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level: 1/7/2021

Questions and Answers List

level questions: 1/7/2021

QuestionAnswer
In which single flask do the molecules have the greatest mass, the greatest average velocity, and the highest kinetic energy? A) Flask A B) Flask B C) Flask C D) All are the same. E) No one flask has all these.ANS: E PTS: 1 DIF: Moderate REF: 5.6 KEY: Chemistry | general chemistry | phases | gas | kinetic-molecular theory MSC: Conceptual
A 20.0-g sample of methyl alcohol (CH3OH, molar mass = 32.04 g/mol) was dissolved in 43.3 g of water. The mole fraction of CH3OH is: A) 0.260 B) 0.624 C) 0.316 D) 4.85 E) 0.206ANS: E PTS: 1 DIF: Easy REF: 11.1 KEY: Chemistry | general chemistry | solutions | expressing concentration | mole fraction MSC: Quantitative
Determine the initial rate of B consumption ([B]/t) for the first trial? A) 8.00  10–3 mol/L·s B) 1.60  10–2 mol/L·s C) 3.20  10–2 mol/L·s D) 4.00  10–3 mol/L·s E) none of these (A-D)ANS: B PTS: 1 DIF: Moderate REF: 12.3 KEY: Chemistry | general chemistry | rates of reaction | reaction rate | change of concentration with time
A solution contains 0.500 M HA (Ka = 1.0  10–8) and 0.432 M NaA. What is the [H+] after 0.10 mole of HCl is added to 1.00 L of this solution? A) 1.0 *10^–8 M B) 3.0 * 10^–8 M C) 5.5 * 10^21 M D) 1.8 * 10^–8 M E) none of theseANS: D PTS: 1 DIF: Moderate REF: 15.2 KEY: Chemistry | general chemistry | acids and bases | solutions of a weak acid or base with another solute | buffer | adding an acid or base to a buffer
The solubility of silver phosphate, Ag3PO4, at 25°C is 1.55*10–5 mol/L. Determine the concentration of the Ag+ ion in a saturated solution. A) 1.55 * 10^-5 M B) 5.17 *10^-6 M C) 4.65 *10^-5 M D) 1.94 * 10^5 M E) 3.72 * 10^-15 MANS: C PTS: 1 DIF: Easy REF: 16.1 KEY: Chemistry | general chemistry | solubility | solubility equilibria | solubility product constant