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Chemical Kinetics
Rate Law and Order of Reaction
1 question from 1 paper, each with its answer.
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- of Chemical Kinetics
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Concepts tested
- effect of concentration on rate
All Questions
2023 1 question
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For a certain reaction, the rate $=k[A]^2[B]$. When the initial concentration of A is tripled keeping concentration of B constant, the initial rate would
Rate $\propto[A]^2$, so tripling $[A]$ multiplies the rate by 9.
Let the new rate be $R'$. $[A]'=[3A]$, $[B]'=[B]$ $R'=k[A']^2[B']=k[3A]^2[B]=9k[A]^2[B]=9\times R$ Hence, rate would become nine times.