Composition of Matter

Front

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 that are not chemically bonded and can be separated by physical means.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition throughout, meaning the individual components are not distinguishable. Example: saltwater.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture where the individual components can be seen and are not uniform throughout. Example: salad.

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, hydrogen, and gold.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together. Example: water (H2O) is a compound of hydrogen and oxygen.

Front

Is air a pure substance or a mixture?

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Air is a mixture because it contains various gases, including nitrogen, oxygen, and carbon dioxide, that are not chemically combined.

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What is an example of a homogeneous mixture?

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An example of a homogeneous mixture is vinegar, which has a uniform composition throughout.

Front

What is an example of a heterogeneous mixture?

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An example of a heterogeneous mixture is a bowl of cereal with milk, where the cereal pieces can be seen and separated.

Front

What is the difference between a compound and a mixture?

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A compound is made of two or more elements chemically bonded together, while a mixture is a physical combination of substances that can be separated.