Pure substances and Mixtures Review

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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 where each 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 throughout, meaning the individual components are not distinguishable. Example: saltwater.

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Define heterogeneous mixture.

Back

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

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What is the difference between a mixture and a compound?

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A mixture is a physical combination of substances that can be separated, while a compound is a chemical combination of substances that cannot be separated by physical means.

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What is an example of a pure substance?

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Examples of pure substances include distilled water, gold, and oxygen.

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What indicates that a sample is a pure substance?

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If the composition of a sample is fixed and does not vary, it indicates that the sample is a pure substance.

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Can a mixture be separated by physical means?

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Yes, mixtures can be separated by physical means such as filtration, distillation, or evaporation.

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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 with milk, where the individual components can be seen.

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What happens to the properties of substances in a mixture?

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In a mixture, the properties of the individual substances remain unchanged.