Answer the following questions.

What is a catalyst?

Substances that can alter or change the rate of a reaction are called catalyst. In simple words certain substances are added during a reaction to improve the speed of formation of products or to decrease the formation of unwanted products ae catalysts.

Eg: Hydrogen peroxide will decompose into water and oxygen gas. Two molecules of hydrogen peroxide will produce two molecules of water and one molecule of oxygen. A catalyst of potassium permanganate can be used to speed up this process.