27 Co Cu Ni Rh Pd Ag Ir Au Pt Mt (268)
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1 Page 1 of 13 Chemistry 100 Exam 1 Version A October 21, 2002 I will not use multiple choice format as much as in this exam for Spring 2003! Name 1 H Li Na K Rb Cs Fr (223) 4 Be Mg Ca Sr Ba Ra Sc Y * La Ac Ti Zr Hf Rf (261) 23 V Nb Ta Db (262) 24 Cr Mo W Sg (263) 25 Mn Tc (99) 75 Re Bh (262) 26 Fe Ru Os Hs (265) 27 Co Rh Ir Mt (268) 28 Ni Pd Pt Cu Ag Au Zn Cd Hg B Al Ga In Tl C Si Ge Sn Pb N P As Sb Bi O S Se Te Po (209) F Cl Br I At (210) He Ne Ar Kr Xe Rn (222) * Lanthanide Series Actinide Series 58 Ce Th Pr Pa Nd U Pm (145) 93 Np Sm Pu (244) 63 Eu Am (243) 64 Gd Cm (247) 65 Tb Bk (247) 66 Dy Cf (251) 67 Ho Es (252) 68 Er Fm (257) 69 Tm Md (258) 70 Yb No (259) 71 Lu Lr (260) Information 1 lb = 454 g 1 in = 2.54 cm ρ=m/v PV=nRT, R= L atm/mol K C=k P as 1 oz = 28.3 g 1 gal = L 2.20 lb = 1 kg P A =x A P A C=5/9(F-32) HONClBrIF γ=j/m 2 η=kg/m s 1 cp = Pa s, 1 P = 0.1 Pa s K w=[h ][OH - ], ph=-log([h + ]) T f =-K f m T b=k b m ph=pka+log([a ]/[HA]) G=-nFE poh=-log([oh - ]) G=-RTln(K) G = H-T S K=C All multiple choice answers must be marked here! A A
2 Page 2 of 13 B B C C D D E E
3 Page 3 of (10 pts) Without referring to any periodic table (including the one on the front page of this exam, write the first 3 rows of the periodic table including element symbol and atomic number. You must sign and date the statement to get credit for this problem. I certify that I did not look at any reference while solving this problem. Signed: Date: 2. (10 pts) Write the correct Lewis structure for the following molecules and ions: A. ClO 4 - B. SO 2
4 Page 4 of 13 All multiple choice are 2 pts each. 3. Which of the following changes is/are endothermic for the underlined object? i. baking a potato ii. a person being burned by a pan iii. a wood log burning iv. a lit light bulb shining v. a person digesting food A. iii only B. iii and iv C. iii and iv D. i and iv E. i and ii 4. Which of the following are elements? i. KOH ii. Ne iii. CO iv. carbon tetrachloride v. calcium A. i, ii, and iii B. iv and v C. ii and iii D. ii and v E. ii, iii, and v 5. Sodium reacts with a component of the air, and the total mass of the reactants is equal to the total mass of the products. When freshly cut sodium metal is exposed to air, the mass of the substance increases. Which of the following is the best explanation for this apparent violation of the Law of Conservation of Mass? A. The air "pushes down" on the metal, causing the balance to display a falsely high mass B. The sodium atoms move closer to one another, causing the sample to gain mass C. The sodium reacts with a component of the air, and the total mass of the reactants is equal to the total mass of the products D. Thermal energy of the air is converted into the additional mass E. The Law of Conservation of Mass does not apply to metals
5 Page 5 of Which of the following correctly matches each sample with its classification as either macroscopic, microscopic, or particulate? Macroscopic Microscopic Particulate A. protein molecule cat hair crystal on polished metal B. protein molecule crystal on polished metal cat hair C. crystal on polished metal cat hair protein molecule D. cat hair crystal on polished metal protein molecule E. cat hair protein molecule crystal on polished metal 7. Which of the following is not a particulate sample of matter? A. An oxygen molecule B. A human egg cell C. An electron D. A nickel atom E. A hemoglobin molecule 8. Which of the following properties is/are classified as physical? i. the odor of glass cleaning solution ii. the color of chlorine gas iii. the electrical conductivity of copper wire iv. the ability of milk to sour v. a compound does not react with bromine A. i only B. ii only C. i and ii D. i, ii, and iii E. iv and v 9. Which of the following properties is/are classified as chemical? i. the taste of honey ii. the ability of hair to stretch iii. the corrosive character of hydrochloric acid iv. the combustibility of ethanol v. the softness of talc A. i and ii B. i, ii, and v C. iii only D. iv only E. iii and iv
