A measurement of the amount of matter in an object

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a measurement of the amount of (3-dimensional) space an object takes up

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The study of the materials that make up the universe (matter) and the changes these materials undergo.

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any of the more than 118 known pure substances that cannot be separated into simpler forms

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created by Dmitri Mendeleev in 1869 The periodic table is a chart of all the known elements in order of increasing atomic number, organized in groups according to their properties.

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characteristics of a substance that never changes and can be used to identify the substance. E.g.: melting point, density, hardness, etc.

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A change that alters the appearance of a substance, but does not create a new substance.

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 A change that results in the formation of a new substance

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a substance made of two or more different elements

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The smallest particle of a substance, made up of one or more atoms

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Two or more substances that are mixed together, but do not chemically combine

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a chemical reaction that releases energy (heat), feeling hot

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A chemical reaction that absorbs energy (heat), feeling cold

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one of the three groups of elements that share properties such as high luster (shiny), good conductors of heat energy and electricity, high melting points, and usually bend without breaking (malleable)

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one of the three groups of elements that share properties such as low luster (dull), bad conductors of heat and electricity, low melting points, and are brittle (crumble) when solid.

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also called semi-metals, one of the three groups of elements that share properties of both metals and nonmetals.

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the substances that start a chemical reaction

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the new substances (with different properties) that are formed in a chemical reaction.

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Anything that takes up space (volume) and has mass

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