Factors Affecting Rate of Reaction

Increasing the pressure of a gas. There are more particles in a given volume so collisions are more likely so there are more frequent collisions. As the reaction proceeds the reactants are used up and the rate of reaction decreases.Increasing the surface area of a solid reactant More gas or liquid particles collide with the solid particles as more of its particles are on the surface and can be in contact with the other reactants and there are more sites for the reaction to occur.Using a catalyst. A catalyst increases the rate of reaction without being chemically changed itself.