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Physical Properties and Changes

Explore physical properties and changes in matter, including examples such as color, solubility, and density. Learn how to identify mystery substances based on their properties and understand physical changes like melting and freezing.

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Physical Properties and Changes

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  1. Physical Properties and Changes

  2. Physical Property • A quality or condition of a substance that can be observed or measured without changingthe substance’s composition • Examples • Color • Solubility • Density • Melting or boiling point • Odor • Hardness

  3. Using Physical Properties • Mystery substance… • Odorless • Freezes at 0 °C • Melts at 100 °C • Has a density of 1 g/ cm³ • Clear • What is the mystery substance? WATER!

  4. Physical Changes • Matter is altered without altering the chemical composition of the material • Examples: cutting, grinding, bending, freezing, melting, boiling dissolving, condensing, crushing, breaking

  5. Physical Changes: changes between states of matter • Melting – solid to liquid • Freezing – liquid to solid • Vaporization – liquid to gas (evaporation) • Condensation – gas to liquid • Sublimation – solid straight to gas • Crystallization – gas to solid

  6. Conservation: Physical Change • http://video.google.com/videoplay?docid=-40474112520688034&pr=goog-sl

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