1. Quiz: March 8 Balance the following equations: K2O + H2O -> KOH
H2O2 -> H2O O2
H Br2 -> HBr
CS O2 -> CO SO2
Al CuCl2 -> Cu + AlCl3
Translate the following:
Sodium reacts with sulfur to produce sodium sulfide.
Calcium carbonate decomposes to form calcium oxide and carbon dioxide 2
2K, 2O, 2 H on each side 2 2 4
Reactants 2 O; Prod. 3 O 4 2 3 2 2 3 3 2 2
Na + S -> Na2S
CaCO3 -> CaO + CO2

2. Write the following equations and balance them.2 +
Cu+
OH 1-
Ca2+
Cl1-
1. copper (I) hydroxide reacts with calcium chloride to form copper (I) chloride and calcium hydroxide.
balance the charges!
( )2
Cu+
Cl1- +
OH 1-
Ca2+ 2
CuOH CaCl2 -> CuCl Ca(OH)2 2
balance the
equation
2. Barium hydroxide reacts with hydrochloric acid, HCl, to form barium chloride and water.
you try!
Ba(OH) HCl -> BaCl H2O
3. Iron (III) oxide is formed by the reaction of iron and oxygen.
4 Fe O2 -> Fe2O3

3. REVIEW: How many of each kind of atom are in the following compounds.
C and H
CH4
NaNO3
H2SO4
KCH3COO
Mg(OH)2
Al2(SO4)3 1 4
Na N O 3 1 1
H S O 4 2 1
K C H O
1+1 =2 2 1 3
Mg O H 1
1 x 2 =2
1x 2 = 2
Al S O 2
3 x 1 = 3
3 x 4 = 12

4. REVIEW. Basic Skills needed
Finding the gram formula mass
separate the elements
look up the atomic mass in the periodic table
figure out how many of each atom are in the formula
subtotal the masses of the elements
Find the total mass of the compound.
ex: Al2(SO4)3 2 3 12 Al S O
x 2
x 3
x 12
= 54
= 96
= 192 27 32 16
= 342g
mole

5. Review: Putting it all together:
What is the molar mass of chlorine, Cl2?
Balance the following equation:
CaCl Na3PO4 -> Ca3(PO4) NaCl
In the above equation, if we get 2 moles of NaCl, how many moles of CaCl2 would we have used?
In the above problem, how many grams of sodium chloride did we get?
How many grams of CaCl2 did we use?
2(35) = 70g/mole 3 3 2 6
mole of calcium chloride would be used.
= 58 g/mole NaCl
6 moles NaCl
58g NaCl
= 348 grams NaCl
1 mole NaCl
40 + 2(35) = 110g/mole
110 g CaCl2
3 mole CaCl2
= 330 grams CaCl2
1 mole CaCl2

6. Review: Stoichiometry (Chapter 9 Black Book)
READ and UNDERLINE important parts of the problem.
Write Balanced Formulas
+ = - ex: Ca2+ and P3- make Ca3P2 each having 6 charges
6+ balances out 6-
Write Balanced Equations
use coeficients to make atoms in reactants = same atoms in products
Find moles of “known”
Find moles of “unknown”
Make sure the questions are answered.

7. Review: What mass of Mg(OH)2 will react with 1.20 grams of HCl.
Mg(OH)2 + 2 HCl -> MgCl2 + 2 H2O 1 2
1.20 g
0.97 grams
 (36 g/mole HCl)
x 58g/mole
0.033 moles HCl
Mg = 24
2O = 32
2H = 2
= 58g/mole
0.017

8. Finish the Following for homework #32 p and 59,60 page 245 This was assigned about 1 month ago!
32. The compound “cisplatin” has been found to be effective in treating some types of cancer. It can be synthesized using the reaction on page 237 of your book.
a) How much “cisplatin” can be produced from 2.50 g PtCl2(NH3)2 and excess NH3. ?
b) How much NH3 is needed?
59. In the decomposition of sodium chlorate, 31.7 g of oxygen are formed. How many grams of sodium chloride are produced?
NaClO3 -> NaCl + O2 (unbalanced reaction)
60. The action of carbon monoxide on iron (III) oxide can be represented by Fe2O3 + 3 CO -> 2 Fe + 3 CO2. How much carbon monoxide is used if 57.5 g of iron were produced?
EXTRA CREDIT IF COMPLETED BEFORE CLASS
TOMORROW