Chemical Equilibrium (Grade 12 NSC Matric Physical Sciences): Quizzes

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The Equilibrium Constant
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What does the equilibrium constant (KcK_c) represent?

Ratio of product to reactant concentrations

What is meant by dynamic equilibrium?

Rates equal, concentrations constant

In a KcK_c expression, where are products placed?

On top of the fraction

What happens to coefficients from the balanced equation in a KcK_c expression?

They become powers

Which states are included in KcK_c expressions?

Only gases and aqueous solutions

For 2NO(g)+2H2(g)⇌N2(g)+2H2O(g)2NO(g) + 2H_2(g) ⇌ N_2(g) + 2H_2O(g), what is KcK_c?

[N2][H2O]2[NO]2[H2]2\frac{[N_2][H_2O]^2}{[NO]^2[H_2]^2}

What does Kc>1K_c > 1 indicate about a reaction?

Equilibrium favours products

What does 0<Kc<10 < K_c < 1 indicate?

More reactants, low yield

What does RICE stand for in equilibrium calculations?

Reaction, Initial, Change, Equilibrium

What does Kc≫1K_c ≫ 1 (much greater than 1) mean?

Reaction goes almost to completion

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