iple Choice the choice that best completes the statement or answers the question
ID: 1074299 • Letter: I
Question
iple Choice the choice that best completes the statement or answers the question 28 marks 1. Which of the following statements are TRUE? a. Dynamic equilibrium occurs when the rate of the forward reaction equals the rate of the reverse reaction. The equilibrium constant for the forward reaction is equal to the equilibrium constant for the reverse reaction. A reaction quotient (Q) larger than the equilibrium constant (K) means that the reaction will favor the production of more products b. c. d. Dynamic equilibrium indicates that the amount of reactants and products are equal. e. All of the above are true. 2. A system has reached chemical equilibrium. Which is true of the system? a. b. c. d. e. there is no net change in the concentration of reactants or products the molecules have stopped combining and decomposing the system is open there is no change taking place All of the above are true 3. Two substances are mixed together in a flask. They undergo a reaction and reaches chemical equilibrium. Which statement is true? a. The flask now contains only the products in the reaction. b. The flask now contains only the reactants in the reaction. c. The flask now contains both the reactants and the products. d. The flask now contains neither the reactants nor the products. e. The contents of the flask cannot be determined. 4. In the equilibrium constant expression below, what do the exponents represent? Ku a. b. c. d. e. the concentrations of reactants and products the equilibrium constant the rates of the forward and reverse reactions the stoichiometric coefficients from the balanced equation none of these action will be the same, regardless of the initial concentrations, but the same, only if the environmental conditions remain the same. Why? a. The order of the reaction remains constant. b. The number of collisions remains constant, regardless of concentration. c. The reaction rate is constant. d. The product concentration will be similarly affected by increases or d 5. The equilibrium constant for a given creases in reactant concentration.Explanation / Answer
(1)
(a) True, because at equilibrium stage the conc of both reactants and products remains same
(b) False, because this occurs only when the system has attained equilibrium
(c) False, because when Q>K, the reaction tends to proceed in the reverse direction
(d) False, because at dynamic equilibrium, the conc of all species remains constant, but this does not mean that conc of reactants is equal to products.
(2)
Only statement (a) is True, because at equilibrium, the conc of all species remains same but since the equlibrium is dynamic it means both the forward and backward reactions occur but at exactly the same rate. The system is not open because none of the species are allowed to escape.
(3)
The only correct statement is (c), because both the reactants and the products are present, because the reaction is not irreversible which means there is an equilibrium point so this means forward and backward reactions both occur.
(4)
The exponents represent the stoichiometric coefficients of the species in the balanced chemical equation.
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