Name: _____________________ Lab Day/Time: _____________________ Lab Group Number: ____________________ CHM 116 Prelab Activity for Week 4 Investigation 34: ?What Factors Affect Chemical Equilibrium?? 2 Points Read Sections 15.1 and 15.7 in your textbook. In addition, you may want to review Chapter 5 with regards to ?H sign (+ / ?) as it relates to endothermic / exothermic reactions. Review Sample Exercise 15.13a, b, and e and do Exercise 15.51 a, b, and f. Which of the following statements regarding equilibrium is false? a. At equilibrium, the concentrations of the products and reactants do not change over time b. At equilibrium, the rate of the forward reaction and the rate of the reverse reaction are equal. c. At equilibrium, the concentration of reactant(s) may exceed the concentration of product(s). d. Equilibrium cannot be reached starting with only products. e. Equilibrium can be reached starting with only reactants. In your own words, state Le Châtelier?s Principle. Consider the following reaction at equilibrium CO(g) + 2 H2(g) ? CH3OH(g) ?H = ? 90.7 kJ Predict the shift in the reaction (left, right, or no change) as equilibrium is re-established following the changes listed in a ? d. a. CO(g) is removed from the reaction vessel _______________ b. CH3OH(g) is added _______________ c. H2(g) is added _______________ d. The temperature of reaction vessel is decreased _______________ Ionic compounds we normally designate as insoluble in water, e.g., AgCl(s), actually dissociate to a small extent into constituent ions. These aqueous ions are in equilibrium with the solid as indicated in the following equation. AgCl(s) ? Ag+(aq) + Cl?(aq) In a beaker of water containing solid silver chloride, indicate if the equilibrium components increase (?), decrease (?), or do not change (-) when a solution of NaCl is added to the beaker. Circle choice. Mass of AgCl(s) (?) (?) (-) Concentration of Ag+(aq) (?) (?) (-) Concentration of Cl?(aq) (?) (?) (-) Based on the description of the equilibrium reaction Fe3+(aq) + NCS?(aq) ? FeNCS2+(aq) in Investigation 34, what observation will be used to monitor a shift in the reaction and how does this relate to Le Châtelier?s Principle?
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