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WHAT MAKES IT CHEMICAL?

WHAT MAKES IT CHEMICAL?. Review:. Chemical Changes. Mixtures and solutions are formed through physical changes  compounds are formed through chemical changes A compound is a combination of two or more substances that are chemically combined. Chemical Properties.

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WHAT MAKES IT CHEMICAL?

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  1. WHAT MAKES IT CHEMICAL?

  2. Review: Chemical Changes Mixtures and solutions are formed through physical changes compounds are formed through chemical changes A compound is a combination of two or more substances that are chemically combined Chemical Properties • Related to internal makeup of substances • Describe how a substance reacts with other substances to form new substances

  3. Signs of a Chemical Change 1. A Color Change A chemical reaction in trees causes the leave to change colors

  4. Signs of a Chemical Change 2. Something Smells When substance undergo a chemical change, often a new substance that smells different than the original substances is produced. Ex. Rotting meat or sour milk

  5. Signs of a Chemical Change 3. The Presence of Bubbles or Frizzing The appearance of bubbles or fuzzing means that a gas is being produced Ex. Vinegar and Baking Soda produce Carbon Dioxide

  6. Signs of a Chemical Change 4. Light is Given Off When a glow stick is bent, a capsule inside breaks, causing the chemicals within the capsule and the stick to react and give off light.

  7. Signs of a Chemical Change 5. A Change in Temperature Burning is a chemical reaction that releases heat energy Photosynthesis is a chemical reaction that absorbs heat energy from the sun.

  8. Signs of a Chemical Change 6. A Precipitate Forms In some chemical changes, two liquids react and form a new liquid and a solid (precipitate).

  9. Signs of a Chemical Change 7. It’s Permanent A chemical change is very difficult or impossible to reverse. Ex. Once you bake a change, you can never change the cake to batter

  10. CAUTION Although most of these signs indicate a chemical change, there are exceptions to the rule. Boiling water produces water bubbles but this is a PHYSICAL change Adding food coloring to water results in a color change, but it’s just a PHYSICAL change.

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