CHEM 101 Final Exam Ivy Tech 2025/2026 |
Actual Ivy Tech Community College
Chemistry 101 Final Exam with Complete
Questions & Correct Detailed Answers |
Professor Verified
CHEM 101 – Original Practice Questions (2025/2026)
1. What is the atomic number of carbon?
Answer: 6
Explanation: The atomic number equals the number of protons in an atom. Carbon has 6
protons.
2. How many neutrons are in an isotope of carbon with mass number 14?
Answer: 8
Explanation: Neutrons = Mass number – Atomic number = 14 – 6 = 8.
3. Which element is a halogen?
A) Oxygen
B) Chlorine
C) Sodium
D) Neon
Answer: B) Chlorine
Explanation: Halogens are Group 17 elements, which include F, Cl, Br, I, At.
4. What is the electron configuration of oxygen (atomic number 8)?
,Answer: 1s² 2s² 2p⁴
Explanation: Oxygen has 8 electrons: 2 in 1s, 2 in 2s, 4 in 2p.
5. How many valence electrons does nitrogen have?
Answer: 5
Explanation: Nitrogen is in Group 15; valence electrons = group number = 5.
6. Which of the following is a covalent compound?
A) NaCl
B) H₂O
C) MgO
D) KBr
Answer: B) H₂O
Explanation: Covalent compounds involve sharing electrons between nonmetals. H₂O =
H + O (nonmetals).
7. What is the formula mass of CO₂?
Answer: 44 g/mol
Explanation: C = 12, O = 16 × 2 = 32 → 12 + 32 = 44 g/mol
8. Balance the reaction:
[__ H_2 + __ O_2 → __ H_2O]
Answer: 2 H₂ + 1 O₂ → 2 H₂O
Explanation: 4 H atoms on each side, 2 O atoms on each side.
9. What type of reaction is:
2 Na + Cl₂ → 2 NaCl
Answer: Synthesis (combination)
Explanation: Two elements combine to form a single compound.
, 10. Calculate the number of moles in 36 g of H₂O.
Answer: 2 moles
Explanation: Molar mass H₂O = 18 g/mol → 36 ÷ 18 = 2 moles
11. What is the empirical formula of C₆H₁₂O₆?
Answer: CH₂O
Explanation: Divide each subscript by the greatest common factor (6): C₆ ÷6 =1, H₁₂ ÷6
=2, O₆ ÷6 =1 → CH₂O
12. Which gas law relates pressure and volume at constant temperature?
Answer: Boyle’s Law
Explanation: (P_1V_1 = P_2V_2)
13. Standard temperature and pressure (STP) are:
Answer: 0°C (273 K) and 1 atm
Explanation: These are standard reference conditions for gases.
14. Which of the following is a strong acid?
A) HCl
B) HF
C) H₂CO₃
D) CH₃COOH
Answer: A) HCl
Explanation: Strong acids fully dissociate in water. HCl is strong; HF and others are
weak acids.
15. Calculate the molarity of a solution with 10 moles of solute in 2 liters of solution.
Actual Ivy Tech Community College
Chemistry 101 Final Exam with Complete
Questions & Correct Detailed Answers |
Professor Verified
CHEM 101 – Original Practice Questions (2025/2026)
1. What is the atomic number of carbon?
Answer: 6
Explanation: The atomic number equals the number of protons in an atom. Carbon has 6
protons.
2. How many neutrons are in an isotope of carbon with mass number 14?
Answer: 8
Explanation: Neutrons = Mass number – Atomic number = 14 – 6 = 8.
3. Which element is a halogen?
A) Oxygen
B) Chlorine
C) Sodium
D) Neon
Answer: B) Chlorine
Explanation: Halogens are Group 17 elements, which include F, Cl, Br, I, At.
4. What is the electron configuration of oxygen (atomic number 8)?
,Answer: 1s² 2s² 2p⁴
Explanation: Oxygen has 8 electrons: 2 in 1s, 2 in 2s, 4 in 2p.
5. How many valence electrons does nitrogen have?
Answer: 5
Explanation: Nitrogen is in Group 15; valence electrons = group number = 5.
6. Which of the following is a covalent compound?
A) NaCl
B) H₂O
C) MgO
D) KBr
Answer: B) H₂O
Explanation: Covalent compounds involve sharing electrons between nonmetals. H₂O =
H + O (nonmetals).
7. What is the formula mass of CO₂?
Answer: 44 g/mol
Explanation: C = 12, O = 16 × 2 = 32 → 12 + 32 = 44 g/mol
8. Balance the reaction:
[__ H_2 + __ O_2 → __ H_2O]
Answer: 2 H₂ + 1 O₂ → 2 H₂O
Explanation: 4 H atoms on each side, 2 O atoms on each side.
9. What type of reaction is:
2 Na + Cl₂ → 2 NaCl
Answer: Synthesis (combination)
Explanation: Two elements combine to form a single compound.
, 10. Calculate the number of moles in 36 g of H₂O.
Answer: 2 moles
Explanation: Molar mass H₂O = 18 g/mol → 36 ÷ 18 = 2 moles
11. What is the empirical formula of C₆H₁₂O₆?
Answer: CH₂O
Explanation: Divide each subscript by the greatest common factor (6): C₆ ÷6 =1, H₁₂ ÷6
=2, O₆ ÷6 =1 → CH₂O
12. Which gas law relates pressure and volume at constant temperature?
Answer: Boyle’s Law
Explanation: (P_1V_1 = P_2V_2)
13. Standard temperature and pressure (STP) are:
Answer: 0°C (273 K) and 1 atm
Explanation: These are standard reference conditions for gases.
14. Which of the following is a strong acid?
A) HCl
B) HF
C) H₂CO₃
D) CH₃COOH
Answer: A) HCl
Explanation: Strong acids fully dissociate in water. HCl is strong; HF and others are
weak acids.
15. Calculate the molarity of a solution with 10 moles of solute in 2 liters of solution.
