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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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A physical change is a change in which no new substances are formed. Physical changes affect the form of a chemical substance, but not its chemical composition. ... But can not usually be used to separate compounds into chemical elements or simpler compounds.

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Chemistry. a property or characteristic of a substance that is observed during a reaction in which the chemical composition or identity of the substance is changed: Combustibility is an important chemical property to consider when choosing building materials.

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An extensive property is a property that depends on the amount of matter in a sample. Mass and volume are examples of extensive properties. ... Color, temperature, and solubility are examples of intensive properties.

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Intensive properties are bulk properties, which means they do not depend on the amount of matter that is present. Examples of intensive properties include: Boiling point. Density.

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A physical property is any property that is measurable, whose value describes a state of a physical system. The changes in the physical properties of a system can be used to describe its changes between momentary states. Physical properties are often referred to as observables. They are not modal properties.

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A heterogeneous mixture is simply any mixture that is not uniform in composition – it's a non-uniformmixture of smaller constituent parts. Using variousmeans, the parts in the mixture can be separated from one another.

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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. Conversely, a heterogeneous mixture has components whose proportions vary throughout the sample. ... An example of a homogeneous mixture is air.

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a substance made by mixing other substances together.

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a particular kind of matter with uniform properties.