Pure Substances & Mixtures

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

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together, resulting in new properties.

Front

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

Back

A homogeneous mixture has a uniform composition throughout (e.g., saltwater), while a heterogeneous mixture has a non-uniform composition (e.g., salad).

Front

Can compounds be separated into their components?

Back

No, compounds cannot be separated into their components by physical means; they require chemical reactions.

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What is an example of a homogeneous mixture?

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An example of a homogeneous mixture is air, which is a uniform mixture of gases.

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What is an example of a heterogeneous mixture?

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An example of a heterogeneous mixture is a mixture of sand and iron filings.

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What are physical properties used for?

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Physical properties are used to separate mixtures, such as filtration, distillation, and evaporation.

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Do compounds retain the properties of their individual elements?

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No, compounds do not retain the properties of the individual elements that make them up.

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What is a solution?

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A solution is a type of homogeneous mixture where one substance (the solute) is dissolved in another (the solvent).