D
Question 3
A catalyst is considered as a reactant in a chemical reaction.
o True
o False

A catalyst is considered as a reactant in a chemical reaction.

False

Explanation:

A catalyst hasten the chemical process of a reaction involving reactants and the end products. Catalyst is not part of the reaction as it only helps to hasten up the chemical reaction

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%