A process in which two or more substances when mixed together produce one or more new substances.
When a chemical reaction occurs the products and reactants may have different properties you can observe
precipitate bubbles or fizz Examples:
different color change in temperature
It is likely a chemical reaction has occurred if you observe: 1.Gas formation 2.Precipitate formation 3.Change in color 4.Change in temperature
WARNING! Physical changes are not chemical reactions Physical changes include: melting, freezing, boiling, evaporating,dissolving Physical changes are reversible Chemical changes are NOT reversible Physical changes do not produce new substances
Chemicals to mix:Observations: Is there evidence a new substance formed? Is it likely that a chemical reaction took place? One: calcium chloride baking soda Water Two: Calcium chloride Citric acid water Three: Citric acid Baking soda water
Why is the Statue of Liberty green? Homework