Signs of a

Signs of a Chemical ChangeSigns that a New Substance has FormedDeanna SoukupNew ColorExample: Yellow iodine and white starch react to form a new purple substance

New OdorExample: Milk spoils, and the new substance smells bad.

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

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

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

Credits:http://www.visualphotos.com/image/1x7465698/iodine_used_to_detect_the_presence_of_starchhttp://blog.gsmiweb.com/2011/04/new-packaging-materials-keep-you-from-crying-over-spoiled-milk/http://www.youtube.com/watch?v=zqhLa0Ei4B4http://www.sciencephoto.com/media/4011/enlargehttp://www.publicdomainpictures.net/view-image.php?image=403

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.