Pure Substances and Mixtures Flashcard

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What is a pure substance?

Back

A pure substance is a material that contains only one type of particle, either an element or a compound.

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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.

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What is a homogeneous mixture?

Back

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

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture that has a non-uniform composition, such as a salad.

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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.

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What is a compound?

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A compound is a pure substance formed when two or more different elements are chemically bonded together.

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What is a molecule?

Back

A molecule is formed when two or more atoms bond together, which can be of the same or different elements.

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What distinguishes a compound from a mixture?

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A compound consists of chemically bonded elements, while a mixture consists of physically combined substances.

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Can a mixture be a pure substance?

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No, a mixture is not a pure substance because it contains two or more different components.

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What is an example of a compound?

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Water (H2O) is an example of a compound, made up of hydrogen and oxygen atoms.