Concentration of the reactants. X Y Reaction is fast at the beginning but slows down as it proceeds. Chemical compounds that are able to accelerate chemical reactions without themselves being changed are called catalysts . Catalysis rate acceleration by catalysts. Kinetic theory and Chemical Reactivity.
Every chemical reaction requires energy to occur.
This energy is supplied by collisions . It transforms to chemical energy. Energy of activation the minimum collision energy for the reaction. The reaction rate is proportional to the number of successful collisions. Reaction energy profiles exothermic, endothermic, catalytic, fast and slow reactions.