A compound is a pure substance that contains two or more elements chemically combined.
The compound that contains two or more elements ends with an -ide.
magnesium + oxygen -> magnesium oxide
When the elements are chemically combined, there is always a fixed ratio.
Example: the ratio to hydrogen atoms to oxygen atoms in water is always 2 :1.
The smallest part of a compound is a molecule. Depending on the compound, the smallest particle can also be called the formula unit.
A compound can be represented by a chemical formula.
Heat can be used to form compounds. Heat can also be used to break down compounds into elements or simpler compounds. Electricity can also be used to break down compounds.
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