Question

Classify each statement about catalysts as true or false.True Falsea. Catalyst are consumed by the overall reaction.b. Catalyst speed up chemical reactionsc. Catalyst lower activation energy

Answer 1

False. True. True.
A catalyst remains chemically unchanged at the end of the reaction. Catalyst speeds up the reaction by providing an alternative pathway with lower activation energy.

Answer 2

Answer: a. Catalyst are consumed by the overall reaction: False

b. Catalyst speed up chemical reactions: True

c. Catalyst lower activation energy : True

Explanation:

Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.

A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more molecules can cross the energy barrier and convert to products.

The catalyst itself does not take part in the chemical reaction and is regenerated as such at the end.