Question

Zinc reacts with excess hydrochloric acid to produce zinc chloride and hydrogen gas. What happens to the reaction rate if you increase the concentration of zinc?
A. The reaction rate decreases because the area available for particle movement is decreased.
B. The reaction rate decreases because the probability the reverse reaction is more likely.
C. The reaction rate increases because the energy of each particle increases.
D. The reaction rate increases because the probability of collisions increases.

Answer 1

Answer:

D.The reaction rate increases because the probability of collisions increases.

Explanation:

We are given that Zinc reacts with excess hydrochloric  acids to produce zinc chloride and hydrogen gas

Now , we have to find the effect on the rate of reaction when the concentration of zinc increases.

When the concentration of zinc increases then the number of moles per unit volume of reactant increases to form product.Therefore, the number of moles per unit volume  of product also increases.

If the concentration of reactant increases then the rate of reaction increases because then large number moles per unit volume  of reactant increases to form the large number of moles per unit volume of product.

When the rate of reaction increases because the probability of collisions of atoms of reactant increases.

Hence. option D is true.

Answer 2

The correct response I believe is D. The reaction rate increases because the probability of collisions increases as there are more Zn atoms to react.