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Mock Test 4 (Final Evaluation)

  • Time: 35 minutes
  • No checking answers until finished
  • Show full reasoning (especially FRQ)

SECTION 1: MCQ

Question 1

For a reaction, Q = 2 and K = 0.5. What happens?

  1. shift right
  2. shift left
  3. no change
  4. stop
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Correct answer: B

Why: Q > K → too much product → shift left

Question 2

For an endothermic reaction, increasing temperature:

  1. decreases K
  2. increases K
  3. no change
  4. shifts left
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Correct answer: B

Why: Heat is reactant → more product → K increases

Question 3

If pressure increases, equilibrium shifts toward:

  1. more moles gas
  2. fewer moles gas
  3. solids
  4. liquids
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Correct answer: B

Question 4

Removing reactant causes:

  1. shift right
  2. shift left
  3. no change
  4. stop
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Correct answer: B

Question 5

Which change affects K?

  1. pressure
  2. concentration
  3. catalyst
  4. temperature
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Correct answer: D

Question 6

At equilibrium:

  1. reaction stops
  2. forward = reverse
  3. equal amounts
  4. no motion
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Correct answer: B

Question 7

If volume decreases:

  1. pressure decreases
  2. pressure increases
  3. no change
  4. becomes zero
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Correct answer: B

Question 8

For exothermic reaction, increasing temperature shifts:

  1. right
  2. left
  3. no change
  4. increases K
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Correct answer: B

Question 9

Which is correct K expression?

  1. reactants/products
  2. products/reactants
  3. sum
  4. difference
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Correct answer: B

Question 10

Which is NOT included in K?

  1. gas
  2. aqueous
  3. solid
  4. ions
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Correct answer: C

Question 11

pH of 1×10⁻³ M HCl:

  1. 1
  2. 2
  3. 3
  4. 4
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Correct answer: C

Question 12

Which is strongest acid?

  1. CH₃COOH
  2. HF
  3. HCl
  4. NH₃
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Correct answer: C

Question 13

Diluting a base:

  1. increases pH
  2. decreases pH
  3. no change
  4. neutralizes
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Correct answer: B

Question 14

Which has hydrogen bonding?

  1. CH₄
  2. CO₂
  3. NH₃
  4. O₂
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Correct answer: C

Question 15

Which is nonpolar?

  1. H₂O
  2. NH₃
  3. CO₂
  4. SO₂
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Correct answer: C

Question 16

Which increases rate?

  1. lower temp
  2. catalyst
  3. decrease concentration
  4. remove reactant
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Correct answer: B

Question 17

Oxidation means:

  1. gain electrons
  2. lose electrons
  3. gain protons
  4. lose protons
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Correct answer: B

Question 18

Which is most basic?

  1. pH 3
  2. pH 5
  3. pH 7
  4. pH 12
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Correct answer: D

Question 19

Which IMF is strongest?

  1. dispersion
  2. dipole
  3. hydrogen bonding
  4. ion-dipole
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Correct answer: D

Question 20

Which is spontaneous?

  1. ΔG > 0
  2. ΔG = 0
  3. ΔG < 0
  4. ΔH > 0
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Correct answer: C

SECTION 2: FRQ(FINAL LEVEL)

FRQ 1 (Equilibrium – MUST MASTER)

Explain how increasing pressure affects equilibrium in a gas reaction.

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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.

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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.

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Perfect Answer:
Dilution decreases the concentration of hydrogen ions (H⁺), which increases the pH because pH is inversely related to hydrogen ion concentration.