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A compound is a substance made up of two or more elements combined chemically. This combination is similar to a recipe for a dessert in which one combines the different ingredients in specific amounts to one another to create a delicious treat!
Compounds are made up of elements which are a kind of atom or of a combination of compounds. When they are combined chemically, it is very difficult to separate out the different elements just as it is very difficult once a cake is baked to separate out the eggs, flour, sugar and other ingredients.
Compounds often have common names such as water or salt - but are also named by their formula which tell what elements make up the compound and in what proportion. For example, the smallest bit of water, a molecule of water, is made up of two hydrogen atoms for every one oxygen atom. A formula is similar to a very precise recipe for a compound.
Compounds are made up of many, many molecules of that compound.
Compounds and Mixtures Videos