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a usually irreversible 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: The formation of rust on iron is achemical change.

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

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Examples of chemical properties of a substance can include:

toxicity.

oxidation.

flammability.

heat of combustion.

enthalpy of formation.

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Extensive properties, such as mass and volume, depend on the amount of matter being measured.

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Examples of intensive properties include:

chemical potential, μ

color.

concentration, c.

density, ρ (or specific gravity)

magnetic permeability, μ

melting point and boiling point.

molality,

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Physical Properties: Physical properties can be observed or measured without changing the composition of matter.

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A heterogeneous mixture is simply any mixture that is not uniform in composition

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A homogeneous mixture is a solid, liquid, or gaseous mixturethat has the same proportions of its components throughout any given sample.

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a combination of different qualities, things, or emotions in which the component elements are individually distinct.

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a particular kind of matter with uniform properties