Pure Substances, Mixtures, and Solutions

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What is a pure substance?

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A pure substance is a material that has a constant composition and properties throughout. Examples include elements and compounds.

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What is a mixture?

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A mixture is a combination of two or more substances that are not chemically bonded. Examples include salad and air.

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What is a solution?

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A solution is a type of mixture where one substance is dissolved in another, such as saltwater.

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What is an element?

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An element is a pure substance that consists of only one type of atom. Examples include hydrogen and oxygen.

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What is a compound?

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

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How can mixtures be separated?

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Mixtures can be separated by physical means, such as filtering or sorting.

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How can compounds be separated?

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Compounds can only be separated by chemical means, such as through a chemical reaction.

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What is the difference between a homogeneous mixture and a heterogeneous mixture?

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A homogeneous mixture has a uniform composition throughout (like saltwater), while a heterogeneous mixture has visibly different substances or phases (like a salad).

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What is an example of a homogeneous mixture?

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An example of a homogeneous mixture is vinegar.

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What is an example of a heterogeneous mixture?

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An example of a heterogeneous mixture is a bowl of cereal.