Effect of changing pressure on rate of reaction:

if one or more of the reactants are gaseous, an

increase in pressure will increase their concentration. Increasing the concentration, increases the

number of particles in a given volume thus the reacting particles will collide more frequently so the

number of collisions will increase per unit time, thus rate of reaction increases. Pressure can be

increased by either injecting more gas or by decreasing the volume of vessel in which the reaction is

occurring.