which of the following is not a compound?, sodium chloride, hydrogen peroxide, brass, carbon dioxide, A compound is formed when:, Elements are physically mixed, Substances are dissolved, Two or more elements chemically combine, A solid dissolves in a liquid, Which statement is true for elements?, They can be broken down chemically, They are made of different atoms, They cannot be broken down into simpler substances, They are always mixtures.

Elements and compounds

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