Matter Vocabulary

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anything that has mass takes up space

matter

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describes an object (color, size, texture)

property

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small particle that is the basic unit of matter

atom

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two or more atoms chemically bonded together

molecule

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a physical property that describes the mass per unit volume of a substance

solid liquid gas

density

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the positively charged particle in the nucleus of an atom

proton

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a particle with no charge in the nucleus of an atom

neutron

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negatively charged particles in an atom (in a cloud around the nucleus)

electron

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matter made of only one type of atom

Examples: oxygen, calcium

element

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a chart that organizes all known elements

Periodic Table

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matter made by combining two or more different kinds of elements

Examples: water

compound

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a formula composed of symbols and numbers that shows which elements make the compound

Example: H2O

chemical formula

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two or more substances put together that do not form a compound

Example: rocks, air

mixture

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a measure of the amount of matter in an object

mass

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symbols that show how matter changes during a chemical reaction

chemical equation

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Substance that is changed during a chemical reaction

reactants

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new substance created during a chemical reaction

products