chemistry chapter 7 notes outline by IARZh3

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									7.1-7.2 notes
Signals of a chemical reaction

1.exothermic-
2.endothermic-

Chemical equations
Chemical reaction-
Chemical equations-

Reactants  products
*in a chemical reactions:

 -we must have the same number of
atoms on both sides when we balance a
chemical equation


s=
l=
g=
aq=
EX: H2O(g)=water vapor
Example equation
2K(s) + 2H2O(l)  H2(g) + 2KOH(AQ)

7.3 balancing chemical equations
General Rules/Advice
-principle that lies at the heart of
balancing chemical equations is:

Trial and error method:


Steps
1.read description and write
appropriate formulas
2.write the unbalanced equation
3.balance by starting with the most
complicated molecule
(most of the time)
Examples: add coefficients
HgO  Hg + O2

Al +O2  Al2O3

								
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