Unit 4 kinetics

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what is the rate of a chemical reaction?
the change in concentration of a substance in unit time. it can be found from an experiment
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how does a rate determining step occur?
when a reaction happens in more than one stage and a slower stage occurs
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How is the rate equation written?
Rate=k[A]^m[B]^n
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In the rate equation, what is k?
the rate constant, with a value specific to the temperature
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In the rate equation, what are m and n?
the order of reaction with respect to A and B
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In the rate equation, what is the overall order?
the sum of the individual orders (m+n)
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what happens on a graph of conc against time for a reaction that is zero order?
the conc falls at a stead rate with time
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what happens on a graph of conc against time for a reaction that is first order?
the conc halves in equal time intervals
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what happens on a graph of conc against time for a reaction that is second order?
the conc falls by a factor of 4 in equal time intervals
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what happens on a graph of rate against conc for a reaction that is zero order?
the rate is unaffected by changes in conc
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what happens on a graph of rate against conc for a reaction that is first order?
the rate doubles as the conc doubles
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what happens on a graph of rate against conc for a reaction that is second order?
the rate quadruples as the conc doubles
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how can the inital rate method be used to determine the rate equation?
vary the conc of reactants and measure the initial rate of reactions as a target, changing conc of 0order wont change rate, 1storder will double and 2ndorder will quadruple. Both reactants muct be doubled in conc to use the effect to deduce overorder
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Card 2

Front

how does a rate determining step occur?

Back

when a reaction happens in more than one stage and a slower stage occurs

Card 3

Front

How is the rate equation written?

Back

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Card 4

Front

In the rate equation, what is k?

Back

Preview of the front of card 4

Card 5

Front

In the rate equation, what are m and n?

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