1. Unit 7 – Chemical Reactions Ch 11.2 pages 330-336
Types of Reactions
Unit 7 – Chemical Reactions
Ch 11.2 pages

2. 5 types of Chemical Reaction
1. Synthesis: (aka. Combination)
Jane goes to the school dance
Jane meets Bob there
They start dating
ex. The combination of iron and sulfur to form iron (II) sulfide
8 Fe + S8  8 FeS

3. 5 types of Chemical Reaction
2. Decomposition:
Jane and Bob have “issues”
Jane and Bob break up
ex. The electrolysis of water to make oxygen and hydrogen gas:
2 H2O  2 H2 + O2

4. 5 types of Chemical Reaction
3. Single Replacement:
Jane and Bob are dating.
ex: Aluminum replaces Zinc in Zinc (II) chloride to make Aluminum chloride and Zinc:
Al + ZnCl2  Zn + AlCl3
They meet Steve.
Steve steals Jane from Bob, leaving Bob alone

5. 5 types of Chemical Reaction
4. Double Replacement:
Jane and Bob are dating
Steve and Marcie are dating
They break up and swap partners
ex: Reaction of lead nitrate with potassium iodide to form lead iodide and potassium nitrate:
Pb(NO3)2 + 2 KI  PbI2 + 2 KNO3

6. 5 types of Chemical Reaction
Combustion:
Carbon/Hydrogen source + O2CO2 + H20 CO C
Exothermic (produces heat/energy)
You are a “carbon based” molecule
Breathe in – adds oxygen
Digest food – burns/releases energy
Breathe out – waste of carbon dioxide and water or or

7. Identifying Reaction Types
Identify what type the following reactions are:
NaOH + KNO3  NaNO3 + KOH
CH4 + 2 O2  CO2 + 2 H2O
2 Fe + 6 NaBr  2 FeBr3 + 6 Na
CaSO4 + Mg(OH)2  Ca(OH)2 + MgSO4
Pb + O2  PbO2
Na2CO3  Na2O + CO2
Double Repl.
Combust.
Single Repl.
Double
Synth
Decomp.

8. Identify Reaction Types + Balance
Al + HCl  AlCl3 + H2
KClO3  KCl + O2
Pb(NO3)2 + KI  PbI2 + KNO3
Single Replacement
2Al + 6HCl  2AlCl3 + 3H2
Decomposition
2KClO3  2KCl + 3O2
Double Replacement
Pb(NO3)2 + 2KI  PbI2 + 2KNO3

9. Identify Reaction Types + Balance
Ethanol (CH3CH2OH) reacts with oxygen to produce carbon dioxide and water.
Ammonia sulfide and cobalt (II) nitrate react to produce cobalt (II) sulfide and ammonia nitrate.
Combustion
CH3CH2OH + 3O2  2CO2 + 3H2O
Double Replacement
(NH4)2S + Co(NO3)2  CoS + 2NH4NO3