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Chemical Equilibrium /
Quiz 1

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NCAT - Practice Test - Chemistry - Chemical Equilibrium Quiz

Attempt 10 MCQs on NCAT - Practice Test - Chemistry - Chemical Equilibrium | Quiz 1

1. What is the definition of chemical equilibrium?

Rates of forward and reverse reactions are equal
Concentrations of reactants and products are equal
Reaction stops completely
Only forward reaction occurs

2. How are forward and reverse reactions defined?

Forward: reactants -> products; Reverse: products -> reactants
Forward: products -> reactants; Reverse: reactants -> products
Both forward and reverse are the same
Only forward occurs

3. What is the term for equilibrium where reactions continue but no net change occurs?

Dynamic equilibrium
Static equilibrium
Irreversible
Non-equilibrium

4. What is the expression for the equilibrium constant Kc?

Kc = [products]/[reactants]
Kc = [reactants]/[products]
Kc = [products] x [reactants]
Kc = [products] + [reactants]

5. What is the correct Kc expression for aA + bB <=> cC + dD?

[C]^c [D]^d / [A]^a [B]^b
[A]^a [B]^b / [C]^c [D]^d
[C][D] / [A][B]
[A][B] / [C][D]

6. What is the Kc expression for the Haber process?

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

7. What does a large Kc value indicate?

Favors products
Favors reactants
Reaction is slow
Reaction is fast

8. What is the relation between Kp and Kc?

Kp = Kc(RT)^(Δn)
Kp = Kc/(RT)^(Δn)
Kp = Kc
Kp = Kc(RT)

9. How does the reaction quotient Q predict direction?

Forward if Q < K
Forward if Q > K
Reverse if Q < K
No change if Q != K

10. At 425°C, Kc=54.3 for H2+I2<=>2HI. If all concentrations are 0.1 M, which direction?

Forward
Reverse
At equilibrium
Cannot determine

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Instructions: Select one answer per question. After submitting, you will see your score, correct answers, and explanations.

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