Reactions occur when particles collide and rates of reaction are increased when the frequency and/or energy of collisions is increased.
The factors affecting rate: temperature, concentration, surface area to volume ratio of a solid, pressure (involving gases). These factors all affect frequency or energy of collisions between particles.
Rate of reaction = amount of product formed/ time (upward curve plateaus)
Rate of reaction = amount of reactant used/ time (downward curve plateaus)
Catalyst: speeds up rate of a reaction without affecting the reaction by reducing activation energy.
Activaton energy: minimum energy needed to start a reaction successfully.
Enzymes are biological catalysts and they are used in the production of alcoholic drinks