Reaction Rates and Equilibrium (OCR A-Level Chemistry A): Quizzes

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The Equilibrium Constant Kc – Part 1
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What does the equilibrium constant KcK_c provide?

A quantitative measure of equilibrium

What does a KcK_c value greater than 1 indicate?

Equilibrium lies towards products

What does a KcK_c value less than 1 indicate?

Equilibrium lies towards reactants

What does KcK_c = 1 indicate about equilibrium?

Roughly similar amounts of both present

In the KcK_c expression, where are product concentrations placed?

In the numerator (top)

For \ceN2(g)+3H2(g)⇌2NH3(g)\ce{N2(g) + 3H2(g) \rightleftharpoons 2NH3(g)}, what is the KcK_c expression?

[\ceNH3]2[\ceN2][\ceH2]3\frac{[\ce{NH3}]^2}{[\ce{N2}][\ce{H2}]^3}

How are balancing numbers used in the KcK_c expression?

As powers (indices) of concentrations

What do square brackets [ ] represent in a KcK_c expression?

Concentration of, in mol dm−3^{-3}

Which concentrations must be used when calculating KcK_c?

Equilibrium concentrations only

A KcK_c value of 54.2 for \ceH2+I2⇌2HI\ce{H2 + I2 \rightleftharpoons 2HI} indicates what?

Predominantly HI present at equilibrium

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