Question

When zinc reacts with hydrochloric acid, it produces hydrogen gas. As the reaction proceeds, why does the rate of production of hydrogen gas decrease?

A. The concentration of hydrogen gas decreases.
B. The concentration of the reactants decreases.
C. The hydrogen gas formed inhibits the reaction.
D. The hydrogen gas also reacts with the zinc metal.

Answer 1

The rate of production of hydrogen gas decreases as the reaction proceeds because the concentration of the reactants decreases.

Step-by-step explanation:

The rate of production of hydrogen gas decreases as the reaction proceeds because the concentration of the reactants decreases. Initially, there is a high concentration of zinc and hydrochloric acid, which leads to a rapid production of hydrogen gas. However, as the reaction progresses, the concentration of zinc and hydrochloric acid decreases, resulting in a slower rate of gas production.