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
Signs that a New Substance has Formed
Example: Yellow iodine and white starch react to form a new purple substance
Example: Milk spoils, and the new substance smells bad.
Example: Baking soda and vinegar react to form a new foaming gas, carbon dioxide.
Example: Lead Nitrate solution and Potassium Iodide solution react to form a new solid.
Example: Fireworks exploding release light, heat, and kinetic (sound) energy.