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Study Quiz 3
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1
Which of the following is not true?
A)Reactions mechanisms are proposed, not definitively stated.
B)Elementary reactions in reaction mechanisms all have the same rates.
C)Elementary reactions in reaction mechanisms all have different rates.
D)Researchers provide evidence for a reaction by proving the existence of a reaction intermediate.
2
A hypothetical reaction is made up of two elementary steps. The first step is faster than the second step. Which of the following is true?
A)The activation energy barrier for the first step is greater than for the second step.
B)The second step determines the overall rate of the reaction.
C)The first step determines the overall rate of the reaction.
D)The reaction will not take place.
3
A catalyst
A)increases the rate of a chemical reaction and is consumed by the reaction
B)decreases the rate of a reaction and is consumed by the reaction
C)increases the activation energy of a reaction
D)none of the above
4
Which of the following is not true?
A)Catalysts increase the rate of reverse reactions.
B)Catalysts decrease the rate of the reverse reactions.
C)Catalysts lower the activation energy of reactions.
D)Catalysts are very important in industrial chemistry.
5
Which of the following is true?
A)A homogeneous catalyst exists in a different phase than the reactants of the reaction it catalyzes.
B)A homogeneous catalyst most often catalyzes reactions of liquids and solids.
C)A homogeneous catalyst exists in a phase that is the same as the products but different than the reactions.
D)A homogeneous catalyst most often catalyzes aqueous and gaseous reactions.
6
A heterogeneous catalyst
A)exists in the same phase as the reactants and products
B)exists in a phase that is different than the products but the same as the reactants
C)is used in the addition of hydrogen to an organic compound
D)none of the above
7
Which of the following is not true?
A)A reaction rate can be expressed as a change in the amount of reactant consumed per unit of time.
B)A reaction rate can be expressed as a change in the concentration of a reactant per unit of time.
C)A reaction rate can be expressed as a change in the concentration of a product per unit of time.
D)All of the above.
8
Which of the following does not affect the rate of a reaction?
A)The fastest step in a reaction
B)The nature of the reactants
C)Temperature
D)Concentration of the reactants





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