Example of photography in conditions favoring a chemical change
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Chemical changes result in the formation of new substances when the composition of the original substance is changed; for example, when a metal reacts with the oxygen of the air it forms a new substance called an oxide (as when iron goes rusty). Essential oils can also react with oxygen, which alters their chemical composition and properties. Other chemical reactions can be initiated by light and are called photochemical reactions (photo means light). The photochemical process of photosynthesis is essential to green plants for the manufacture of food using light as an energy source. Heat will usually speed up chemical reactions, by increasing the kinetic energy of atoms or molecules so that they collide and interact more frequently. Living systems contain complex protein molecules called enzymes which act as catalysts to either speed up or slow down the rates of the chemical reactions occurring in the cells.