Chapter 2
Properties of Matter
Classifying Matter
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Composition: Latin for “putting together”
Pure Substance: matter with uniform composition
Elements
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Cannot be broken down into simpler
substances
Made up of alike atoms which are the
building blocks of matter
No two elements can have the same type
of atom
Examples: aluminum (Al), gold (Au),
carbon (C)
Compounds
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Made up of two or more elements joined
in a fixed proportion
Represented by chemical formulas
Ex: H2O, NaCl, CO2,
Mixtures
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Two or more substances mixed together but not
chemically combined
Composition is not fixed
Heterogeneous: parts are noticeably different
than one another
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Cereal, Sand,
Homogeneous: Evenly distributed particles and
hard to differentiate

Water, Stainless steel
Classification of mixtures
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Solutions:
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Homogeneous substance that dissolves
uniformly
Ex: Pop, Lemonade, Gatorade
Colloids
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Homogeneous mixture that is mixed together
but not dissolved
Appears cloudy and scatters light
Milk, Cool Whip, Lotions
Classification of mixtures
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Suspensions:
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Heterogeneous that suspends over time
Lake water
Composition of Matter
Matter
Pure Substance
Element
Compound
Mixture
Homogeneous
Solution
Colliod
Heterogeneous
Suspension