1.) At higher temperatures, the fraction of molecules with enough energy to over

Question

1.) At higher temperatures, the fraction of molecules with enough energy to overcome the activation energy barrier is ______.

a) larger b)smaller c) same

2.) Rates increase with increasing concentration of reactants because collisions between reactant molecules occur with ______ frequency.

a) higher b)lower c)same

3.)The mechanism of a reaction without a catalyst is ______ the mechanism of that same reaction with a catalyst.

a) the same as b) different form

4.) The activation energy of a reaction is ______ at a higher temperature than (and) at a lower temperature.

a) higher b )lower c) the same

Explanation / Answer

Answers:

1) larger

Higher the energy of the reacting molecules lower will be the activation energy and hence more number of molecules will be able to overcome the activation energy barrier.

2) higher

Rate of reaction increaes with concentration because the colission frequency of the reacting molecules increase as the number of molecules increases.

3) different form

A reaction with a catalyst follows a different mechanism which involes the catalyst as well.

4) lower

Activation energy becomes lower because at higher temperature the reacting mecules already posses a certain amount of energy and they require a lesser amount of energy to overcome the activation energy barrier.

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