ClassificiationofMatter - different compositions due to...

matter - physical material of the universe
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different compositions due to different arrangements of elements
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atoms - smallest building blocks of matter
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properties of matter change due to composition/structure of the atoms
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molecule - 2+ atoms joined in a specific shape
states of matter - gas, liquid, or solid
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gas - aka vapor, has no definite shape/volume; molecules move at high speeds, often colliding w/ each
other
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liquid - definite volume, but no definite shape; molecules can slide over each other
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solid - definite shape/volume, molecules held tightly together
pure substances - has distinct properties and doesn't vary from sample to sample
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either elements or compounds
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elements - cannot be decomposed into simpler substances
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oxygen, silicon, aluminum, iron, calcium make up most of crust
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oxygen, carbon, hydrogen makes up most of human body
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similar elements grouped in the same column on the periodic table
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compounds