Pure Substances and Mixtures

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What is a Pure Substance?

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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 combination of two or more substances that retain their individual properties. Mixtures can be homogeneous or heterogeneous.

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What is an Element?

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A pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen, oxygen, and gold.

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What is a Compound?

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A 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 a Homogeneous Mixture?

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

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What is a Heterogeneous Mixture?

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A mixture that does not have a uniform composition and the individual components can be seen. Examples include salad and sand.

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What are Atoms?

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The smallest unit of an element that maintains the properties of that element.

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What is a Solution?

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A homogeneous mixture where one substance (the solute) is dissolved in another (the solvent). Examples include sugar in water.

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What is a Solvent?

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The substance in a solution that dissolves the solute. It is usually present in the largest amount.

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What is a Solute?

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The substance that is dissolved in a solution. It is usually present in a smaller amount compared to the solvent.