QCE Chemistry Practice Questions - QCE Chemistry (Units 3 & 4) External Examination Exam - QCE Chemistry Practice Questions - QCE Chemistry (Units 3 & 4) External Examination Exam

Question 1

Which statement best describes a system at dynamic chemical equilibrium?

The forward and reverse reactions have both stopped The forward and reverse reactions occur at equal rates The concentrations of reactants and products are always equal Only the forward reaction is still occurring

Correct Answer:

The forward and reverse reactions occur at equal rates

Question 2

For the equilibrium N2(g) + 3H2(g) ⇌ 2NH3(g), which is the correct expression for Kc?

[N2][H2]³ / [NH3]² [NH3]² / ([N2][H2]³) [NH3] / ([N2][H2]) 2[NH3] / ([N2] + 3[H2])

Correct Answer:

[NH3]² / ([N2][H2]³)

Question 3

A large value of Kc (Kc ≫ 1) for a reaction at a given temperature indicates that at equilibrium:

Reactants are favoured Products are favoured The reaction has not started The reaction is at the same point as the start

Correct Answer:

Products are favoured

Question 4

For the exothermic equilibrium 2SO2(g) + O2(g) ⇌ 2SO3(g), what is the effect of increasing the temperature?

The equilibrium shifts towards SO3 and Kc increases The equilibrium shifts towards reactants and Kc decreases The equilibrium shifts towards reactants but Kc is unchanged The equilibrium position and Kc are both unchanged

Correct Answer:

The equilibrium shifts towards reactants and Kc decreases

Question 5

For the equilibrium N2O4(g) ⇌ 2NO2(g), what happens when the volume of the container is decreased at constant temperature?

The equilibrium shifts towards NO2 The equilibrium shifts towards N2O4 There is no shift because moles of gas are equal Kc increases

Correct Answer:

The equilibrium shifts towards N2O4

Question 1

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Prepare with the QCE Chemistry Practice Questions - QCE Chemistry (Units 3 & 4) External Examination Exam practice quiz. This question bank includes 100 questions covering acid, equilibrium, reaction, solution, and cell. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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QCE Chemistry Practice Questions - QCE Chemistry (Units 3 & 4) External Examination Exam

This practice set contains 100 questions from the matching question bank and focuses on acid, equilibrium, reaction, solution, and cell. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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QCE Chemistry Practice Questions - QCE Chemistry (Units 3 & 4) External Examination Exam

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