Elements, Mixtures, and Compounds Review

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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 and can be separated by physical means. Examples include salad and air.

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What is a compound?

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A compound is 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 an element?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include gold (Au) and oxygen (O2).

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture that is not uniform in composition; the different components can be seen and separated. Examples include a salad or a rocky beach.

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What is a 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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What is an alloy?

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An alloy is a mixture of two or more metals, or a metal and another element, that has metallic properties. Examples include steel (iron and carbon) and bronze (copper and tin).

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What is a colloid?

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A colloid is a mixture where tiny particles of one substance are evenly distributed throughout another substance. Examples include milk and fog.

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What is a solution?

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A solution is 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 suspension?

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A suspension is a heterogeneous mixture in which solid particles are suspended in a liquid or gas but will settle over time. Examples include muddy water.

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What is the role of nitrogen in the atmosphere?

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Nitrogen makes up about 78% of the Earth's atmosphere and is essential for the growth of plants and animals.