PQ Answer Key - 50-POINT PARTNER QUIZ! You may work with...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
50-POINT PARTNER QUIZ! You may work with only the person assigned to you. No notes allowed! Carefully bubble your answer choices on the Scantron, as only it will be graded. Each question is worth 2 points. 1. What factors must be equal in a reversible chemical reaction at equilibrium? a. The concentrations of the reactants and products b. The potential energies of the reactants and products c. The activation energies of the forward and reverse reactions d. The rates of reaction of the forward and reverse reactions Definition of equilibrium – rates are equal 2. Based on the nature of the reactants in each of the equations below, which reaction at 25 o C will occur at the fastest rate? a. C (s) + O 2 (g) CO 2 (g) b. NaOH (aq) + HCl (aq) NaCl (aq) + H 2 O (l) c. CH 3 OH (l) + CH 3 COOH (l) CH 3 COOCH 3 (aq) + H 2 O (l) d. CaCO 3 (s) CaO (s) + CO 2 (g) Solutions of aqueous ions will react fastest because the bonds break as soon as the ionic salt is dissolved in water. 3. A solution in which equilibrium exists between undissolved and dissolved solute is always a. Saturated b. Dilute c. Unsaturated d. Supersaturated This is the only type of solution where the rate of precipitation will equal the rate of dissolving. 4. Give this system at equilibrium: PbCl 2 (s) Pb 2+ (aq) + 2Cl - (aq) When KCl (s) is added to the system, the equilibrium shifts to the a. Right, and the concentration of Pb 2+ (aq) ions decreases b. Right, and the concentration of Pb 2+ (aq) ions increases c. Left, and the concentration of Pb 2+ (aq) ions decreases d. Left, and the concentration of Pb 2+ (aq) ions increases Common ion effect – Adding KCl increases the concentration of Cl - ions. The system will shift to remove these ions.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/01/2012 for the course CHEM 101 taught by Professor Donahue during the Spring '11 term at Long Island U..

Page1 / 3

PQ Answer Key - 50-POINT PARTNER QUIZ! You may work with...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online