1) At equilibrium, ______. A) all chemical reactions have ... - Chemistry

CH1120Quiz#3-A/Chap-15/ 3 OctTest Form: A1) At equilibrium, __________.A) all chemical reactions have ceasedB) the rates of the forward and reverse reactions are equalC) the rate constants of the forward and reverse reactions are equalD) the value of the equilibrium constant is 1E) the limiting reagent has been consumed2) Which one of the following will change the value of an equilibrium constant?A) changing temperatureB) adding other substances that do not react with any of the species involved in the equilibriumC) varying the initial concentrations of reactantsD) varying the initial concentrations of productsE) changing the volume of the reaction vessel3) The relationship between the rate constants for the forward and reverse reactions and the equilibriumconstant for the process is K eq = __________.A) kfkrB) kf− krC) k f + krD) k f /krE) k r/kf4) The equilibrium constant for reaction 1 is K. The equilibrium constant for reaction 2 is __________.2KA)B) 2KC) 1/2K2D) 1/K2E) -K(1) SO 2 (g) + (1/2) O 2 (g) SO 3 (g)(2) 2SO 3 (g) 2SO 2 (g) + O 2 (g)5) Which of the following expressions is the correct equilibrium-constant expression for the equilibriumbetween dinitrogen tetroxide and nitrogen dioxide?N 2 O 4 (g)2NO 2 (g)[NO 2]A) −[N O ]2 42[NO 2]B)[N O ]2 4

[NO 2 ]C)[N O ]22 4D) 2 2 4E)[NO ][N O ]2[NO][NO]2 2 46) The expression for K p for the reaction below is __________.4CuO (s) + C H 4 (g)CO 2 (g) + 4Cu (s) + 2 H 2 O (g)PA) 4PCOCH P2H 22[Cu]PCO P2 HB)2O2[CuO]4P CHPCOP2 HC) 2 O2PCH 4PCOP2 HD) 2 O2PCuOPCH E) 4PH CO2O2P247) The equilibrium-constant expression for the reactionTi (s) + 2Cl2 (g)TiCl4 (l)is given byA)B)C)[TiCl4(l)][Ti(s)][Cl (g)][Ti (s)][Cl2(g)][TiCl4(l)][TiCl (l)][Cl24(g)]D) [Cl2 (g)]-2E)[TiCl24[Ti(s)][Cl2(l)]2(g)]228) How is the reaction quotient used to determine whether a system is at equilibrium?

A) The reaction quotient must be satisfied for equilibrium to be achieved.B) At equilibrium, the reaction quotient is undefined.C) The reaction is at equilibrium when Q < Keq.D) The reaction is at equilibrium when Q > Keq.E) The reaction is at equilibrium when Q = Keq.9) For the endothermic reactionCaCO3 (s)CaO (s) + CO 2 (g)Le Chätelier's principle predicts that __________ will result in an increase in the number of moles of CO 2 .A) increasing the temperatureB) decreasing the temperatureC) increasing the pressureD) removing some of the CaCO 3 (s)E) adding more CaCO 3 (s)10) The effect of a catalyst on an equilibrium is to __________.A) increase the rate of the forward reaction onlyB) increase the equilibrium constant so that products are favoredC) slow the reverse reaction onlyD) increase the rate at which equilibrium is achieved without changing the composition of the equilibriummixtureE) shift the equilibrium to the right

Quiz#3A:Answer Key1) B2) A3) D4) D5) B6) C7) D8) E9) A10) D