matter and change
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Matter and Change
Mrs. Coyle
Chemistry
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A) Classification of Matter
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Some Criteria for the Classification of Matter
Properties
State (solid, liquid, gas)
Composition
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Properties
Intensive -Do not depend
on amount of matter.
Extensive -Depend on
amount of matter.
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Intensive and Extensive Properties
Sulfur
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Properties
Physical: observed without without changing the composition of the substance.
Chemical: the ability of a substance to undergo a specific chemical change
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Examples of Physical Properties
Color, odor, hardness, density, melting point, boiling point, state, solubility.
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(Pure) Substance
Matter that has a uniform and definite composition.
Elements
Compounds
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Mixture: a physical blend of two or more substances that are not chemically combined.
Homogeneous
Heterogeneous
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B) Mixtures
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MixtureA physical blend of two or more
substances.
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Note:
Mixtures can be physically separated.
Mixtures exhibit physical properties similar to the components of the mixture.
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c) Elements and Compounds
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ElementsThe simplest substances.Can not be separated into simpler
substances.Building blocks of all matter. More than 100 known elements.Represented by chemical
symbols.
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CompoundA substance that contains two or more
elements chemically combined.
Compounds have different properties from the individual substances.
(Ex: H2O)
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Substance or mixture?
If composition is fixed and may not changesubstance