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What is a Chemical Formula?

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A way of writing what elements are in a compound and how many atoms of each element there are. For example, the chemical formula for water is H₂O.

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What is a Substance?

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A type of matter with a specific set of properties. Examples include water, salt, and sugar.

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What is a Compound?

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A substance made when two or more different elements are chemically combined. For example, water is a compound made of hydrogen and oxygen.

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What is Matter?

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Anything that has mass (weight) and takes up space. Everything around you, like air, water, and rocks, is made of matter.

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What is a Proton?

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A tiny particle in the nucleus (center) of an atom that has a positive charge.

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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 carbon.

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What is an Atom?

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

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What is a Neutron?

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A particle in the nucleus of an atom that has no charge (neutral).

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What is an Electron?

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A negatively charged particle that orbits the nucleus of an atom.

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What is a Mixture?

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A combination of two or more substances that are not chemically combined. Examples include air and salad.