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Changes in Matter. Chapter 2 Section 2. Physical Change. Physical Change : Any change that alters the appearance of matter but DOES NOT make a different substance. Examples: Changing the state of matter  solid, liquid, gas

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Changes in Matter

Chapter 2 Section 2


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Physical Change

  • Physical Change:

    Any change that alters the appearance of matter but DOES NOT make a different substance.

    Examples:

    Changing the state of matter  solid, liquid, gas

    Changes in shape or form  dissolving, blending, crushing, chopping, breaking


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Chemical Change

  • Chemical Change:

    A change in matter that produces NEW SUBSTANCES with properties different from those of the original substances.

    Bubbles are a sign of a chemical change…production of Carbon Dioxide

    Examples:

    Combustion  burning of wood, natural gas

    Oxidation  Rusting of iron

    Tarnishing  Tarnish on silverware


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  • What happens to a substance in a physical change?

    It changes form or appearance

  • Is dissolving sugar a physical change?

    Yes, if the water dries up, the sugar remains.

  • How does a chemical change differ from a physical change?

    Chemical change produces new substances different from those of the original substances.

    A  B + C

    D + E  F

  • When natural gas, or methane, combusts, what are the substances that combine? Is this a physical or chemical change?

    Methane mixes oxygen from the air. Creates CO2 & water. Chemical!


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Law of Conservation of Matter

  • Matter is never created or destroyed…it is simply changed.

  • Atoms are not lost or gained, just rearranged.


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