AP Chemistry – Mock Test 4(Final Evaluation)
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Time: 35 minutes
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No checking answers until finished
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Show full reasoning (especially FRQ)
SECTION 1: MCQ
Question 1
For a reaction, Q = 2 and K = 0.5. What happens?
A. shift right
B. shift left
C. no change
D. stop
... Correct Answer: B Why: Q > K → too much product → shift left
Question 2
For an endothermic reaction, increasing temperature:
A. decreases K
B. increases K
C. no change
D. shifts left
... Correct Answer: B Why: Heat is reactant → more product → K increases
Question 3
If pressure increases, equilibrium shifts toward:
A. more moles gas
B. fewer moles gas
C. solids
D. liquids
... Correct Answer: B
Question 4
Removing reactant causes:
A. shift right
B. shift left
C. no change
D. stop
... Correct Answer: B
Question 5
Which change affects K?
A. pressure
B. concentration
C. catalyst
D. temperature
Correct Answer:
... Correct Answer: D
Question 6
At equilibrium:
A. reaction stops
B. forward = reverse
C. equal amounts
D. no motion
... Correct Answer: B
Question 7
If volume decreases:
A. pressure decreases
B. pressure increases
C. no change
D. becomes zero
... Correct Answer: B
Question 8
For exothermic reaction, increasing temperature shifts:
A. right
B. left
C. no change
D. increases K
... Correct Answer: B
Question 9
Which is correct K expression?
A. reactants/products
B. products/reactants
C. sum
D. difference
... Correct Answer: B
Question 10
Which is NOT included in K?
A. gas
B. aqueous
C. solid
D. ions
... Correct Answer: C
Question 11
pH of 1×10⁻³ M HCl:
A. 1
B. 2
C. 3
D. 4
... Correct Answer: C
Question 12
Which is strongest acid?
A. CH₃COOH
B. HF
C. HCl
D. NH₃
... Correct Answer: C
Question 13
Diluting a base:
A. increases pH
B. decreases pH
C. no change
D. neutralizes
... Correct Answer: B
Question 14
Which has hydrogen bonding?
A. CH₄
B. CO₂
C. NH₃
D. O₂
... Correct Answer: C
Question 15
Which is nonpolar?
A. H₂O
B. NH₃
C. CO₂
D. SO₂
... Correct Answer: C
Question 16
Which increases rate?
A. lower temp
B. catalyst
C. decrease concentration
D. remove reactant
... Correct Answer: B
Question 17
Oxidation means:
A. gain electrons
B. lose electrons
C. gain protons
D. lose protons
... Correct Answer: B
Question 18
Which is most basic?
A. pH 3
B. pH 5
C. pH 7
D. pH 12
... Correct Answer: D
Question 19
Which IMF is strongest?
A. dispersion
B. dipole
C. hydrogen bonding
D. ion-dipole
... Correct Answer: D
Question 20
Which is spontaneous?
A. ΔG > 0
B. ΔG = 0
C. ΔG < 0
D. ΔH > 0
... Correct Answer: C
SECTION 2: FRQ(FINAL LEVEL)
FRQ 1 (Equilibrium – MUST MASTER)
Explain how increasing pressure affects equilibrium in a gas reaction.
... Perfect Answer: Increasing pressure shifts the equilibrium toward the side with fewer moles of gas to reduce the pressure, according to Le Châtelier’s principle.
FRQ 2 (Temperature + K)
Explain how temperature affects K for exothermic reactions.
... Perfect Answer: In an exothermic reaction, heat is a product. Increasing temperature adds heat, shifting equilibrium to the left and decreasing the equilibrium constant K.
FRQ 3 (Acid–Base)
Explain why dilution increases pH.
... Perfect Answer: Dilution decreases the concentration of hydrogen ions (H⁺), which increases the pH because pH is inversely related to hydrogen ion concentration.