NEW
Font size
S
M
L
XL
WorksheetsCBA 4 Review
Total questions: 24
Worksheet time: 2hrs 46mins
Name
Class
Date
1.
What percent of magnesium bromide, MgBr2, is magnesium?
a)
13.99%
b)
86.8%
c)
7.58%
d)
13%
2.
What percent of CuCl2 is Cu?
a)
47.27%
b)
52.73%
c)
89.63%
d)
33%
3.
What percent of AgNO3 is silver?
a)
28.26%
b)
63.5%
c)
8.25%
d)
15.75%
4.
The percent composition, by mass, of nicotine is 74.1% C, 8.60% H and 17.3% N. The molar mass of nicotine is 81 g/mol. Determine the molecular mass of nicotine.
a)
C10H14N2
b)
C5H7N
c)
C17H43N4
d)
C20H28N4
5.
Based on the info below, solve for the molecular formula:
Empirical formula = NO
Molecular formula mass = 59.98g
Empirical formula = NO
Molecular formula mass = 59.98g
a)
NO
b)
N2O3
c)
N2O2
d)
N4O4
6.
What is the empirical formula for the following molecular formula: C6H14
a)
C6H14
b)
C3H7
c)
CH2
d)
CH3
7.
How many moles are in 88 g of propane, C3H8.
a)
2.0
b)
16.0
c)
0.051
d)
3,872
8.
What is the empirical formula for the following molecular formula: C5H12
a)
C5H12
b)
CH3
c)
CH2
d)
C2.5H6
9.
Which of the following dimensional analysis setups will correctly convert 27.76 g of Li to atoms of Li?
a)
A
b)
B
c)
C
d)
D
10.
Empirical formula
a)
is a formula that calculates the coefficients of a compound in a balanced equation.
b)
is the simplest whole-number ratio of moles of elements in the compound.
11.
Molar mass is in units of ________.
a)
grams
b)
grams/mole
c)
mole
d)
moles/gram
12.
Avogadro's number of representative particles is equal to one_____.
a)
kilogram
b)
gram
c)
kelvin
d)
mole
13.
What is the molar mass of water?
a)
18 grams/mole
b)
3 grams/mole
c)
2 grams/mole
14.
Which of the following dimensional analysis setups will correctly convert 2.50 moles of sodium to grams of sodium?
a)
A
b)
B
c)
C
d)
D
15.
Which compound has the smallest molar mass?
a)
CO
b)
CO2
c)
H2O
d)
H2O2
16.
How many molecules of sugar (C6H12O6) are in a mole?
a)
24 molecules
b)
180 molecules
c)
180 g
d)
6.02 x 1023 molecules
17.
2 KClO3 → 2 KCl + 3 O2
How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely?
How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely?
a)
6.7 mol
b)
1.0 mol
c)
10.1 mol
d)
4.5 mol
18.
CH4 + 2 O2 → CO2 + 2 H2O
How many moles of carbon dioxide are produced from the combustion of 110 g of CH4?
How many moles of carbon dioxide are produced from the combustion of 110 g of CH4?
a)
13.7 mol
b)
2.75 mol
c)
6.11 mol
d)
6.85 mol
19.
Mg(s) + 2 HCl(aq) --> MgCl₂(aq) + H₂(g)
How many moles of HCl are consumed in the production of 7.5 moles of MgCl₂?
How many moles of HCl are consumed in the production of 7.5 moles of MgCl₂?
a)
3.8 moles
b)
15 moles
c)
7.5 moles
d)
23 moles
20.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
21.
Which side of a chemical equation is the reactant side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
22.
Which side of a chemical equation os the product side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
23.
Balance this equation:
MgCl2 --> Mg4+ Cl2
MgCl2 --> Mg4+ Cl2
a)
It's already balanced.
b)
4MgCl2 --> Mg4+ 4Cl2
c)
4MgCl2 --> Mg4+ 5Cl2
24.
What is the Law of Conservation of mass?
a)
Mass is created in a chemical reaction
b)
Mass is created in a physical change
c)
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
d)
Mass is never created or destroyed
Reset
