Chemistry question, help

Question

Distinguish between the following:

4.1.1 Reaction order and molecularity.

4.1.2 Catalyst and intermediate with regard to elementary steps.

4.1.3 Homogeneous catalysis and heterogeneous catalysis.

Answer 1

Reaction order is the sum of the powers to which the reactant concentrations are raised in the rate law equation. This is determined experimentally.

Molecularity is the number of molecules or ions that take part in the rate determining step. This is a theoretical value based on a hypothetical reaction mechanism.

A catalyst is something that increases the rate of the reaction without being used up in the reaction.

An intermediate is something that is produced in one elementary step and used in a subsequent elementary step of a reaction mechanism.

Homogeneous catalyst is one that exists in the same phase or state as the other components of the reaction. A heterogeneous catalyst is one that exists in a different phase or state from the other components of the reaction.