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Matter

Matter. II. Properties & Changes in Matter . B. Physical vs. Chemical. Physical Property Inherent characteristics that can be observed without altering the identity (composition) of the substance Chemical Property

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Matter

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  1. Matter II. Properties & Changes in Matter

  2. B. Physical vs. Chemical • Physical Property • Inherent characteristics that can be observed without altering the identity (composition) of the substance • Chemical Property • describes the ability of a substance to undergo changes in identity by either reacting with something else of decomposition.

  3. Physical Properties • Extensive Property • depends on the amount of matter present • Mass, length, volume • Intensive Property • depends on the identity of substance, not the amount • Density (g/ml), color, melting and boiling points

  4. A. Extensive vs. Intensive • Examples: • boiling point • volume • mass • density • conductivity

  5. B. Physical vs. Chemical • Examples: • melting point • flammable • density • magnetic • tarnishes in air

  6. B. Physical vs. Chemical • Physical Change • changes the form of a substance without changing its identity • Size, shape, phase • properties remain the same • Chemical Change • changes the identity of a substance • products have different properties

  7. B. Physical vs. Chemical • Signs of a Chemical Change • change in color or odor • formation of a gas • formation of a precipitate (solid) • change in light or heat

  8. Law of Conservation of Mass • In a chemical change, there is no change in the total mass of the substances involved. • Mass of Reactants = Mass of Products Mercury(II)Oxide Mercury + Oxygen

  9. B. Physical vs. Chemical • Examples: • rusting iron • dissolving in water • burning a log • melting ice • grinding spices

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