6 Page 6 of Which of the following is a chemical property? A. Combustibility B. Boiling point C. Density D. Odor E. Taste 11. Which of the following substances is/are heterogeneous? i. gasoline ii. a gold bar iii. a freshly opened can of cola iv. potato chips v. a bacon strip A. i and ii B. iii, iv, and v C. i, iv, and v D. i, ii, and iv E. ii, iii, and v 12. In which of the following pairs of substances will there be a net attractive electrostatic force? A. Two positively charged table tennis balls B. A negatively charged piece of dust and a positively charged piece of dust C. A positively charged sodium ion and a positively charged potassium ion D. A negatively charged chloride ion and a negatively charged bromide ion E. Two negatively charged pith balls 13. Identify the product(s) that is/are (a) compound(s) in the equation Zn + CoCl 2 -> ZnCl 2 + Co A. CoCl 2 B. ZnCl 2 C. CoCl 2 and ZnCl 2 D. ZnCl 2 and Co E. Zn and CoCl 2
7 Page 7 of One of the main features of Dalton's atomic theory which is no longer considered valid is: All atoms of each element are identical in every respect. Which of the following is the ±best² explanation of why this feature is no longer considered valid? A. The existence of isotopes B. Mass is conserved in a chemical change C. Nearly all of the mass of an atom is concentrated in the nucleus D. The total charge of the electrons of an atom exactly balances the positive charge of the nucleus E. The planetary model of the atom has been shown to be incorrect 15. Which of the following statements is/are ±false²? i. Groups are arranged vertically in the periodic table ii. Periods are arranged horizontally in the periodic table iii. Periods are numbered from top to bottom iv. There are eight elements in the first period of the periodic table A. i only B. ii and iii C. i and ii D. iv only E. i, ii, and iv 16. Which of the following symbol/name pairs is/are correctly matched? i. Fl, Fluorine ii. N, Neon iii. S, Sodium iv. Ch, Chlorine v. H, Hydrogen A. i, ii, and v B. i, iii, and v C. i and v D. iv and v E. v only
8 Page 8 of Which of the three major subatomic particles has/have a charge of +1? i. electron ii. proton iii. neutron A. i only B. ii only C. iii only D. i and ii E. ii and iii 18. Which of the three major subatomic particles has/have a mass of approximately one amu? i. electron ii. proton iii. neutron A. i only B. ii only C. iii only D. i and ii E. ii and iii 19. Isotopes of an element vary in mass because of differing numbers of: A. Protons B. Neutrons C. Electrons D. Protons and neutrons E. Protons and electrons 20. Which of the following is correct? A. The element H is in both the first period and the seventh peridod B. The element Na is in Group 2A (2) C. The element Ge is in the fourth period and Group 4A (14) D. The element Cr is in the third period and Group 6B (6) E. More than one of the statements above are correct
9 Page 9 of Which of the following elements are correctly matched with their period and group? i. C first period Group 4A (4) ii. Ne second period Group 0 (18) iii. Al third period Group 3A (13) iv. Ca third period Group 2A (2) v. Br fourth period Group 0 (18) A. v only B. i, ii, iii, and iv C. ii, iii, and iv D. i, ii, and iii E. ii and iii 22. Which of the following is correct for the second period element in Group 5A (15)? Atomic Number Chemical Symbol Atomic Mass A. 38 Sr B. 15 P C P 15 D. 7 N E N Which of the following lists electron sublevels in order of increasing energy? A. 4p < 4d < 5s < 5p < 6s B. 4p < 5s < 4d < 5p < 6s C. 6s < 5p < 5s < 4d < 4p D. 6s < 5p < 4d < 5s < 4p E. 4p = 4d < 5s = 5p < 6s 24. Which of the following elements has the Lewis symbol below, where Sy represents the elemental symbol? Sy : A. Na B. Mg C. Al D. Si E. P
