At a constant temperature, which of the following would be expected to affect th
ID: 502021 • Letter: A
Question
At a constant temperature, which of the following would be expected to affect the rate of a given chemical reaction, A+ B rightarrwo C+ D? The reaction temperature The concentration of the products A catalyst The conversion of cis-2-butene to trans-2-butene takes place in a reaction that is first order with respect to cis-2-butene. The conversion was observed in two separate trials under identical conditions except that in the second trial, the concentration of cis-2-butene was doubled. In the second trial: a. the reaction rate will be halved b. the reaction rate will be doubled c. the rate constant will be halved d. the rate constant will be doubled Determine the rate law for the reaction, 2ICl + H_2, I_2 + 2HCl,Explanation / Answer
5)ans iii) A catalyst
A catalyst enhances the rate of a chemical rxn by conducting the rxn through a low activation energy pathway .The rate of both forward and reverse rxn equally.
ii) concentration of product
if the product concentration is decreased by its removal ,then the rxn is directed in forward direction to produce products at a faster rate.(Le chatlier's principle)
6)Cis-2-butene<--->trans-2-butene
rate law,
rate=k[cis-2-butene]^n ,n=1 (first order)
if [cis-2-butene] is doubled ,2*[cis-2-butene]
rate"=K*2[cis-2-butene]=2*k[cis-2-butene]=2*rate
the rate is doubled
b) correct
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