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Chapter#8:Chemical Equations & Reactions 1/11/2008
Section#1: Describing Chemical Reactions

Chemical Reaction- The process by which one or more substances change to produce one or more different substances.

Evidence Of A Chemical Reaction:
1. The release or absorption of energy in the form of heat, light, or sound.
2. If energy is released it is considered a product, if it is absorbed, it is considered a reactant.
3. The formation of a solid or gas without a change of state taking place.
4. A change in color, odor, or temperature.
5. A new substance is formed.

Chemical Equations

Reactant- A substance or molecule that participates in a chemical reaction.

Product- A substance that forms in a chemical reaction.

Example: 2H2 + O2 „³ 2H2
[Reactants] [Products]

= 6CO2 + 12H2O + Energy „³ C6H12O6 + 6H2O + 602
[Reactants] [Products]

Chemical Equation-A......

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