A process in which two or more substances when mixed together produce one or more new substances.

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Presentation transcript:

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