Pure Substances vs. Mixtures

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What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. It can be an element or a compound.

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What is a mixture?

Back

A mixture is a combination of two or more substances where each substance retains its own properties. Mixtures can be homogeneous or heterogeneous.

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What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition and appearance throughout, such as saltwater.

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What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture that does not have a uniform composition and can be easily separated, such as chicken noodle soup.

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What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include oxygen (O) and gold (Au).

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What is a compound?

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A compound is a pure substance formed when two or more elements chemically combine in fixed proportions. An example is sodium chloride (NaCl).

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Is Dr. Pepper a pure substance or a mixture?

Back

Dr. Pepper is a mixture.

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Is chicken noodle soup a homogeneous or heterogeneous mixture?

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Chicken noodle soup is a heterogeneous mixture.

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What type of substance is oxygen?

Back

Oxygen is an element.

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What type of substance is salt (NaCl)?

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Salt (NaCl) is a compound.