Elements, Compounds & Mixtures - Basics

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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 oxygen (O) and carbon (C).

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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 a mixture?

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A mixture is a combination of two or more substances that are not chemically bonded. Mixtures can be homogeneous or heterogeneous.

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture in which the composition is uniform throughout. An example is air.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture in which the composition is not uniform throughout. An example is pizza.

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What is the chemical formula for oxygen?

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The chemical formula for oxygen is O2.

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What is the chemical formula for carbon dioxide?

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The chemical formula for carbon dioxide is CO2.

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What is the chemical formula for ammonia?

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The chemical formula for ammonia is NH3.

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Is air a compound or a mixture?

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Air is a homogeneous mixture.

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Is pizza a compound or a mixture?

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Pizza is a heterogeneous mixture.