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Theories of Catalysis

A catalyst ei...

Question

A catalyst either increases or decreases the rate of a chemical change and at the end of the reaction.

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Solution

A catalyst is a substance that increases the rate of a chemical reaction by reducing the activation energy , but which is left unchanged by the reaction.
A piece of platinum foil is a catalyst for the combustion of methane in air.

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Complete the following statements:

(a) The chemical change involving iron and hydrochloric acid illustrates a ___ reaction.

(b) In the type of reaction called ___ two compounds exchange their positive and negative redicals.

(c) A catalyst either ___ or ___ the rate of a chemical change but itself remains ___ at the end of the reaction.

Q. Assertion :Catalyst is a substance which takes part in a chemical reaction, undergoes chemical change and alters the rate of a reaction Reason: Catalyst is a substance which does not take part in a chemical reaction, but changes the rate of reaction

Q. Assertion :A catalyst increases the rate of reaction without itself undergoing any permanent chemical change. Reason: A catalyst changes the Gibbs energy

(△ G)

of the reaction and equilibrium constant of the reaction.

27^{o} C

of a chemical reaction increases

1000

times when a suitable catalyst is introduced. Calculate the change in the energy of activation that the catalyst has brought in.

A catalyst increases the rate of forward reaction and decreases the rate of backward reaction.

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