Chemical properties-and-changes

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Chemical properties-and-changes

  1. 1. Chemical Properties and Changes
  2. 2. Do you remember what Physical Properties are??? <ul><li>Color </li></ul><ul><li>Shape </li></ul><ul><li>Mass </li></ul><ul><li>State of Matter </li></ul><ul><li>Length </li></ul><ul><li>Magnetism </li></ul>
  3. 3. Chemical Properties determine how a substance interacts with other substances Some examples are: *flammability *reactivity to an acid *reactivity to water
  4. 4. After a PHYSICAL CHANGE, the appearance of the substance may be different but it is still the same substance <ul><li>EXAMPLES: </li></ul><ul><li>Cutting a steak </li></ul><ul><li>Cracking an egg </li></ul><ul><li>Chopping wood </li></ul><ul><li>Bending a metal </li></ul><ul><li>Tearing paper </li></ul>
  5. 5. After a CHEMICAL CHANGE, a new substance is produced with NEW PROPERTIES. These properties are different from the original substance! <ul><li>EXAMPLES: </li></ul><ul><li>Burning wood </li></ul><ul><li>Frying an egg </li></ul><ul><li>Digesting a steak </li></ul><ul><li>Rusting of metal </li></ul>
  6. 6. <ul><li>Here are some signs that a CHEMICAL CHANGE took place: </li></ul><ul><li>New color </li></ul><ul><li>New odor or smell </li></ul><ul><li>Gas bubbles or smoke </li></ul><ul><li>An increase or decrease in temperature </li></ul>
  7. 7. Physical or Chemical??? Use the A-F cards to separate the Physical Changes from the Chemical Changes! A. You cut a sheet of aluminum foil in half B. Your friend melts some butter for her popcorn C. Your Mom lights a candle in a dark room D. Rubbing alcohol evaporates from your hand E. Hydrogen peroxide bubbles when you put it on a cut on your leg F. You leave the milk on the counter all night and discover it has soured in the morning

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