1. Which situation represents a system at equilibrium? a. Denitrifying bacteria are breaking down nitrates into nitrogen, and nitrifying bacteria are converting a woodland ecosystem. b. - Some of the apple juice in a closed jar is evaporating, but the volume of the juice in the jar remains constant. c. A solution of salt is unsaturated. d. The wax from a burning candle is melting and then solidifying away from the flame. e. An orange that is left in the Sun for a week dries out and turns brown. 2. A reaction quotient, Q, is calculated to be 3.2105. The equilibrium constant for the same reaction is 5.4105. Which statement is correct? a The system is at equilibrium. b The concentrations of the products are greater than their concentrations at equilibrium. c The system will attain equilibrium by moving to the right. d The system will attain equilibrium by moving to the left. e More information is needed to determine which statement is correct. 3. What will happen if hydrochloric acid is added to the following equilibrium system? H(m)+2CrO42Cr2O72(mq)+OH(aq)yelloworange a. The concentration of CrO42 will increase. b. The concentration of Cr2O72 will increase. c. The concentration of Hwill decrease. d. The solution will become more yellow. e. There will be no change to the equilibrium system. 4. Use Le Chtelier's principle to predict what will happen if the temperature of the following equilibrium system is decreased. The reaction in the forward direction is endothermic. Co(H2O)62(aq)+4Cl1(aq)pink a. The equilibrium will shift to the left. b. The equilibrium solution will become more purple. c. The equilibrium will shift to the right. d. The concentration of chloride ion will decrease. e. There will be no change