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Each element is unique in terms of reactivity. Most elements react readily in high temperatures, but some react quicker in the cold. The same tendency is observed in respect to pressure, with most elements reacting as pressure increases. However, some others react as pressure decreases. In terms of internal factors, a higher surface area correlates with greater reactivity because reagents have a greater chance of making contact with the substance.
From Wikipedia, the free encyclopedia. Chemical composition refers to the arrangement, type and ratio of atoms in molecules of chemical substances. Chemical composition varies when chemicals are added or subtracted from a substance, when the ratio of substances changes, or when other chemical changes occur in chemicals.The chemical composition of a substance determines the properties of the substance.This means that the way atoms are put together in something determines the color, density, strength, and other properties of the thing. This short article about chemistry can be made longer. You can help Wikipedia by adding to it.he chemical composition of a substance determines the properties of the substance. This means that the way atoms are put together in something determines the color, density, strength, and other properties of the thing. This short article about chemistry can be made longer. You can help Wikipedia by adding to it.