ASU Spring - CHM 116 (Cabirac) - Exam 1 questions with answers

ASU Spring - CHM 116 (Cabirac) - Exam 1
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questions with answers |\ |\




What is meant by the term "reaction rate?" - CORRECT
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ANSWERS ✔✔The change in amount of products or |\ |\ |\ |\ |\ |\ |\ |\



reactants in a given amount of time; the speed of a |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\



chemical reaction. |\




What factors affect the rate of a chemical reaction? -
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CORRECT ANSWERS ✔✔The concentration of the |\ |\ |\ |\ |\ |\



reactants, physical state of the reactants, temperature, |\ |\ |\ |\ |\ |\ |\



and presence of a catalyst
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Is the rate of disappearance of reactants always the same
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as the rate of appearance of products? - CORRECT
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ANSWERS ✔✔No, because stoichiometry must be known |\ |\ |\ |\ |\ |\ |\



to relate the two
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A + B --> C
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Rate = k[B]^2 |\ |\




What are the reaction orders for A and B and the overall
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reaction order? What are the units of the rate constant? -
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CORRECT ANSWERS ✔✔A = zero order |\ |\ |\ |\ |\




B = second order
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, Overall = second order |\ |\ |\




M^(-1)*s^(-1)


What quantity, when graphed versus time, will yield a
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straight line for a first-order reaction? - CORRECT
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ANSWERS ✔✔ln[A] |\




How can you calculate the rate constant for a first-order
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reaction? - CORRECT ANSWERS ✔✔On a graph of ln[A]
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versus time, k is the (-slope of the straight line
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How do you find how much a concentration remains after
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n half-lives? - CORRECT ANSWERS ✔✔[A] = [A]0/2^n
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For a generic second-order reaction A --> B, what
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quantity, when graphed versus time, will yield a straight
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line? What is the slope of the straight line? - CORRECT
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ANSWERS ✔✔1/[A] |\




k


What is meant by the term elementary reaction? -
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CORRECT ANSWERS ✔✔A process that occurs in a single|\ |\ |\ |\ |\ |\ |\ |\ |\



event; the order is given by the coefficients in the
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balanced equation for the reaction |\ |\ |\ |\