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level: 12/28/2020

Questions and Answers List

level questions: 12/28/2020

Question	Answer
Given reaction N2 + 3H2  2NH3, you mix 1 mol each of nitrogen and hydrogen gases under the same conditions in a container fitted with a piston. Calculate the ratio of volumes of the container (Vfinal/Vinitial). A) 0.67 B) 1.00 C) 1.33 D) 1.50 E) none of these	A KEY: Chemistry \| general chemistry \| phases \| gas \| ideal gas law \| stoichiometry and gas volumes
As indicated by Lewis structures, which of the following species could probably not exist as a stable molecule? A) NH3 B) N2H2 C) N2H4 D) N2H6 E) N2O4	ANS: D PTS: 1 DIF: Moderate REF: 8.11 KEY: Chemistry \| general chemistry \| bonding \| covalent bonding \| exceptions to the octet rule
Which item (a, b or c) in each of the three groups below has the lowest entropy? I. (a) 10 g ice (b) 10 g water vapor (c) 10 g liquid water II. (a) 1 mole NaCl solid (b) 1 mol NaCl in 1 M aqueous solution (c) 1 mol molten NaCl III. (a) 1 mole C2H6(g), (b) 1 mole CH4(g), (c) 1 mol C3H8(g) all at 25 C and 1 atm A) a, a, b B) c, b, c C) b, b, c D) a, b, c E) a, a, c	ANS: A PTS: 1 DIF: Easy REF: 17.5 KEY: Chemistry \| general chemistry \| thermochemistry \| thermodynamics \| second law of thermodynamics \| entropy
A 0.186 M solution of the salt NaA has a pH of 8.40. Calculate the Ka value of the acid HA. A) 3.410–11 B) 7.4 10–10 C) 2.9 10–4 D) 1.2 102 E) none of these	ANS: C PTS: 1 DIF: Moderate REF: 14.8 KEY: Chemistry \| general chemistry \| acids and bases \| solutions of a weak acid or base \| acid-base properties of salt solutions MSC: Quantitative
What is the hybridization of the carbon atom that is double-bonded to oxygen? A) sp B) sp2 C) sp3 D) dsp3 E) d2sp3	ANS: B PTS: 1 DIF: Easy REF: 9.1 KEY: Chemistry \| general chemistry \| bonding \| bonding theories \| hybridization MSC: Conceptual