of a solution containing moles of calcium chloride? 39) A) 0.68 M B) M C) 1.5 M D) M 40) How many grams of water are in 100 g of a 30 percent-by-mass sugar solution? 40) A) 70 g B) 100 g C) 60 g D) 30 g 41) A g sample of an acid, HA, was neutralized by 34.7 ml of M NaOH solution. The molecular mass of the acid is. A) 92 B) 61 C) 122 D) ) 42) Which of the following is endothermic? 42) A) dry ice formed from carbon dioxide B) condensing water vapor C) melting ice D) freezing water 43) The energy of activation may be affected by. 43) A) the presence of a catalyst B) decreasing the concentration of the reactants C) increasing the concentration of the reactants D) higher temperature 4

5 44) In a catalyzed reaction the activation energy is when compared to the uncatalyzed reaction. A) less B) identical C) more D) either less or more depending on the reaction 45) In each of the following diagrams, the x-axis is the reaction coordinate and the y-axis is the potential energy. Which diagram corresponds to a reaction that has an activation energy of 35 kj and an overall reaction energy of -110 kj? A) 44) 45) B) 5

6 C) D) 46) In the diagram above, the two containers shown (Box A and Box B) have exactly the same size (volume), are held at the same temperature, and contain the same reactant molecules (dots). In which box will the rate of reaction be faster? A) Box A B) Box B C) The rate will be about the same in each box. D) There is no way to tell which will be faster from this diagram. 46) 6

7 47) This factor depends on concentration and can be manipulated. 47) A) the fraction of collisions with the proper orientation B) the total number of collisions that occur per unit time C) the fraction of collisions with energy larger than the energy of activation D) All of the above are correct. 48) The rate of a reaction may be increased by. 48) A) increasing the concentration of reactants B) adding a catalyst C) increasing the temperature D) all of the above 49) Which of the following factors could increase the reaction rate? 2A + B2 2AB I. decreasing the temperature II. adding a catalyst III. increasing the surface area of solid reactants A) I and II B) I, II, and III C) I and III D) II and III E) III only 49) 50) Which of the following acids can produce only one H3O+ ion per molecule of acid when dissolved in water, although itself has other non-ionizable hydrogens? A) acetic acid B) hydrobromic acid C) sulfurous acid D) hypochlorous acid 50) 51) Which of the following acids is a triprotic acid when dissolved in water? 51) A) sulfuric acid B) hypochlorous acid C) phosphoric acid D) hydrobromic acid 52) Which of the following acids is the strongest acid? 52) A) hypochlorous acid, Ka = B) acetic acid, Ka = C) hydrogen peroxide, Ka = D) nitrous acid, Ka = ) Which of the following bases produces two OH- ions per formula unit of base when dissolved in water? A) calcium hydroxide B) ammonia C) potassium hydroxide D) aluminum hydroxide 53) 54) The conjugate acid of HCO3 - is. 54) A) CO2 2- B) H2CO3 C) CO3 2- D) H3CO3-55) The ph of an aqueous solution is What is the poh? (ph + poh = 14 for aqueous acid/base systems). A) 4.65 B) C) D) ) 7

8 Answer Key Testname: HONORS CHEMISTRY 2ND SEMESTER REVIEW 1) A 2) A 3) D 4) C 5) D 6) D 7) C 8) A 9) D 10) D 11) B 12) D 13) B 14) B 15) C 16) B 17) B 18) C 19) D 20) A 21) B 22) B 23) A 24) B 25) A 26) A 27) D 28) C 29) D 30) B 31) B 32) B 33) C 34) D 35) B 36) A 37) D 38) D 39) A 40) A 41) C 42) C 43) A 44) A 45) A 46) B 47) B 48) D 49) D 50) A 8

9 Answer Key Testname: HONORS CHEMISTRY 2ND SEMESTER REVIEW 51) C 52) D 53) A 54) B 55) A 9