H CH 9 Homework
1. iron + sulfur  iron (II) sulfide
2. silver nitrate + sodium bromide  sodium nitrate + silver bromide
3. potassium chlorate  potassium chloride + oxygen
4. butane (C4H10) + oxygen  carbon dioxide + water
5. potassium iodide + lead (II) nitrate  lead (II) iodide + potassium nitrate
6. aluminum + oxygen  aluminum oxide
7. magnesium chloride + ammonium nitrate  magnesium nitrate + ammonium
chloride
8. sodium peroxide + water  sodium hydroxide + oxygen
9. ferric chloride + potassium hydroxide  potassium chloride + ferric hydroxide
10. aluminum + sulfuric acid  aluminum sulfate + hydrogen
11. sodium carbonate + calcium hydroxide  sodium hydroxide + calcium carbonate
12. carbon dioxide + water  carbonic acid
13. sodium + water  sodium hydroxide + hydrogen
14. zinc + sulfuric acid  zinc sulfate + hydrogen
15. aluminum sulfate + calcium hydroxide  calcium sulfate + aluminum hydroxide
16. calcium oxide + water  calcium hydroxide
17. iron + cuprous nitrate  ferrous nitrate + copper
18. iron (II) sulfide + hydrochloric acid  hydrogen sulfide + iron (II) chloride
19. potassium oxide + water  potassium hydroxide
20. octane (C8H18) + oxygen  carbon dioxide + water
21. potassium hydroxide + phosphoric acid  potassium phosphate + water
22. calcium chloride + nitric acid  calcium nitrate + hydrochloric acid
23. magnesium hydroxide + sulfuric acid  magnesium sulfate + water
24. phosphorous + oxygen  phosphorous pentoxide
25. sodium carbonate + hydrochloric acid  sodium chloride + water + carbon
dioxide
26. magnesium + nitric acid  magnesium nitrate + hydrogen
27. calcium carbonate  calcium oxide + carbon dioxide
28. ammonia (NH3) + sulfuric acid  ammonium sulfate
29. magnesium chloride + fluorine  magnesium fluoride + chlorine
30. fluorine + sodium hydroxide  sodium fluoride + oxygen + water
Now, try these!!!
1. ZnSO4 + KI + KIO3 + H2O  Zn5(OH)8SO4 + K2SO4 + I2
2. K2SeO3 + KI + HCl  KCl + Se + I2 + H2O
3. KIO3 + KI + HCl  KCl + I2 + H2O
4. FeCl2 + K2Cr2O7 + HCl  FeCl3 + KCl + CrCl3 + H2O
5. Cr2(SO4)3 + KMnO4 + H2O  H2CrO4 + MnSO4 + K2SO4 + H2SO4
6. HBO2 + KIO3 + KI  KBO2 + H2O + I2
Now try the MOTHER of ALL balancing problems:
[Cr(N2H4CO)6]4[Cr(CN)6]3 + KMnO4 + H2SO4  K2Cr2O7 + MnSO4 + CO2 +
KNO3 + K2SO4 + H2O
Oxidation/Reduction:
Identify the species in each reaction that have been oxidized and reduced and write the
half reaction.
1. FeCl3 + SnCl2  FeCl2 + SnCl4
2. SbCl5 + KI  SbCl3 + KCl + I2
3. CdS + I2 + HCl  CdCl2 + HI + S
4. H2SO3 + I2 + H2O  H2SO4 + HI
5. NaClO + H2S  NaCl + H2SO4
Reaction Prediction:
Identify the type of reaction, predict the products, balance the equation, and tell if the
reaction will take place or not.
1. aluminum + hydrochloric acid 
2. calcium hydroxide + nitric acid 
3. methane (CH4) + oxygen 
4. aluminum + oxygen 
5. zinc chloride + hydrogen sulfide 
6. dinitrogen pentoxide + water 
7. silver chloride + bromine 
8. sodium chlorate 
9. barium nitrate + sodium chromate 
10. zinc carbonate 
11. calcium phosphate + aluminum sulfate 
12. potassium + fluorine 
13. copper + sulfuric acid 
14. lithium oxide + water 
15. strontium chloride (electrolyzed) 
16. magnesium carbonate + phosphoric acid 
17. propane (C3H8) + oxygen 
18. lead + potassium chlorate 
19. calcium carbonate + lithium chloride 
20. potassium nitrate 
21. calcium + oxygen 
22. potassium hydroxide + sulfuric acid 
23. calcium + aluminum chloride 
24. potassium sulfide + iron (II) nitrate 
25. sulfur dioxide + water 
26. lithium sulfide (dissociated) 
27. calcium + water 
28. sodium + nitric acid 
29. barium oxide 
30. stannous sulfate + copper 
Alpha/Beta Decay:
U92238
Undergoes  decay and becomes
Th90234
Undergoes  decay and becomes
Undergoes  decay and becomes
Undergoes  decay and becomes
Undergoes  decay and becomes
Undergoes  decay and becomes
Rn86222
Undergoes  decay and becomes
Undergoes  decay and becomes
Undergoes  decay and becomes
Undergoes  decay and becomes
Undergoes  decay and becomes
Undergoes  decay and becomes
Bi83210
Undergoes  decay and becomes
Undergoes  decay and becomes
Which is stable.
Half-Life Calculations:
1. 64 g of a substance decays for 4 half-lives. How much of the original substance is
left?
2. Plutonium-236 has a half-life of roughly 2 years. 32 g of it decay over a period of
8 years. How much of the original sample is left?
3. How long will it take 60 g of a substance to decay to 3.8 g if the half-life is 4.3 x
106 years?
4. Molybdenum-91 has a half-life of 15.49 minutes. After 40 minutes 1 g of it
remains. What was the mass of the original sample?
5. 64 g of a substance decays to 1 g in 18 minutes. What is the half-life of the
substance.
CH 8 Review:
1. What things can you do to initiate or increase the rate of a reaction?
2. What is a catalyst?
3. Draw Lewis structures to illustrate the reaction on page 1 #12.
4. Why does alpha decay result in the loss in mass of 4 units and change in the
identity of the element?
5. How are electrons produced during beta decay?
6. Why do you write water as HOH on the reactant side?