If you want your water to boil faster, you increase the temperature by turning the knob on high. Most reactions go faster at higher temperatures. Remember the difference between water vapor particles and ice particles. Water vapor particles move about more rapidly then ice particles. Ice particles are moving in slow motion compared to the gas particles.
Scientists believe adding a catalyst to a reaction increases the number of particle collisions.
A collision is when something hits something else with great energy. Some examples of catalysts are enzymes. There are enzymes in your mouth that help speed up the procees of digestion. Energy and chemical reactions Chemical reactions require energy. This energy can either be released or absorbed.