Formulae and Equations

An Element (an element has it's own chemical symbol) is a substance that connot be split into simpler substances. An atom is the smallest part of an element that can take part in chemical reactions. A molecule is two or more atoms chemically joined together.

A compund is a sunstance that consists of atoms of different elements chemically joined together. A mixture is just a mixture of different elements or compounds which is not all chemically bonded.

During a chemical reaction the atoms in the reactants are rearranged to make different products.

Equation for reactions

Chemical reactions can be represented using words or symbols.

hydrogen+chlorine = hydrogen chloride

H2(g)   + Cl2(g)   = 2HCl(g)

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