Chem 051 - Fundamentals of Chemistry » Winter 2021 » GOB Homework Week 2
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Question #1
Calculate the molar mass of potassium chloride, KCl.
A.
19.0 g
B.
67.4 g
C.
54.5 g
D.
6.74 g
E.
74.6 g
Question #2
The molar mass of silver is 47 g.
A.
TRUE
B.
FALSE
Question #3
For the following question(s), consider the following equation. 2Mg + O2 → 2MgO The number of moles of oxygen gas needed to react with 4.0 moles of Mg is
A.
1.0 mole.
B.
3.0 moles.
C.
2.0 moles.
D.
4.0 moles.
E.
6.0 moles.
Question #4
In this reaction, what is the coefficient for calcium oxide? CaO + CO2 → CaCO3
A.
2
B.
3
C.
5
D.
1
E.
4
Question #5
One mole of copper(II) sulfate, CuSO4, contains ________ O atoms.
A.
6.02 x 1023
B.
4
C.
2.41 x 1024
D.
1.51 x 1023
E.
2.41 x 1023
Question #6
Avogadro's number is the number of grams in a mole.
A.
FALSE
B.
TRUE
Question #7
What type of reaction is: CH4 + 2O2 → CO2 + 2H2O + 218 kcal ?
A.
a combination reaction
B.
a single replacement reaction
C.
an exothermic reaction
D.
a decomposition reaction
E.
an endothermic reaction
Question #8
The following reaction takes place when an electric current is passed through water. It is an example of a ________ reaction. 2H2O electricity 2H2 + O2
A.
combustion
B.
decomposition
C.
single replacement
D.
combination
E.
double replacement
Question #9
The following is a double replacement reaction. 2C2H2 + 5O2 → 4CO2 + 2H2O
A.
FALSE
B.
TRUE
Question #10
In this reaction, what is the substance oxidized? Zn + 2 HCl → ZnCl2 + H2
A.
zinc
B.
oxygen
C.
zinc chloride
D.
hydrogen
E.
chlorine
Question #11
One mole of helium gas weighs
A.
4.00 g.
B.
1.00 g.
C.
8.00 g.
D.
2.00 g.
E.
3.00 g.
Question #12
The molar mass of calcium hydroxide, Ca(OH)2, is
A.
57.1 g.
B.
58.1 g.
C.
74.1 g.
D.
38.0 g.
E.
114.2 g.
Question #13
For the following question(s), consider the following balanced equation. Mg3N2 + 6H2O → 3Mg(OH)2 + 2NH3 When 36.0 g of H2O react, how many grams of NH3 are produced?
A.
11.3 g
B.
10.0 g
C.
34.0 g
D.
102 g
E.
5.67 g
Question #14
In the reaction of silver nitrate with sodium chloride, how many grams of silver chloride will be produced from 100. g of silver nitrate when it is mixed with an excess of sodium chloride? The equation for the reaction is below. AgNO3 + NaCl → AgCl + NaNO3
A.
0.589 g
B.
169.9 g
C.
58.9 g
D.
107.9 g
E.
84.4 g
Question #15
How many grams of NO are required to produce 145 g of N2 in the following reaction? 4NH3 + 6NO → 5N2 + 6H2O
A.
145 g
B.
155 g
C.
186 g
D.
129 g
E.
125 g
Question #16
How many grams of hydrogen are needed to produce 1.80 g of water according to this equation? 2H2 + O2 → 2H2O
A.
0.101 g
B.
0.180 g
C.
2.02 g
D.
4.04 g
E.
0.202 g
Question #17
The molar mass of chlorine gas is 35.5 g.
A.
TRUE
B.
FALSE
Question #18
How many moles of carbon atoms are there in 0.500 mole of C2H6?
A.
0.500 mole
B.
3.00 moles
C.
6.02 x 1023 moles
D.
1.00 mole
E.
4.00 moles
Question #19
How many moles of K2SO4 are in 15.0 g of K2SO4?
A.
0.119 moles
B.
0.172 moles
C.
0.0861 moles
D.
2.61 x 103 moles
E.
0.111 moles
Question #20
What is the classification for this reaction? SO3 + H2O → H2SO4
A.
decomposition
B.
combination
C.
combustion
D.
double replacement
E.
replacement
Question #21
In a ________ reaction, two or more elements or compounds form one product.
A.
single replacement
B.
combination
C.
double replacement
D.
combustion
E.
decomposition
Question #22
Calculate the molar mass of magnesium chloride, MgCl2.
A.
70.0 g
B.
125.9 g
C.
95.3 g
D.
24.3 g
E.
59.8 g
Question #23
The following reaction is an example of a ________ reaction. C5H8 + 7O2 → 5CO2 + 4H2O
A.
double replacement
B.
combustion
C.
decomposition
D.
combination
E.
single replacement
Question #24
How many moles of water, H2O, are present in 75.0 g H2O?
A.
4.17 moles
B.
4.41 moles
C.
1.35 x 103 moles
D.
75.0 moles
E.
7.50 moles
Question #25
In the reaction of nitrogen gas, N2, with hydrogen gas, H2, to form ammonia gas, NH3, how many moles of hydrogen are needed to react with two moles of nitrogen? N2 + 3H2 → 2NH3
A.
4 moles
B.
5.710 moles
C.
6 moles
D.
2 moles
E.
8 moles
Question #26
Which of the following is an oxidation-reduction reaction?
A.
AgNO3 + NaCl → AgCl + NaNO3
B.
CaCl2 + Na2SO4 → CaSO4 + 2NaCl
C.
Al2(SO4) 3 + 6KOH → 2Al(OH)3 + 3K2SO4
D.
N2 + O2 → 2NO
E.
KOH + HNO3 → H2O + KNO3
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