1
CHEM 1031 Fall 2026 Final Exam | Actual Questions and Answers Latest Updated (Graded
A+)
(Constants and the Periodic Table are on page 9. The answer key is on page 10.)
1. What is the chemical symbol for potassium?
A. Po B. K C. Pm D. P
3.9 + 7.2
2. How many significant figures should be recorded for the result of the calculation: ?
0.3128
A. 5 B. 4 C. 3 D. 2
3. What volume of alcohol will have the same mass as 49.3 cm3 of aluminum. (Density of alcohol = 0.860
g/cm3; density of aluminum = 2.70 g/cm3).
A. 15.7 cm3 B. 18.3 cm3 C. 21.3 cm3 D. 155. cm3
4. A burner delivers 80.0 kcal of energy per minute. How many kilojoules of energy will be delivered in
2.0 hours? (1 calorie = 4.184 J).
A. 40. kJ B. 11. kJ C. 2.3 x 103 kJ D. 4.0 x 104 kJ
5. Which represents a mixture of two elements?
6. What is inside the bubbles when liquid water has been left boiling for 1 hour?
A. air B. H2(g) and O2(g) C. H2O(g) D. O2(g)
7. Which is a physical change?
A. wood burning B. gold melting C. silver tarnishing D. grass dying
42
8. The symbol 20X represents an element with how many neutrons?
A. Ca with 22 neutrons B. Ca with 42 neutrons C. Mo with 22 neutrons D. Mo with 42 neutrons
, 2
9. Rutherford directed alpha particles at a thin piece of gold foil. He observed that only a few particles
were sharply deflected. How did he interpret this observation?
A. Electrons can only have specific quantized energies.
B. Atoms have isotopes with different masses and numbers of neutrons.
C. Electrons move in circular orbits within the atom.
D. All protons in an atom are concentrated in a relatively small volume.
10. What is the correct symbol for an ion of bismuth with 80 electrons and 124 neutrons?
124 3− 207 3+ 207 3− 124 3+
A. 83 Bi B. 83 Bi C. 83 Bi D. 83 Bi
11. Vanadium (V) has only two naturally occurring isotopes, vanadium-50 and vanadium-51. Which is a
valid conclusion that can be drawn about vanadium?
A. The abundance of each isotope is 50%.
B. Vanadium-51 is more abundant than vanadium-50.
C. All vanadium atoms have a mass of 50.94 amu.
D. Vanadium-50 is more abundant that vanadium-51.
12. How many moles of iron are in 35.6 g of Fe2O3?
A. 0.446 mol B. 4.49 mol C. 0.223 mol D. 8.97 mol
13. How many oxygen atoms are in a 5.24 g sample of (NH4)2Fe(SO4)2∙6H2O (molar mass = 392. g/mol).
A. 8.05 x 1021 B. 1.13 x 1023 C. 6.44 x 1022 D. 4.42 x 1025
14. What is the charge on the iron ions in (NH4)2Fe(SO4)2∙6H2O?
A. 4+ B. 3+ C. 2+ D. 1+
15. What is the mass percent of hydrogen in (NH4)2Fe(SO4)2∙6H2O?
A. 5.14% B. 4.11% C. 3.09% D. 2.06%
16. The mass of the average grape is 0.25 g and the mass of a bottle of wine is 1.3 kg. What is the number
of bottles of wine whose total mass is the same as 1.0 mol of grapes?
A. 1.2 x 1020 B. 3.1 x 1021 C. 1.2 x 1023 D. 2.0 x 1020
17. What is the formula of the compound formed between chromium(III) ions and carbonate ions?
A. CrCO3 B. Cr3(CO3)2 C. Cr2(CO3)3 D. Cr(CO3)3
18. What is the name of S2F4?
A. sulfur(IV) fluoride B. disulfur tetrafluoride
C. disulfur tetraflouride D. disulfur tetrafluorine
CHEM 1031 Fall 2026 Final Exam | Actual Questions and Answers Latest Updated (Graded
A+)
(Constants and the Periodic Table are on page 9. The answer key is on page 10.)
1. What is the chemical symbol for potassium?
A. Po B. K C. Pm D. P
3.9 + 7.2
2. How many significant figures should be recorded for the result of the calculation: ?
0.3128
A. 5 B. 4 C. 3 D. 2
3. What volume of alcohol will have the same mass as 49.3 cm3 of aluminum. (Density of alcohol = 0.860
g/cm3; density of aluminum = 2.70 g/cm3).
A. 15.7 cm3 B. 18.3 cm3 C. 21.3 cm3 D. 155. cm3
4. A burner delivers 80.0 kcal of energy per minute. How many kilojoules of energy will be delivered in
2.0 hours? (1 calorie = 4.184 J).
A. 40. kJ B. 11. kJ C. 2.3 x 103 kJ D. 4.0 x 104 kJ
5. Which represents a mixture of two elements?
6. What is inside the bubbles when liquid water has been left boiling for 1 hour?
A. air B. H2(g) and O2(g) C. H2O(g) D. O2(g)
7. Which is a physical change?
A. wood burning B. gold melting C. silver tarnishing D. grass dying
42
8. The symbol 20X represents an element with how many neutrons?
A. Ca with 22 neutrons B. Ca with 42 neutrons C. Mo with 22 neutrons D. Mo with 42 neutrons
, 2
9. Rutherford directed alpha particles at a thin piece of gold foil. He observed that only a few particles
were sharply deflected. How did he interpret this observation?
A. Electrons can only have specific quantized energies.
B. Atoms have isotopes with different masses and numbers of neutrons.
C. Electrons move in circular orbits within the atom.
D. All protons in an atom are concentrated in a relatively small volume.
10. What is the correct symbol for an ion of bismuth with 80 electrons and 124 neutrons?
124 3− 207 3+ 207 3− 124 3+
A. 83 Bi B. 83 Bi C. 83 Bi D. 83 Bi
11. Vanadium (V) has only two naturally occurring isotopes, vanadium-50 and vanadium-51. Which is a
valid conclusion that can be drawn about vanadium?
A. The abundance of each isotope is 50%.
B. Vanadium-51 is more abundant than vanadium-50.
C. All vanadium atoms have a mass of 50.94 amu.
D. Vanadium-50 is more abundant that vanadium-51.
12. How many moles of iron are in 35.6 g of Fe2O3?
A. 0.446 mol B. 4.49 mol C. 0.223 mol D. 8.97 mol
13. How many oxygen atoms are in a 5.24 g sample of (NH4)2Fe(SO4)2∙6H2O (molar mass = 392. g/mol).
A. 8.05 x 1021 B. 1.13 x 1023 C. 6.44 x 1022 D. 4.42 x 1025
14. What is the charge on the iron ions in (NH4)2Fe(SO4)2∙6H2O?
A. 4+ B. 3+ C. 2+ D. 1+
15. What is the mass percent of hydrogen in (NH4)2Fe(SO4)2∙6H2O?
A. 5.14% B. 4.11% C. 3.09% D. 2.06%
16. The mass of the average grape is 0.25 g and the mass of a bottle of wine is 1.3 kg. What is the number
of bottles of wine whose total mass is the same as 1.0 mol of grapes?
A. 1.2 x 1020 B. 3.1 x 1021 C. 1.2 x 1023 D. 2.0 x 1020
17. What is the formula of the compound formed between chromium(III) ions and carbonate ions?
A. CrCO3 B. Cr3(CO3)2 C. Cr2(CO3)3 D. Cr(CO3)3
18. What is the name of S2F4?
A. sulfur(IV) fluoride B. disulfur tetrafluoride
C. disulfur tetraflouride D. disulfur tetrafluorine
