the basic building blocks of matter; the smallest unit of an element that maintains the properties of that element

a pure substance made up of one type of atom; a substance that cannot be broken down into simpler materials

a particle made up of two or more atoms that are chemically joined; the smallest unit of a compound that keeps all the properties of that compound

a substance made up of two or more atoms of different elements that are chemically combined

a combination of two or more substances or a variety of elements and compounds that are not chemically combined

either a single element or a single compound, that has definite chemical and physical properties

Which of the following does not describe a pure substance?

What happens when a pure substance undergoes a chemical change?

How can elements be classified?

How can compounds be classified?

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