1. Introduction to Chemical Reactions
Learning Reaction Types and Their Patterns

2. Chemical Reactions

3. Synthesis A + B  AB Element A + Element B  Compound AB
Magnesium Strip + Oxygen Gas  Solid Magnesium Oxide

4. 2 Mg(s) + O2 (g)  2 MgO (s) (white powder)

5. Decomposition AB  A + B Compound AB  Element A + Element B
Aqueous hydrogen peroxide  oxygen gas + liquid water

6. Splint Test
A test used to determine the production of one of the following gases:
O2 – flame gets bigger and splint will relight
CO2 – flame will go out
H2 – popping noise
(flame may go out from mini explosion!)

7. 2 H2O2 (aq)  O2 (g) + 2 H2O (l)

8. ABCD  AB + C + D
Compound ABCD  Compound AB Element C + Element D
Solid ammonium dichromate  solid chromium (III) oxide + nitrogen gas + water vapor

9. ABCD  AB + C + D
Compound ABCD  Compound AB Element C + Element D
Solid ammonium dichromate  solid chromium (III) oxide + nitrogen gas + water vapor

10. (NH4)2Cr2O7 (s)  N2 (g) + Cr2O3 (s) + 4 H2O (g)

11. Single Replacement - Cationic
A + BC  B + AC
Element A+ Compound BC Element B+ Compound AC
Note: Elements A & B are metals
Copper wire + aqueous silver nitrate  solid silver + aqueous copper (I) nitrate

12. Cu(s) + AgNO3 (aq)  Ag(s) + CuNO3 (aq) (blue)

13. Iron nail + copper (II) chloride solution  solid copper + iron (II) chloride solution

14. Fe(s) + CuCl2 (aq)  FeCl2 (aq) + Cu (s) (red)

15. Solid zinc + aqueous hydrochloric acid  hydrogen gas + aqueous zinc chloride

16. Zn(s) + 2HCl(aq)  ZnCl2 (aq) + H2 (g) (“pop” splint test)

17. Single Replacement - Anionic
A + BC  C + BA
Element A + Compound BC  Element C + Compound BA
Note: Elements A & C are nonmetals

18. Chlorine gas + aluminum bromide solution  bromine gas + aluminum chloride solution

19. 3Cl2 (g) + 2AlBr3 (aq)  3Br2 (g) + 2AlCl3 (aq)

20. Double Replacement AB + CD  AD + CB
Compound AB + Compound CD  Compound AD + Compound BC
aqueous copper (II) nitrate + aqueous sodium hydroxide  copper (II) hydroxide (ppt) + aqueous sodium nitrate.

21. Cu (NO3)2 (aq) + 2 NaOH (aq)  Cu (OH)2 (s) + 2 NaNO3 (aq)

22. aqueous silver nitrate + potassium chromate  aqueous potassium nitrate + solid silver chromate

23. AgNO3 (aq) + K2CrO4 (aq)  KNO3 (aq) + Ag2CrO4 (s)

24. In order for a double replacement reaction to occur, one of the following must be produced:
Gas
Water
Precipitate (ppt.)

25. Precipitation Animation

26. Combustion Hydrocarbon + oxygen  carbon dioxide + water + heat
Hydrocarbon is a compound containing carbon, hydrogen and sometimes oxygen (CxHyOz)
aqueous methanol + oxygen gas  carbon dioxide gas + liquid water

27. 2 CH3OH(aq) + 3 O2 (g)  2 CO2 (g) +
4 H2O (l) + heat

28. methane gas + oxygen gas  carbon dioxide gas + water vapor

29. CH4 (g) + 2O2 (g)  CO2 (g) + 2H2O(g)