NEW
Font size
S
M
L
XL
WorksheetsChemistry CBA 4 Review
Total questions: 20
Worksheet time: 1hrs 3mins
Name
Class
Date
1.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
2.
Balance this equation:
MgCl2 --> Mg4+ Cl2
MgCl2 --> Mg4+ Cl2
a)
It's already balanced.
b)
4MgCl2 --> Mg4+ 4Cl2
c)
4MgCl2 --> Mg4+ 5Cl2
3.
Balance this equation-
_SeCl6+_O2>_SeO2+_Cl2
_SeCl6+_O2>_SeO2+_Cl2
a)
1,2,1,2
b)
1,1,1,3
c)
1,2,1,1
d)
2,1,1,1
4.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
5.
What are the units for molar mass?
a)
grams
b)
amu
c)
grams/mole
d)
liters
6.
How many moles are in a 18 L tank of nitrogen gas at STP?
a)
0.9 moles
b)
1 mole
c)
0.8 moles
d)
0.75 moles
7.
% of Ca in Ca(CN)2
a)
60.6% Ca
b)
43.5% Ca
c)
50.0% Ca
d)
75.5% Ca
8.
How many atoms are in 1.50 moles of Hg?
a)
9.03x1023 atoms Hg
b)
9.03x1024 atoms Hg
c)
903 atoms of Hg
d)
9.03 atoms of Hg
9.
2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)
12.00 moles of NaClO3 will produce how many grams of O2?
12.00 moles of NaClO3 will produce how many grams of O2?
a)
256 g of O2
b)
576 g of O2
c)
288 g O2
10.
2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)
16.5 grams of NaClO3 will produce how many moles of O2?
16.5 grams of NaClO3 will produce how many moles of O2?
a)
0.45 moles
b)
2634.39 moles
c)
0.23 moles
d)
4362.47 moles
11.
What is the molar mass of CH4
a)
16.05
b)
16.04
c)
16.03
d)
16.02
12.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
13.
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?
How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?
a)
0.85 g
b)
290 g
c)
450 g
d)
870 g
14.
How many liters of NH3 are needed to react completely with 30.0L of NO?
4NH3+6NO --> 5N2 + 6H2O
4NH3+6NO --> 5N2 + 6H2O
a)
5.0 L
b)
20.0 L
c)
7.5 L
d)
120.0 L
15.
4 Al + 3 O2 –> 2 Al2O3 How much aluminum would be needed to completely react with 45 grams of O2?
a)
1.05 moles
b)
3.75 moles
c)
1.2 grams
d)
1.875 moles
16.
4 Al + 3 O2 –> 2 Al2O3 How many atoms of aluminum would be needed to completely react with 45 grams of O2?
a)
1.45 x 1019
b)
1.13 x 1024
17.
4KClO3 --> 3KClO4 + KCl
How many grams of KCl will be created when 19.2 moles of KClO3 are used up?
How many grams of KCl will be created when 19.2 moles of KClO3 are used up?
a)
5725.4 g
b)
354.84 g
c)
1431.0 g
d)
74.55 g
18.
2CO + O2 −-> 2CO2
How many liters of carbon dioxide are produced from 10L of carbon monoxide?
How many liters of carbon dioxide are produced from 10L of carbon monoxide?
a)
10
b)
20
c)
1
d)
5
19.
How many grams are in .54 moles of Carbon?
a)
.045 g
b)
6.02 x 10 ^ 23 g
c)
6.5 g
d)
.026 g
20.
What is the percent of KI is potassium?
a)
28.65%
b)
39%
c)
76.45%
d)
23.55%
Reset
