AP Chemistry – Mock Test 3(High-Yield Version)
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Time yourself: 35 minutes
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No checking answers until finished
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Focus on reasoning, not memorization
SECTION 1: MCQ
Question 1
Which has the smallest atomic radius?
A. Na
B. Mg
C. Al
D. Cl
... Correct Answer: D Why: Atomic radius decreases left → right. Fix It: Right = smaller
Question 2
Which has strongest Coulombic attraction?
A. Na⁺
B. Mg²⁺
C. Al³⁺
D. K⁺
... Correct Answer: C Why: Higher charge = stronger attraction. Fix It: More charge = stronger
Question 3
Which molecule is nonpolar?
A. H₂O
B. NH₃
C. CO₂
D. SO₂
... Correct Answer: C Why: Linear symmetry cancels dipoles. Fix It: Symmetry = nonpolar
Question 4
Which IMF is present in all molecules?
A. Hydrogen bonding
B. Dipole-dipole
C. Ion-dipole
D. London dispersion
... Correct Answer: D Why: All molecules have dispersion forces. Fix It: Always LDF
Question 5
Increasing temperature will:
A. decrease rate
B. increase rate
C. stop reaction
D. no change
... Correct Answer: B
Question 6
Which process releases heat?
A. melting
B. evaporation
C. condensation
D. sublimation
... Correct Answer: C
Question 7
For exothermic reaction, increasing temperature shifts:
A. right
B. left
C. no change
D. depends
... Correct Answer: B Why: Heat is product → adding heat shifts left
Question 8
If Q > K:
A. shift right
B. shift left
C. no change
D. stop
... Correct Answer: B
Question 9
Catalyst affects:
A. K
B. equilibrium position
C. rate
D. concentration
... Correct Answer: C
Question 10
pH of 1×10⁻² M acid:
A. 1
B. 2
C. 3
D. 4
... Correct Answer: B
Question 11
Which is conjugate acid of NH₃?
A. NH₂⁻
B. NH₄⁺
C. H⁺
D. OH⁻
... Correct Answer: B
Question 12
Which increases solubility?
A. decrease temperature
B. increase pressure (gas)
C. decrease pressure
D. no change
... Correct Answer: B
Question 13
Oxidation =
A. gain electrons
B. lose electrons
C. gain protons
D. lose protons
... Correct Answer: B
Question 14
Which is strongest oxidizing agent?
A. loses electrons easily
B. gains electrons easily
C. neutral
D. stable
... Correct Answer: B
Question 15
At equilibrium:
A. reaction stops
B. forward = reverse
C. equal amounts
D. no motion
... Correct Answer: B
Question 16
Which increases reaction rate?
A. lower temp
B. lower concentration
C. catalyst
D. remove reactant
... Correct Answer: C
Question 17
If pressure increases:
A. more gas side
B. fewer gas side
C. liquid side
D. no change
... Correct Answer: B
Question 18
Which has hydrogen bonding?
A. CH₄
B. CO₂
C. NH₃
D. O₂
... Correct Answer: C
Question 19
Dilution of acid:
A. lower pH
B. raise pH
C. no change
D. neutral
... Correct Answer: B
Question 20
Which reaction is spontaneous?
A. ΔG > 0
B. ΔG = 0
C. ΔG < 0
D. ΔH > 0
... Correct Answer: C
SECTION 2: FRQ
FRQ 1
Explain how Q and K determine direction of reaction.
... Key Points: - compare Q vs K - QK → backward Sample: System shifts to reach equilibrium by comparing Q to K.
FRQ 2
Explain how temperature affects equilibrium.
... Key Points: - exo vs endo - heat as reactant/product - shift direction Sample: System shifts to absorb added heat.