What is the balanced equation for the decomposition of

hydrogen peroxide into water and oxygen gas?

22HH22OO22 22HH22O + OO + O22

What does the abbreviation STP stand

for?

Standard Standard Temperature & Temperature &

Pressure Pressure

One mole of a compound contains how many

particles?

6.02x106.02x102323 particles particles

One mole of carbon has a mass of how many grams?

12 grams12 grams

6.02x1023 is also known as

Avagodro’s Avagodro’s NumberNumber

The sum of the masses of the elements composing a compound is known as its

Formula MassFormula Mass

One mole of any gas has what molar volume?

22.4 Liters22.4 Liters

The mass of each element in a compound divided by the formula mass is the

Percent Percent compositioncomposition

What is the percent composition of CO2?

%C = 12/44 = 27%%C = 12/44 = 27%

%O = 16(2)/44 = 73%%O = 16(2)/44 = 73%

Write the balanced formula for the reaction

of iron with oxygen gas to form iron (III) oxide.

44Fe + Fe + 33OO22 22FeFe22OO33

If 4.3g of iron reacts with oxygen, as in the previous

formula, what mass of Fe2O3 would be produced?

6.1 g Fe6.1 g Fe22OO33

4.3g Fe

1mol Fe

2mol Fe2O3

160g Fe2O3

56g Fe 4mol Fe 1mol Fe2O3

How many liters of oxygen are required for the previous reaction?

1.29 L O1.29 L O22

4.3g Fe

1mol Fe

3mol O2 22.4 L O2

56g Fe 4mol Fe 1mol O2

Aluminum reacts with bromine gas to produce

aluminum bromide. What is the balanced equation

for this reaction?

22Al + Al + 33BrBr22 22AlBrAlBr33

What type of reaction is the one previously

written? 22Al + Al + 33BrBr22 22AlBrAlBr33

Synthesis reactionSynthesis reaction

If 15.0g Al reacts with 46.0g Br2, which is the

limiting reactant?

46.0g Br46.0g Br22

15.0g Al 1mol Al 2mol AlBr3 267g AlBr3

27g Al 2mol Al 1mol AlBr3

46.0g Br2 1mol Br2 2mol AlBr3 267g AlBr3

160g Br2 3mol Br2 1mol AlBr3

= 51.2g

= 148.3g

Find the empirical formula for the compound that

consists of 20.23% Al and 79.77% Cl.

AlClAlCl33

20.23g Al 1mol Al = .75 mol Al

27g Al

79.77g Cl 1mol Cl = 2.28 mol Cl

35g Cl

.75

.75

= 1

= 3

If the molar mass of the compound in the previous question is 264g, what is the molecular formula?

AlAl22ClCl66AlClAlCl33 formula mass = 132 formula mass = 132

264/132 = 2264/132 = 2

For the formula 2P + 3Br2 2PBr3, if 5.0g P and 35g of Br2

react, what is the limiting reactant and how what mass of

PBr3 is produced?35g Br35g Br22 produces 39.5g produces 39.5g

PBrPBr33

5.0g P 1mol P 2mol PBr3 271g PBr3

31g P 2mol P 1mol PBr3

35g Br2

1mol Br2

2mol PBr3 271g PBr3

160g Br2

3mol Br2 1mol PBr3

= 43.7g

= 39.5g

If the actual yield of PBr3 from the previous

problem is 30g, what is the percent yield?

75.9%75.9%

30g/39.5g

In the writing of an ionic compound, how do we

determine the number of each atom in the

compound?Criss cross the Criss cross the ionic chargesionic charges

What law are we following when we balance a chemical equation?

Law of Law of Conservation of Conservation of

MassMass

Balance the following equation:

Ca(ClO3)2 CaCl2 + O2

Ca(ClOCa(ClO33))22 CaCl CaCl22 + + 33OO22

What is the formula for: iron (III) carbonate?

FeFe22(CO(CO33))33

Write the balanced equation for the following word

equation:

Aluminum chloride + Calcium Aluminum + Calcium chloride

22AlClAlCl33 + + 33Ca Ca 22Al + Al + 33CaClCaCl22