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- 1. Multiple ChoiceAn equilibrium constant with a large magnitude indicates…A very fast reactionMore products at equilibriumMore reactants at equilibriumnothing, without considering the stoichiometry of the reaction
- 2. Multiple ChoiceWhy is equilibrium called a dynamic state?Chemists try to convert as much reactants as possible into products.The reactions at equilibrium continue to take place once equilibrium is established.The products of a forward reaction are favored, so equilibrium lies to the right.All chemical reactions are considered to be reversible under suitable conditions.
- 3. Multiple Choice
At what time (in seconds) is equilibrium established?0 seconds1 second5 seconds10 seconds - 4. Multiple ChoiceLe Chaltelier's Principle states that if a chemical system at equilibrium is stressed,the system will adjust to increase the stressthe system will adjust to reduce the stressthe system will not adjust
- 5. Multiple ChoiceWhen writing an endothermic reaction, heat energy is stated asproductcatalystreactant
- 6. Multiple ChoiceAn exothermic reaction is allowed to reach equilibrium. If heat energy is then removed, the equilibrium will shifttoward the middletoward the reactant sidetoward the product side
- 7. Multiple ChoiceWhich of the following is NOT true at equilibrium?The forward and reverse reactions proceed at the same rate.The concentrations of reactants and products do not change.The concentration of the reactants is equal to the concentration of the products.The forward and reverse reactions continue to occur.
- 8. Multiple ChoiceFor the reaction...
SO2(g) + O2(g) <−> SO3(g)
If the concentration of SO2(g) is increased, the equilibrium of the reaction will ___________.shift to the leftshift to the rightnot shift - 9. Multiple ChoiceFor the reaction...
SO2(g) + O2(g) <−> SO3(g)
If the equilibrium shifts to the right, the concentration of O2(g) will ___________.increasedecreaseremain the same - 10. Multiple ChoiceFor the reaction...
energy + N2(g) + O2(g) <−> 2NO(g)
If O2(g) is removed, the concentration of N2 will _______.increasedecreaseremain the samedouble - 11. Multiple ChoiceA + B <--> C + D ΔH= 151kJ
Rewrite the above equation with energy as a reactant or product:A + B <--> C + D + energyA + B + energy <--> C + D - 12. Multiple ChoiceFor the reaction...
heat + N2(g) + O2(g) <−> 2NO(g)
If the heat is removed to the chemical system, the equilibrium will _______.shift to the leftshift to the rightnot shift - 13. Multiple ChoiceFor the reaction...
N2 (g) + 3 H2 (g) <−> 2 NH3 (g)
If the pressure in the system is increased, the reaction will __________________.shift to the leftshift to the rightnot shift - 14. Multiple ChoiceWhen ΔH is negative it represents a(n)exothermic reactionendothermic reaction
- 15. Multiple ChoiceThe three factors that affect the equilibrium of a reaction are temperature, pressure and __________.energyconcentrationenthalpyice
- 16. Multiple ChoiceA(g) + B(aq) <> C(s)
ΔHrxn= -453 kJ/mol
If the [B] is decreased then the reaction is will shift to the _______.LeftRightStays the sameUp - 17. Multiple ChoiceA(g) + B(aq) <> C(s) + D(s)
ΔHrxn= 240 kJ/mol
If the pressure decreases then the reaction will shift to the _____.leftrightstays the sameUp - 18. Multiple ChoiceWhat is the proper Keq for the following reaction?
2 NO(g) + O2(g) ⇌ 2 NO2(g)Keq = [NO2]2 / [NO]2[O2]Keq = [NO]2[O2] / [NO2]2Keq = [NO]2[O2][NO2]2Keq = 2[NO][O2] / 2[NO2] - 19. Multiple ChoiceWhat is [A] and [B]?Concentration of ReactantsConcentration of ProductsEnergy of ReactantsEnergy of Products
- 20. Multiple ChoiceWhen Keq > 1,There are more products than reactants when the reaction reached equilibrium.There are more reactant than products when the reaction reached equilibrium.The amount of reactants is equal to the amount of products.
- 21. Multiple ChoiceGiven: 2A(g) <-> 2B(g) + C(g). At a particular temperature, K = 1.6x104.
Raising the pressure by lowering the volume of the container will...cause [A] to increasecause [B] to increasehave no effectcannot be determined - 22. Multiple ChoiceGiven: 2A(g) <-> 2B(g) + C(g). At a particular temperature, K = 1.6x104.
At a higher temperature, K = 1.8x10-5. Placing the equilibrium mixture in an ice bath (thus lowering the temperature) will...cause [A] to increasecause [B] to increasegave no effectcannot be determined - 23. Multiple ChoiceAt what time does the reaction reach equilibrium?t1t2t3t4
- 24. Multiple Choice2SO2(g)+O2(g)⇌2SO3(g)
Removing O2(g) willshift equilibrium rightshift equilibrium leftdecrease temperaturehave no change - 25. Multiple Choice2SO2(g)+O2(g)⇌2SO3(g) is an exothermic reaction.
an in Increase temperature will...shift equilibrium toward the rightshift equilibrium toward the leftincrease pressurehave no change - Answer choicesTagsAnswer choicesTags