Signs of a chemical change
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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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Signs of a chemical change

Signs of a Chemical Change

Signs that a New Substance has Formed

Deanna Soukup


New color

New Color

Example: Yellow iodine and white starch react to form a new purple substance


New odor

New Odor

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


New foaming or fizzing gas

New Foaming or Fizzing Gas

Example: Baking soda and vinegar react to form a new foaming gas, carbon dioxide.


Formation of new precipitate

Formation of New Precipitate

Example: Lead Nitrate solution and Potassium Iodide solution react to form a new solid.


Release of energy

Release of Energy

Example: Fireworks exploding release light, heat, and kinetic (sound) energy.


Credits

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


Question and assignment

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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