Question

What overall effect does adding a catalyst have on a chemical reaction?
It slows the reaction.
It speeds up the reaction.
It reduces the concentration of products.
It increases the concentration of reactants.

Answer 1

A catalyst speeds up a reaction while not being altered overall by the reaction itself, so the second answer is correct.
Hope this helps!

Answer 2

Answer: Option (b) is the correct answer.

Explanation:

Catalyst are the species or substance which increases the rate of a reaction without itself getting consumed in the chemical reaction.

A catalyst changes the path of a reaction so that the reactant molecules with less energy can easily participate in the reaction. Therefore, the formation of products become faster.

Thus, we can conclude that overall effect of adding a catalyst have on a chemical reaction is that it speeds up the reaction.