Basic Chemistry Concepts

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Atom

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The smallest unit of a chemical element, consisting of a nucleus surrounded by electrons.

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Element

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A substance formed when two or more of the same atom chemically combine.

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Compound

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A substance formed when two or more different chemical elements are chemically bonded together.

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Finite Number

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A number that is not infinite; it has a specific, countable value.

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Scientific Theory

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A well-substantiated explanation of some aspect of the natural world, based on a body of evidence.

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Scientific Law

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A statement based on repeated experimental observations that describes some aspect of the world.

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Neutral pH

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A pH level of 7, indicating a balance between acidity and alkalinity.

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Acidic

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Having a pH less than 7; a substance that donates hydrogen ions.

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Basic

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Having a pH greater than 7; a substance that accepts hydrogen ions.

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pH Scale

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A scale used to specify the acidity or basicity of an aqueous solution.