11/18/08
Post date: Nov 18, 2008 2:28:23 AM
Bell Activity: How can you tell if a chemical change has occurred?
Signs of a chemical change
Different color
Gas is produced
A precipitant is formed
Each sign indicates a new substance is present
Observations
Ice melting
Baking soda and vinegar
Milk and lemon juice
Food coloring and water
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