Pure Substances vs. Mixtures

Front

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.

Front

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.

Front

Define homogeneous mixture.

Back

A homogeneous mixture is a mixture that has a uniform composition and appearance throughout. Examples include saltwater and air.

Front

Define heterogeneous mixture.

Back

A heterogeneous mixture is a mixture that does not have a uniform composition and can have visibly different substances. Examples include salad and chicken noodle soup.

Front

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).

Front

What is a compound?

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A compound is a pure substance formed when two or more elements are chemically combined in fixed proportions. Examples include water (H2O) and carbon dioxide (CO2).

Front

Is carbon dioxide a pure substance or a mixture?

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Carbon dioxide is a pure substance and a compound.

Front

What can be inferred about a clear liquid with multiple ingredients listed on its label?

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If a liquid contains multiple ingredients, it is likely a homogeneous mixture.

Front

What distinguishes a pure substance from a mixture?

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A pure substance has a fixed composition and distinct properties, while a mixture consists of two or more substances that can vary in composition.

Front

Can a mixture be separated into its components?

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Yes, mixtures can be separated into their individual components by physical means, such as filtration or distillation.