A compound is composed of two or more elements in
a specific ratio. For example, water is a compound made up of two elements,
hydrogen (H) and oxygen (O). These elements are combined in a very specific way
— in a ratio of two hydrogen atoms to one oxygen atom, known as:
H2O
Many compounds contain hydrogen and
oxygen, but only one has that special 2 to 1 ratio we call water. The compound
water has physical and chemical properties different from both hydrogen and
oxygen — water’s properties are a unique combination of the two elements.
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