1. Review Chemical Equations
May 16, 2016

2. Success Stories DPS

3. How do you know when a chemical change has occurred?
Temperature change
Color change
Release of a gas
Precipitation

4. Chemical Reactions
Chemical Reactions are represented by balanced equations
There are four main types of reactions
Synthesis
Decomposition
Replacement
Combustion
Reactions in Aqueous solutions
Double replacement reactions occur between substances in aqueous solutions and produce precipitates, water, or gases

5. Synthesis Reactions

6. Combustion Reaction Combustion as well as a synthesis reaction
Combustion but not a synthesis reaction

7. Decomposition Reaction
2NaN3 (s) Na(s) N2 (g)
Sodium azide Sodium Nitrogen gas

8. Replacement Reactions

9. Symbols
(s) = solid (g) = gas (aq) = aqueous (a solution in water) Yields (reacts to from)

10. Representing a chemical reaction
Word equation
Reactant1 + Reactant2 Product1 + Product2
Aluminum + Bromine Aluminum Bromide
Skeletal Equation
Al(s) + Br2(g) AlBr3
Balanced Chemical Equation
2Al(s) + 3Br2(g) 2AlBr3

11. Exit Questions Write the chemical equation for the following reactions
Hydrogen and Bromine gases react to yield hydrogen bromide.
When carbon dioxide and oxygen react, carbon dioxide forms
Extra credit challenge:
Write the word equation and the skeleton equation for the following reaction.
When heated, solid potassium chlorate yields solid potassium chloride and oxygen gas.

12. Writing a balanced Chemical Equation
NaOH(aq) + CaBr2(aq) Ca(OH)2 + NaBr(aq)