1) Identify the labels (a) and (b) on the graph. a) a is concentration of reactants and b is the concentration of product b) a is the volume of reactants and b is the volume of product c) a is concentration of product and b is the concentration of reactant d) a the mass of reactants and b is the mass of product 2) 15.00 g of solid ammonium hydrogen sulfide is introduced into a 500.-mL flask at 25°C, the flask is sealed, and the system is allowed to reach equilibrium. What is the concentration of ammonia in this flask if K = 0.108 at 25°C for NH4HS(s) <-> NH3(g) + H2S (g)? a) 0.657 M b) 0.329 M c) 1.25 M d) 2.5 M 3) Changes in pressure will only affect substances that are in the __________ state. a) gaseous b) solid c) liquid 4) At what time (in seconds) is equilibrium established? a) 0 seconds b) 1 second c) 10 seconds d) 5 seconds 5) Why is equilibrium called a dynamic state? a) Chemists try to convert as much reactants as possible into products. b) The products of a forward reaction are favored, so equilibrium lies to the right. c) The reactions at equilibrium continue to take place once equilibrium is established. d) All chemical reactions are considered to be reversible under suitable conditions. 6) A mixture of 0.500 mol H2 and 0.500 mol I2 was placed in a 1.00L flask. The equilibrium constant Kc for the reaction H2(g) + I2(g) ↔ 2HI(g) is 54.3. What is the concentration of HI at equilibrium? a) 0.5M b) 0.786M c) 1.0M d) 0.393M 7) An equilibrium constant with a large magnitude indicates… a) A very fast reaction b) More reactants at equilibrium c) More products at equilibrium d) nothing, without considering the stoichiometry of the reaction 8) For the reaction...heat + N2 + O2 <−> 2NOIf O2 is removed, will the system reach equilibrium? a) yes b) no 9) Given: 2A(g) <-> 2B(g) + C(g). At a particular temperature, K = 1.6x104.Raising the pressure by lowering the volume of the container will... a) cause [A] to increase b) have no effect c) cannot be determined d) cause [B] to increase 10) Consider the following reaction:2SO2(g) + O2(g) ⇄ 2SO3(g) + 197 kJ/mol Which of the following will not shift the equilibrium to the right? a) Adding more O2 b) increasing the pressure c) Adding a catalyst d) Lowering the temperature

equilibrium

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