CHEM 121 FINAL
EXAM STUDY GUIDE QUESTIONS AND ANSWERS
TESTED AND APPROVED!!!
The following reaction: 2FeO 2Fe + O2, is an example of
a. combination.
b. single-displacement.
c. double-displacement.
d. decomposition. -- ANSWER--D
What is the molecular formula of a compound with the empirical formula
CH2Cl and molar mass of 98.96 g?
a. C3H6Cl3
b. C2H4Cl2
c. C4H8Cl4
d. CH2Cl -- ANSWER--B
One mole of glucose, C6H12O6, contains 24 atoms.
a. True
b. False -- ANSWER--B
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,The mole is 6.022 x 1023 particles.
a. True
b. False -- ANSWER--A
Given the unbalanced equation: C6H6 + O2 CO2 + H2O. When properly
balanced, the coefficient of oxygen is
a. 1.
b. 9.
c. 12.
d. 15. -- ANSWER--D
The following reaction: Mg + FeO MgO + Fe, is an example of
a. combination.
b. single-displacement.
c. double-displacement.
d. decomposition. -- ANSWER--B
The following reaction: LiOH + HCl LiCl + H2O, is an example of
a. single-displacement.
b. combination.
c. decomposition.
d. double-displacement. -- ANSWER--D
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,Which of the following is the formula for dinitrogen tetroxide?
A. N2O4
B. N4O2
C. N2O
D. NO2 -- ANSWER--A
HClO is named? A. chloric acid.
B. hypochlorous acid.
C. perchloric acid.
D. chlorous acid. -- ANSWER--B
How many molecules are present in 4.00 mol of Cl2?
a. 2.84 x 1025 molecules
b. 2.41 x 1024 molecules
c. 1.51 x 1023 molecules
d. 7.09 x 1024 molecules -- ANSWER--B
What is the molar mass of sodium chloride?
a. 67.53 g
b. 6.02 x 1023 g
c. 1.00 g
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, d. 58.44 g -- ANSWER--D
What is the mass of 0.724 moles of carbon tetrachloride (the molar mass of
CCl4 153.8 g) ?
a. 212 g
b. 111 g
c. 154 g
d. 312 g -- ANSWER--B
What is the percent by mass of oxygen in carbon dioxide?
a. 27.27%
b. 42.86%
c. 366.6%
d. 72.71% -- ANSWER--D
What is the empirical formula of a compound that consists of 39.99% carbon,
6.73% hydrogen, and
53.28% oxygen?
a. CH2O
b. C2HO
c. CHO
d. CHO2 -- ANSWER--A
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EXAM STUDY GUIDE QUESTIONS AND ANSWERS
TESTED AND APPROVED!!!
The following reaction: 2FeO 2Fe + O2, is an example of
a. combination.
b. single-displacement.
c. double-displacement.
d. decomposition. -- ANSWER--D
What is the molecular formula of a compound with the empirical formula
CH2Cl and molar mass of 98.96 g?
a. C3H6Cl3
b. C2H4Cl2
c. C4H8Cl4
d. CH2Cl -- ANSWER--B
One mole of glucose, C6H12O6, contains 24 atoms.
a. True
b. False -- ANSWER--B
Page 1 of 86
,The mole is 6.022 x 1023 particles.
a. True
b. False -- ANSWER--A
Given the unbalanced equation: C6H6 + O2 CO2 + H2O. When properly
balanced, the coefficient of oxygen is
a. 1.
b. 9.
c. 12.
d. 15. -- ANSWER--D
The following reaction: Mg + FeO MgO + Fe, is an example of
a. combination.
b. single-displacement.
c. double-displacement.
d. decomposition. -- ANSWER--B
The following reaction: LiOH + HCl LiCl + H2O, is an example of
a. single-displacement.
b. combination.
c. decomposition.
d. double-displacement. -- ANSWER--D
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,Which of the following is the formula for dinitrogen tetroxide?
A. N2O4
B. N4O2
C. N2O
D. NO2 -- ANSWER--A
HClO is named? A. chloric acid.
B. hypochlorous acid.
C. perchloric acid.
D. chlorous acid. -- ANSWER--B
How many molecules are present in 4.00 mol of Cl2?
a. 2.84 x 1025 molecules
b. 2.41 x 1024 molecules
c. 1.51 x 1023 molecules
d. 7.09 x 1024 molecules -- ANSWER--B
What is the molar mass of sodium chloride?
a. 67.53 g
b. 6.02 x 1023 g
c. 1.00 g
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, d. 58.44 g -- ANSWER--D
What is the mass of 0.724 moles of carbon tetrachloride (the molar mass of
CCl4 153.8 g) ?
a. 212 g
b. 111 g
c. 154 g
d. 312 g -- ANSWER--B
What is the percent by mass of oxygen in carbon dioxide?
a. 27.27%
b. 42.86%
c. 366.6%
d. 72.71% -- ANSWER--D
What is the empirical formula of a compound that consists of 39.99% carbon,
6.73% hydrogen, and
53.28% oxygen?
a. CH2O
b. C2HO
c. CHO
d. CHO2 -- ANSWER--A
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