Pure Substances & Mixtures

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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 consistent 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 where each substance retains its own properties. Mixtures can be homogeneous or heterogeneous.

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Define homogeneous mixture.

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A homogeneous mixture is a mixture that has a uniform composition throughout. Examples include saltwater and air.

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Define heterogeneous mixture.

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A heterogeneous mixture is a mixture where the components are not uniformly distributed, and different parts can be seen. Examples include salad and sand.

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What is a solution?

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

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Are elements considered pure substances?

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Yes, elements are considered pure substances because they consist of only one type of atom.

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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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What is the difference between a solute and a solvent?

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A solute is the substance that is dissolved in a solution, while a solvent is the substance that does the dissolving.

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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 is a uniform mixture of acetic acid and water.

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What is an example of a heterogeneous mixture?

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An example of a heterogeneous mixture is a fruit salad, where the different fruits can be seen and separated.