1. Chemical reactions can be classified into 4 types:
Synthesis Reactions
Decomposition reactions
Single Displacement Reactions
Double Displacement Reactions

2. unite to form one compound
Synthesis Reaction:
two or more elements
unite to form one compound
C + O  CO 2 2
2H + O  2H O 2 2 2
2K + Cl  2KCl 2

3. Decomposition Reaction: substance into 2 or more other substances
the breakdown of 1
substance into 2 or more other substances
2H O  2H O 2 2 2
BaCl  Ba Cl 2 2
MgCl  Mg + Cl 2 2

4. What do you notice about synthesis and decomposition reactions?

5. Single Displacement Reaction:
1 element replaces
Single Displacement Reaction:
another in a compound
BeF Mg  MgF Be 2 2
2KBr + Cl  2KCl + Br 2 2
2NaBr Cl  2NaCl + Br 2 2

6. Double Displacement Reaction: the positive
ions in 2 or more substances trade places
AgNO NaCl  AgCl + NaNO 3 3
BaCl Na SO  BaSO NaCl 2 2 4 4
H S HgCl  HgS HCl 2 2

7. 3KOH + AlCl  Al(OH) + 3KCl 2HgO  2Hg + O SO + H O  H SO
Now try these:
3KOH AlCl  Al(OH) KCl 3 3
2HgO  2Hg + O 2
SO H O  H SO 3 2 2 4
CaBr Cl  CaCl Br 2 2 2 2

8. 2KClO  2KCl + 3O CaBr + NaCO  CaCO + 2NaBr Zn + S  ZnS
2Li FeBr  2LiBr Fe 2

9. CLASSIFYING CHEMICAL REACTIONS WORKSHEET
KClO  2KCl O 2 3
HCl NaOH  NaCl + H O 2
Mg HCl  MgCl + H 2 2
H O  2H O 2 2 2
2Al NiBr  2AlBr Ni 5. 2 2

10. 8. CaCl + F  CaF + Cl 6. 4Al + 3O  2Al O 7. 2NaCl  2Na + Cl 9.
AgNO KCl  AgCl KNO 3 3
10.
N H  2NH 2 2 3

11. (NH ) SO + Ba(NO )  BaSO + 2NH NO
11.
2H O  2H O O 2 2 2
12.
(NH ) SO Ba(NO )  BaSO NH NO 4 4 3 3 2 2 4 4
13.
MgI + Br  MgBr I 2 2 2 2
14.
SO + H O  H SO 3 2 2 4
15.
6KCl Zn (PO )  3ZnCl + 2K PO 3 4 2 2 3 4