Unit 2 Properties & States of Matter Review

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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. Examples include elements and compounds.

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What is a mixture?

Back

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

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What is sublimation?

Back

Sublimation is the phase change from a solid directly to a gas without passing through the liquid state. An example is dry ice (solid carbon dioxide) turning into gas.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is one in which the components are not uniformly distributed, and different parts can be seen. Examples include salad and fruit loops.

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What is a homogeneous mixture?

Back

A homogeneous mixture is one in which the components are evenly distributed and cannot be distinguished from one another. An example is saltwater.

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What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together in a fixed ratio. An example is carbon dioxide (CO2).

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What is an element?

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

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What is the phase change from a gas to a solid called?

Back

The phase change from a gas to a solid is called deposition.

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What is the phase change from a liquid to a gas called?

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The phase change from a liquid to a gas is called evaporation.

Front

What is condensation?

Back

Condensation is the phase change from a gas to a liquid. An example is water vapor turning into liquid water on a cold surface.