CHEM 103 FINAL EXAM (VERSION-1, LATEST-2023)/ CHEM103 FINAL EXAM / CHEM 103 GENERAL
CHEMISTRY FINAL EXAM/ CHEM103 GENERAL CHEMISTRY FINAL EXAM: PORTAGE LEARNING QUESTIONS
AND ANSWERS ALREADY GRADED A+. 100% VERIFIED SOLUTIONS | UPDATED PER LATEST GUIDELINES |
GRADED A+...
Question 1
Which of the following represents a chemical change?
A. Melting of ice
B. Dissolving sugar in water
C. Burning of propane gas
D. Boiling of ethanol
🟢 Correct Answer:
C. Burning of propane gas
🔴 RATIONALE:
Burning propane involves a chemical reaction with oxygen to produce carbon dioxide and water, forming new
substances. Melting, dissolving, and boiling are physical changes because the chemical identity of the substance
remains unchanged.
Question 2
How many significant figures are in the measurement 0.00450 g?
A. 2
B. 3
C. 5
D. 6
,🟢 Correct Answer:
B. 3
🔴 RATIONALE:
Leading zeros are not significant. The digits 4, 5, and the trailing zero after the decimal point are significant,
giving three significant figures.
Question 3
Which subatomic particle has a positive charge?
A. Electron
B. Proton
C. Neutron
D. Positron only
🟢 Correct Answer:
B. Proton
🔴 RATIONALE:
Protons carry a positive charge, electrons carry a negative charge, and neutrons are neutral. A positron also
carries a positive charge but is not a standard subatomic particle found in atoms.
Question 4
What is the correct formula for aluminum sulfate?
A. AlSO₄
B. Al₂(SO₄)₃
C. Al₃(SO₄)₂
D. Al(SO₄)₃
,🟢 Correct Answer:
B. Al₂(SO₄)₃
🔴 RATIONALE:
Aluminum has a +3 charge, and sulfate has a −2 charge. To balance charges, two aluminum ions and three
sulfate ions are needed, giving Al₂(SO₄)₃.
Question 5
A sample of gas occupies 2.00 L at 1.00 atm. If the volume is increased to 4.00 L at constant temperature, what
is the new pressure?
A. 0.250 atm
B. 0.500 atm
C. 1.00 atm
D. 2.00 atm
🟢 Correct Answer:
B. 0.500 atm
🔴 RATIONALE:
According to Boyle's law, pressure and volume are inversely proportional at constant temperature. Doubling the
volume from 2.00 L to 4.00 L halves the pressure from 1.00 atm to 0.500 atm.
Question 6
Which of the following compounds is ionic?
A. CO₂
B. H₂O
, C. NaCl
D. CH₄
🟢 Correct Answer:
C. NaCl
🔴 RATIONALE:
Sodium chloride is composed of a metal and a nonmetal, forming an ionic bond through electron transfer. CO₂,
H₂O, and CH₄ are molecular compounds formed by covalent bonds between nonmetals.
Question 7
What is the molarity of a solution prepared by dissolving 0.500 mol of NaCl in enough water to make 2.00 L of
solution?
A. 0.250 M
B. 0.500 M
C. 1.00 M
D. 2.00 M
🟢 Correct Answer:
A. 0.250 M
🔴 RATIONALE:
Molarity is moles of solute divided by liters of solution: 0.500 mol ÷ 2.00 L = 0.250 M.
Question 8
Which element has the electron configuration 1s²2s²2p⁶3s²3p⁴?
A. Oxygen
CHEMISTRY FINAL EXAM/ CHEM103 GENERAL CHEMISTRY FINAL EXAM: PORTAGE LEARNING QUESTIONS
AND ANSWERS ALREADY GRADED A+. 100% VERIFIED SOLUTIONS | UPDATED PER LATEST GUIDELINES |
GRADED A+...
Question 1
Which of the following represents a chemical change?
A. Melting of ice
B. Dissolving sugar in water
C. Burning of propane gas
D. Boiling of ethanol
🟢 Correct Answer:
C. Burning of propane gas
🔴 RATIONALE:
Burning propane involves a chemical reaction with oxygen to produce carbon dioxide and water, forming new
substances. Melting, dissolving, and boiling are physical changes because the chemical identity of the substance
remains unchanged.
Question 2
How many significant figures are in the measurement 0.00450 g?
A. 2
B. 3
C. 5
D. 6
,🟢 Correct Answer:
B. 3
🔴 RATIONALE:
Leading zeros are not significant. The digits 4, 5, and the trailing zero after the decimal point are significant,
giving three significant figures.
Question 3
Which subatomic particle has a positive charge?
A. Electron
B. Proton
C. Neutron
D. Positron only
🟢 Correct Answer:
B. Proton
🔴 RATIONALE:
Protons carry a positive charge, electrons carry a negative charge, and neutrons are neutral. A positron also
carries a positive charge but is not a standard subatomic particle found in atoms.
Question 4
What is the correct formula for aluminum sulfate?
A. AlSO₄
B. Al₂(SO₄)₃
C. Al₃(SO₄)₂
D. Al(SO₄)₃
,🟢 Correct Answer:
B. Al₂(SO₄)₃
🔴 RATIONALE:
Aluminum has a +3 charge, and sulfate has a −2 charge. To balance charges, two aluminum ions and three
sulfate ions are needed, giving Al₂(SO₄)₃.
Question 5
A sample of gas occupies 2.00 L at 1.00 atm. If the volume is increased to 4.00 L at constant temperature, what
is the new pressure?
A. 0.250 atm
B. 0.500 atm
C. 1.00 atm
D. 2.00 atm
🟢 Correct Answer:
B. 0.500 atm
🔴 RATIONALE:
According to Boyle's law, pressure and volume are inversely proportional at constant temperature. Doubling the
volume from 2.00 L to 4.00 L halves the pressure from 1.00 atm to 0.500 atm.
Question 6
Which of the following compounds is ionic?
A. CO₂
B. H₂O
, C. NaCl
D. CH₄
🟢 Correct Answer:
C. NaCl
🔴 RATIONALE:
Sodium chloride is composed of a metal and a nonmetal, forming an ionic bond through electron transfer. CO₂,
H₂O, and CH₄ are molecular compounds formed by covalent bonds between nonmetals.
Question 7
What is the molarity of a solution prepared by dissolving 0.500 mol of NaCl in enough water to make 2.00 L of
solution?
A. 0.250 M
B. 0.500 M
C. 1.00 M
D. 2.00 M
🟢 Correct Answer:
A. 0.250 M
🔴 RATIONALE:
Molarity is moles of solute divided by liters of solution: 0.500 mol ÷ 2.00 L = 0.250 M.
Question 8
Which element has the electron configuration 1s²2s²2p⁶3s²3p⁴?
A. Oxygen
