STRAIGHTERLINE CHEMISTRY FINAL EXAM TEST WITH COMPLETE SOLUTIONS

STRAIGHTERLINE CHEMISTRY FINAL
EXAM
1. Which of the following is an example of a covalent compound?

a) Sodium chloride (NaCl)

b) Magnesium oxide (MgO)

c) Carbon dioxide (CO₂)

d) Calcium sulfate (CaSO₄)

Answer: c) Carbon dioxide (CO₂)

2. What is the molarity of a solution prepared by dissolving 5.00 moles of sodium
chloride in 2.00 liters of solution?

a) 2.50 M

b) 10.0 M

c) 0.500 M

d) 2.00 M

Answer: a) 2.50 M

3. What is the empirical formula of a compound that is 40% carbon, 6.67% hydrogen,
and 53.33% oxygen by mass?

a) CH₃O

b) CHO

c) C₂H₅O

d) C₃H₆O₃

Answer: d) C₃H₆O₃

4. Which of the following elements has the highest ionization energy?

a) Sodium (Na)

,b) Magnesium (Mg)

c) Aluminum (Al)

d) Neon (Ne)

Answer: d) Neon (Ne)

5. In the reaction
2
𝐻
2
+
𝑂
2
→
2
𝐻
2
𝑂
2H
2

+O
2

→2H
2

O, what is the limiting reactant if 4 moles of
𝐻
2
H
2

react with 2 moles of
𝑂
2
O
2

?

a)
𝐻
2
H

,2



b)
𝑂
2
O
2



c)
𝐻
2
𝑂
H
2

O

d) There is no limiting reactant.

Answer: b)
𝑂
2
O
2



6. What is the pH of a solution with a hydrogen ion concentration of
1
×
1
0
−
4
1×10
−4
M?

a) 4

b) 10

c) 7

, d) 1

Answer: a) 4

7. Which of the following substances is a strong acid?

a) Acetic acid (CH₃COOH)

b) Sulfuric acid (H₂SO₄)

c) Carbonic acid (H₂CO₃)

d) Hydrofluoric acid (HF)

Answer: b) Sulfuric acid (H₂SO₄)

8. How many moles of potassium chloride (KCl) are in 250 grams of KCl? (Molar mass
of KCl = 74.55 g/mol)

a) 3.35 moles

b) 2.77 moles

c) 1.00 mole

d) 6.70 moles

Answer: b) 3.35 moles

9. What is the heat capacity of a substance if it absorbs 1500 J of heat and its
temperature increases by 15°C?

a) 100 J/°C

b) 75 J/°C

c) 90 J/°C

d) 150 J/°C

Answer: b) 100 J/°C

10. What type of reaction is represented by the following equation:
2
𝑁
𝑎
𝐶