1. Chemical Reactions Lab

2. A. Synthesis (Combination)
A1: Magnesium combines with oxygen.

3. Mg + O2 → MgO

4. Magnesium (Mg)

6. Mg reaction with oxygen

7. B1: Hydrogen Peroxide (H2O2) decomposes.
B. Decomposition
B1: Hydrogen Peroxide (H2O2) decomposes.

8. Hydrogen Peroxide

9. H2O2 → H2 + O2
This reaction occurs very slowly and so we use a catalyst to speed up the reaction.
Catalysts are chemicals.
MnO2 will be used as a catalyst in this reaction
Catalysts are written above the arrow in a chemical equation.

10. MnO2 Catalyst

11. Test for O2
Insert a “glowing” splint. If it relights then O2 is present.

12. Hydrogen will explode when exposed to a flame
Test for H2
Hydrogen will explode when exposed to a flame

13. B2: Copper(II) Carbonate decomposes when heated.
B. Decomposition
B2: Copper(II) Carbonate decomposes when heated.

14. CuCO3 → CuO + CO2

15. Copper(II) Carbonate

16. Copper(II) Oxide

18. Limewater Test for CO2
Lime water will turn cloudy when CO2 is bubbled through it.

19. Combustion
B3: Methane is burned
CH4 + O2 → CO2 + H2O

20. CH4 + O2 → CO2 + H2O

21. C. Single Replacement
C1: Zinc is added to Hydrochloric acid (HCl)

22. Zn + HCl → H2 + ZnCl2

23. Zinc Hydrochloric Acid

24. Highly Exothermic

25. ZnCl2 is a clear solution however due to impurities in the zinc it may appear as a grayish solution with black specks.

26. Synthesis (Combination)
C2: Hydrogen and Oxygen Gas Combine
Test for Hydrogen (Explosion)

27. H2 + O2 → H2O

28. C. Single Replacement
C3: Aluminum metal is added to a solution of copper(II) chloride.

29. Al + CuCl2(aq) → Cu + AlCl3(aq)

30. Aluminum CuCl2(aq)

31. Al + CuCl2(aq) → Cu + AlCl3(aq)

32. D. Double Replacement
D1: Solutions of sodium iodide and lead(II) nitrate are mixed.

33. Precipitate Formation
NaI(aq) + Pb(NO3)2(aq) → NaNO3(aq) + PbI2↓

35. PbI2 Precipitate

36. D. Double Replacement
D2: Solutions of silver nitrate and sodium chromate are mixed.

37. Precipitate Formation
AgNO3(aq) + Na2CrO4(aq) →
NaNO3(aq) + Ag2CrO4↓

39. Ag2CrO4 Precipitate

40. Homework
Lab Summary for the “Chemical Reactions Lab” due tomorrow.