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he principle that in any closed system subjected to no external forces, the mass is constant irrespective of its changes in form; the principle that mattercannot be created or destroyed.

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 chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance

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Physical changes are changes affecting the form of a chemical substance, but not its chemical composition

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A special property of acids and bases is their ability to neutralize the other's properties. In an acid-base (or neutralization) reaction, the H⁺ ions from the acid and the OH⁻ ions from the base react to create water (H₂O). Another product of a neutralization reaction is an ionic compound called a salt

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the amount of space that a substance or object occupies, or that is enclosed within a container, especially when great

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a coherent, typically large body of matter with no definite shape

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a measure of the amount of information on a storage medium (tape or disk). For magnetic tape it is the amount of information recorded per unit length of tape (bits per inch or millimeter); for a disk, a fixed number of bits per sector, sectors per track, and tracks per disk.

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chemical property to consider when choosing building materials.

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A physical property is an aspect of matter that can be observed or measured without changing its chemical composition

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a substance made by mixing other substances together.

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ovalent bonding is a form of chemical bonding between two non metallic atoms which is characterized by the sharing of pairs of electrons between atoms and other covalent bonds.

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part or aspect of something abstract, especially one that is essential or characteristic

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a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.

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is a substance formed when two or more chemical elements are chemically bonded together.

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 Periodicity, and Matter: Development of the Atomic 