U2Q1: Classification of Matter Rvw

Front

What is a mixture?

Back

A combination of two or more substances that can be separated by physical processes.

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What is a pure substance?

Back

A material that has a constant composition and properties throughout; it can be an element or a compound.

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What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances.

Front

What is an atom?

Back

The smallest unit of an element that retains the properties of that element.

Front

What is a heterogeneous mixture?

Back

A mixture in which the composition is not uniform throughout; different components can be seen and separated.

Front

What is a homogeneous mixture?

Back

A mixture in which the composition is uniform throughout; the different components are not visible.

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is a compound?

Back

A pure substance formed when two or more elements are chemically bonded together.

Front

What is a suspension?

Back

A heterogeneous mixture in which solid particles are suspended in a liquid or gas and can settle over time.