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Changes in Matter

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  1. Changes in Matter Chapter 2 Section 2

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

  3. 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

  4. 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!

  5. Law of Conservation of Matter • Matter is never created or destroyed…it is simply changed. • Atoms are not lost or gained, just rearranged.