Chemistry Final Review

Balance the Equation

100

__Al+__S→__Al2S3

2Al+3S→1Al2S3

200

__Ca+__H2O→__Ca(OH)2+__H2

1Ca+2H2O→1Ca(OH)2+1H2

300

__CaCO3→__CaO+__CO2

1CaCO3→1CaO+1CO2

400

__BaCO3→__BaO+__CO2

1BaCO3→1BaO+1CO2

500

__Li+__N2→__Li3N

6Li+1N2→2Li3N

Name the Compound

100

Fe2O3

Iron (III) Oxide

200

N2O5

Dinitrogen Pentoxide

300

The formula of beryllium chloride is:

BeCl2

400

The prefix hepta = ---------------- atoms.

7

500

SO3  

Sulfur Trioxide

Polyatomic Ions

100

Sulfate

SO4(2-)

200

Sulfite

SO3(2-)

300

Ammonium

NH4(+)

400

Cyanide

CN(-)

500

Peroxide

O2(2-)

Oxidation Numbers

100

Oxidation number of oxygen (O) in SO2

-2

200

Oxidation number of potassium (K) in K2Cr2O7

+1

300

Oxidation number of chlorine (Cl) in NaClO3

+5

400

Oxidation number of phosphorus (P) in H3PO4

+5

500

Oxidation number of the carbon (C) in C6H12O6

0

Empirical Formula

100

Molar Mass of H2O
*only 5 seconds*

18 g/mol

200

Formula Mass of C6H12O6

180 u

300

Molar Mass HClO3 

84.46 g/mol

400

Formula Mass of MnO4(–)

118.94 u or 119 u

500

Calculate the percentage composition of sodium nitrate, NaNO3 

*no time limit*

Na = (23 ÷ 85) ×100 = 27.06% 

N = (14 ÷ 85) ×100 = 16.47% 

O = (48 ÷ 85) ×100 = 56.47%