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F07 Self Assessment.pdf

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Department
Chemistry
Course
CHEM 1040
Professor
Lori Jones
Semester
Winter

Description
Fall 2007 Self-Assessment Quiz Question 1: Given the expression A/B = X/Y, then B is equal to a. XY/A (6.9%) b. AY/X (75.7%) c. X/AY (13.0%) d. Y/AX (4.4%) 2007 – 77% 4 2 -1 -1 Question 2: Given the expression K = [(a )(a )]/[(a)(a )], then K is equal to -6 8 4 6 a. a (65.5%) b. a (7.6%) c. a (5.6%) d. a (21.3%) 2007 – 64% Question 3: Given the expression y = 2.02 + 1.008 + 13.6 + 0.046, then the value of y, recorded with the correct number of significant figures is a. 16.67 (7.1%) b. 16.674 (9.0%) c. 16.7 (68.5%) d. 17 (15.4%) 70%–2007 Question 4: Given the expression, (63.8 × 10.04 × 2.1)/43.667, how many significant figures should y have? a. 2 (84.6%) b. 3 (10.6%) c. 4 (0.9%) d. 5 (3.8%) 2007 – 82% Question 5: Which of the following is a salt? a. SiO2(7.5%) b. NH 4l (66.0%) c. H2SO 412.3%) d. CCl 414.2%) 2007 – 68% Question 6: Which of the following is a base? a. MgSO (4.7%) b. CH 3H (16.6%) c. KNO (3.7%) d. Ca(OH) (72.0%) 79%–2007 Question 7: Which of the following is a strong acid? a. HNO (2.3%) b. H2SO 323.6%) c. HF (9.1%) d. HNO (63.0%) 57%–2007 Question 8: The formula of the carbonate ion is - 2- - - a. CO 3 (23.9%) b. CO 3 (68.2%) c. HCO 3 (4.1%) d. CO 2 (3.8%) 2007 – 69% 31 2+ Question 9: The species 15P contains a. 15 protons and 14 electrons. (13.9%) b. 16 neutrons and 16 electrons. (2.5%) c. 15 protons and 13 electrons. (60.8%) 2007 – 65% d. 15 neutrons and 16 electrons. (22.8%) Question 10: The reaction N O 2g)4↔ 2NO (g) h2s reached equilibrium. This means a. that the foward and reverse reactions are proceeding at equal rates. (92.0%) b. that all the 2O 4as been converted to NO . (2.9%) c. that none of the molecules in the system are capable of further chemical change. (5.7%) d. that the temperature of the reaction vessel is the sane as trhe outside temperature. (0.4%) REMOVED 2007 Department of Chemistry, University of Guelph New 2007 Question: Which equilibrium shifts to the right when the external pressure is decreased but shifts to the left when the reaction is cooled (i.e., decrease in temperature)? a. 4NH (3) + 5O (g)2↔ 4NO(g) + 6H O(g) + Hea2 22% b. 2NO (2) + Heat ↔ 2NO(g) + O (g) 2 42% c. PCl 3g) + Cl (2) + Heat ↔ PCl (g2 5 )0% d. CaO(s) + CO (g)2↔ CaCO (s) + Hea3 16% Question 11: In an exothermic reaction a. heat is given off and ∆H is negative. (74.3%) 2007 – 74% b. heat is given off and ∆H is positive. (23.9%) c. heat is absorbed and ∆H is negative. (1.1%) d. heat is absorbed and ∆H is positive. (0.5%) -1 Question 12: The molar heat of combustion of methane is -890 kJ.mol . From this information, we can conclude that when 0.50 mole of methane burns a. 445 kJ of heat are released (74.4%) 2007 – 74% b. 445 kJ of heat are absorbed (12.9%) c. 1780 kJ of heat are released (10.4%) d. 1780 kJ of heat are absorbed (2.3%) ***Question 13: For the reaction 2NO (g) 2 2NO(g) + O (g), the 2quilibrium constant is given by 2 2 a. ( [NO] + [O ]2)/[NO ] 230.3%) b. ( [NO] [O 2 )/ [NO 2 (6.0%) c. ( [2NO] + [O ] )/ 2[NO ] (16.8%) 2 2 22 d. ( [NO] [O2] )/ [NO 2 (46.8%) 2007 – 52% Question 14: What is the shape of the water molecule? a. angular (bent) (85.2%) 2007 – 89% b. linear (5.7%) c. pyramidal (5.9%) d. tetrahedral (3.2%) ***Question 15: What is the shape of a molecule in which the central atom is bonded to two hydrogen atoms and also has two lone (non-bonding) pairs of electrons? a. tetrahedral (16.4%) b. angular (bent) (52.8%) 2007 – 54% c. linear (12.8%) d. pyramidal (18.1%) Question 16: Which of these five K valaes would represent the weakest acid? -2 a. 2.1 × 10 (1.1%) b. 4.0 × 10-4 (6.8%) -1 c. 3.0 × 10 -7(24.1%) d. 1.0 × 10 (68.1%) 2007 – 71% Department of Chemistry, University of Guelph - 2 - Question 17: The percent by weight of iron in Fe 2O 3s (atomic weight: Fe 56, O 16 ) a. 23% (3.1%) b. 40% (6.9%) c. 67% (11.5%) d. 70% (78.5%) 2007 – 79% Question 18: The isotope boron-11 (atomic number 5) has _____ electrons. Answer: 5 (72.8%) REMOVED 2007 2 2 6 2 3 New 2007 Question 18: Which element has the electron configuration 1s 2s 2p 3s 3p ? a. N b. P c. Cl d. As e. Ar (3.5%) (82.3%) 4.7% 6.3% 3.2% Question 19: The isotope Boron -11(atomic number 5 ) has _____ neutrons. Answer: 6 (59.3%) 2007 – 56% Question 20: The isotope boron -11 (atomic number 5 ) has _____ protons. Answer: 5 (83.4%) REMOVED 2007 New 2007 Question 20: Which element has t
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