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Signs of a Chemical Change

Signs of a Chemical Change. Signs that a New Substance has Formed. Deanna Soukup. New Color. Example: Yellow iodine and w hite starch react to form a new purple s ubstance. New Odor. Example: Milk spoils, and the new substance smells bad. New Foaming or Fizzing Gas.

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Signs of a Chemical Change

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  1. Signs of a Chemical Change Signs that a New Substance has Formed Deanna Soukup

  2. New Color Example: Yellow iodine and white starch react to form a new purple substance

  3. New Odor Example: Milk spoils, and the new substance smells bad.

  4. New Foaming or Fizzing Gas Example: Baking soda and vinegar react to form a new foaming gas, carbon dioxide.

  5. Formation of New Precipitate Example: Lead Nitrate solution and Potassium Iodide solution react to form a new solid.

  6. Release of Energy Example: Fireworks exploding release light, heat, and kinetic (sound) energy.

  7. Credits: • http://www.visualphotos.com/image/1x7465698/iodine_used_to_detect_the_presence_of_starch • http://blog.gsmiweb.com/2011/04/new-packaging-materials-keep-you-from-crying-over-spoiled-milk/ • http://www.youtube.com/watch?v=zqhLa0Ei4B4 • http://www.sciencephoto.com/media/4011/enlarge • http://www.publicdomainpictures.net/view-image.php?image=403

  8. Question and Assignment: • What other real-life examples can you think of for chemical reactions that display each of the 5 signs of chemical reactions? • Create your own product that demonstrates your knowledge of all the signs of chemical change and examples of a reaction for each sign.

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