A pure substance composed of two or more elements that are chemically combined

A poisonous, greenish yellow gas

When two or more elements join together chemically

The elements in a compound

Which of the following will NOT break down compounds?

How do elements join to form compounds?

Which of the following statements is true about the properties of compounds?

Compounds cannot be broken down by any mean

compounds can be broken down only by chemical changes

heating can break down some compounds

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