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

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

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

What do you notice about synthesis and decomposition reactions?

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

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

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

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

CLASSIFYING CHEMICAL REACTIONS WORKSHEET 1. 2KClO  2KCl + 3O 2 3 2. HCl + NaOH  NaCl + H O 2 3. Mg + 2HCl  MgCl + H 2 2 4. 2H + O  2H O 2 2 2 2Al + 3NiBr  2AlBr + 3Ni 5. 2 2

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

(NH ) SO + Ba(NO )  BaSO + 2NH NO 11. 2H O  2H O + O 2 2 2 12. (NH ) SO + Ba(NO )  BaSO + 2NH 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