Uses of Equilibrium Constants (HSC SSCE Chemistry): Quizzes

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Uses of Equilibrium Constants
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What does an equilibrium constant Keq>103K_{eq} > 10^3 indicate?

Products strongly favoured at equilibrium

What does an equilibrium constant Keq<10−3K_{eq} < 10^{-3} indicate?

Reactants strongly favoured at equilibrium

What does KeqK_{eq} between 0.1 and 10 indicate?

Both reactants and products present

What is the reaction quotient QQ used for?

Calculated at any point during reaction

What does Q=KeqQ = K_{eq} indicate about a system?

The reaction has reached equilibrium

What happens when Q<KeqQ < K_{eq}?

Forward reaction favoured, shifts right

What happens when Q>KeqQ > K_{eq}?

Reverse reaction favoured, shifts left

What are two main applications of KeqK_{eq}?

Check equilibrium & calculate conc.

In COCl2⇌CO+Cl2COCl_2 \rightleftharpoons CO + Cl_2, why are [CO][CO] and [Cl2][Cl_2] equal at equilibrium from COCl2COCl_2?

They form in 1:1 stoichiometric ratio

For Haber process at 427°C, Keq=0.26K_{eq} = 0.26. If Q=1.2×10−3Q = 1.2 \times 10^{-3}, what occurs?

System shifts right to make more NH3NH_3

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Qualitative Equilibrium

Calculating the Equilibrium Constant

Solution Equilibria

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Qualitative Equilibrium

Calculating the Equilibrium Constant

Solution Equilibria

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Qualitative Equilibrium

Calculating the Equilibrium Constant

Solution Equilibria

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Qualitative Equilibrium

Calculating the Equilibrium Constant

Solution Equilibria

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