A compound is a substance made up of two or more elements that have chemically joined and can only be broken down chemically into simpler compounds. For instance, pure water is a compound.
Matter with a definite composition and set of characteristics is referred to as a substance. A substance is every pure element. It is a material when it is pure. Substance examples: Because iron is an element, it's also a substance. Methane is both a material and a compound.
There are two different types of pure substances: elements and compounds. One particular type of atom makes up each element, whether it exists on its own or as part of a molecule. Compounds are molecules made up of two simpler things than molecules.
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