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Ch. 2.1 MATTER AND CHANGE
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Ch. 2.1 DESCRIBING MATTER Observation: using your senses to describe. –White, waxy substance Inference: making a conclusion –made of wax.
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DESCRIBING MATTER Qualitative: describing matter using the senses. –Green, smooth, circular, smells like pine, warm Quantitative: numerically descriptive – 3 cm high, weighs 5 grams.
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DESCRIBING MATTER Extensive Property: depends on the amount of the sample. (can vary from sample to sample even if same substance) –Weight, volume, height, shape Intensive Property: depends on type (composition) of substance. (doesn’t change as long as samples are made of same substance) –Color, melting point, reaction with other things
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Give examples of extensive and intensive properties of these 2 samples of Silicon
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Identifying Substances Physical Property: quality/condition of substance that can be observed or measured w/o changing substance. –Color, weight, size, volume
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Identifying substances Physical Change: changing the state but not the composition. Melting, boiling, vaporizing, freezing, crushing dissolving
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Identifying Substances Chemical Property: how does a substance react with another substance. –Iron reacts with oxygen. –combustion
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Chemical Change: the reaction that takes place when two substances react (Chemical Reaction).Composition changes. (observe bubbling, color change, precipitate Iron reacts with oxygen to make rust.
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States of Matter Solid: definite shape and volume Liquid: indefinite shape, flows, definite volume. Gas (Vapor): indefinite shape and volume, flows.
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