10 Page 10 of Which of the following statements is/are incorrect? i. For each value of n the number of sublevels is also ±n² ii. There is an s sublevel for every value of n iii. Some principal energy levels have no f sublevels iv. There is no d sublevel when n = 3 A. i only B. ii only C. iii only D. iv only E. ii and iv 26. Which of the following lists electron sublevels in order of increasing energy? A. 4p < 3d < 4s < 3p < 3s B. 4p < 4s < 3d < 3p < 3s C. 3s < 3p < 4s < 3d < 4p D. 3s < 3p < 3d < 4s < 4p E. 3s < 4s < 3p < 4p < 3d 27. What is the ground state electron configuration of carbon? A. 2s 2 2p 2 B. 1s 2 2s 2,2p 6,3s 2 C. 1s 2 1p 2 2s 2 D. 1s 2 2s 2 2p 2 E. none of the above is correct 28. Which of the following elements has the Lewis symbol below, where Sy represents the elemental symbol?.. Sy :. A. Li B. Mg C. Ga D. Sn E. P
11 Page 11 of Which of the following is the correct Lewis symbol for the given element? A. K: B. Kr: C. B: D. Be: E. O: 30. What do elements in a family or group of representative elements have in common? A. All have the same number of valence electrons B. All are in the same period C. All have eight valence electrons D. All have the same atomic number E. All are gases 31. Which general electron configuration is responsible for the family properties of noble gases? A. ns 1 B. ns 2 C. ns² np 2 D. ns² np 3 E. ns² np How many of the following elements belong to the chemical family known as the alkaline earths? sodium, magnesium, chlorine, neon, calcium, bromine, argon, fluorine, helium, hydrogen A. 1 B. 2 C. 3 D. 4 E 5
12 Page 12 of Which of the following ions is/are isoelectronic with Kr? i. Cl - ii. Br - iii. K + iv. Rb + v. Kr + A. v only B. i and ii C. ii and iv D. iii and iv E. iii, iv, and v 34. Which element will act as the positive pole in each of the following bonds: A. F in O-F and O in O-Cl B. O in O-F and O in O-Cl C. F in O-F and Cl in O-Cl D. O in O-F and Cl in O-Cl E. O, F, and Cl are all highly electronegative so there can be no positive pole 35. Which of the following is the best definition of ±cation²? A. A positively charged ion B. A negatively charged ion C. An ion formed from an element in the cathode chemical family D. A noble gas atom E. A monatomic isoelectronic configurative ion 36. How does a phosphorus atom achieve an octet of electrons? A. By losing 5 electrons B. By losing 3 electrons C. By gaining 8 electrons D. By gaining 5 electrons E. By gaining 3 electrons 37. The ratio of anions to cations in an ionic compound is always such that... A. the compound is reduced in size when compared to the parent atoms B. there are as many anions as there are cations C. the anions outnumber the cations D. the cations outnumber the anions E. the compound is electrically neutral
13 Page 13 of In a covalent bond, the valence electrons from atoms are... A. shared B. transferred to the less metallic element C. transferred to the more metallic element D. gained by the anion E. gained by the cation 39. A Lewis formula or Lewis diagram is used to show what? A. The physical properties of the compound B. How Lewisite can be made in the laboratory C. Whether a bond is polar or nonpolar D. How metals form alloys E. The arrangement of atoms and electrons in a molecule 40. What is a lone pair in a Lewis diagram? A. A bonding pair of electrons B. A shared pair of electrons C. A molecule with only two electrons D. An unshared pair of electrons E. The electrons that are not counted when determining if the octet of an atom has been satisfied 41. Which bond is completely nonpolar? A. F-F B. H-F C. C-N D. H-O E. C-H 42. In deciding whether a bond is polar or nonpolar, what has to be considered? A. The electromagnetic field surrounding the molecule B. Whether a magnet will attract the bonded atoms C. The electronegativity difference between the atoms D. The number of lone pairs E. The number of bonds between the two atoms
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