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Review for the First Trimester Final Exam
1. Write the name of the following compounds.
a. HC2H3O2
Acetic acid
b. CoCO3 Cobalt II carbonate
c. NH3 Ammonia
d. H3PO4 Phosphoric Acid
2. Write the formula for each of the following compounds.
a. dinitrogen tetraoxide
N2O4
b. manganese(IV) sulfide Mn2S4
c. sodium hypochlorite NaClO
d. nitric acid HNO3
3. How many significant digits are in the following numbers?
a. .0012
2
b. 4002
4 c. 1.0023 5
d. 100.
3
4. Calculate the formula mass for:
a. CuSO4· 5H2O _________249.6_______________________
b. NH4C2H3O2 __________77.0________________________
5. Calculate the mass in grams for:
a. 2.80 moles Al(OH)3
2.80 mol Al(OH)3 │78.0 g Al(OH)3
│ 1 mol Al(OH)3
=
218.4 g Al(OH)3
b. 3.00 x 1024 molecules O2
3.00 x 1024 molecules O2│ __1 mol O2__________ │_32.0 g O2_ = 159 g O2
│6.02 x 1023 molecules O2 │1 mol O2
6. Find the percent of hydrogen in CaCl2· 6H2O.
12.12 g H
x 100
= 5.529 % H
219.22 g CaCl2· 6H2O
Review for the First Trimester Final Exam
7. Balance the following equation.
Cu +
4HNO3
Cu(NO3)2 +
2NO2 +
2H2O
8. Balance the following equation.
aluminum acetate + sodium hydroxide → aluminum hydroxide + sodium acetate
Al(C2H3O2)3 + 3NaOH → Al(OH)3 + 3NaC2H3O2
9. A compound is found to contain 27.87% phosphorous and 72.13% sulfur. The molecular
mass of the compound is 222.3 g. Calculate its molecular formula.
22.87 g P
1 mol P
31.0 g P
= 0.899 mol P
0.899
=1
72.13 g S
Empirical Formula: P2S5 formula mass
1 mol S
32.1 g S
= 2.25 mol S
0.899
= (222.5g) x = 222.3 g
222.5
222.5
= 2.5 x 2 = 5
x=1
Molecular formula: P2S5
10. Find the mass of iron in grams that could be obtained if you had 50.0 g of iron ore
that is found to be 30.0% FeO.
50.0 g Fe ore
30.0 g FeO
100.0g Fe Ore
55.8 g Fe
71.8 g FeO
= 11.7 g Fe
10. Review Polyatomic Ions (aka Radicals)
Name
phosphate
nitrate
acetate
bromate
fluorate
hydronium
Formula w/charge
-3
PO4
NO3-1
C2H3O2-1
BrO3-1
FO3-1
H3O+1
Name
Formula w/charge
sulfate
carbonate
hydroxide
iodate
chlorate
ammonium
SO4-2
CO3-2
OH-1
IO3-1
ClO3-1
NH4+1
11. List all the diatomic elements: H, O, N, Cl, Br, I, F
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