Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

TopicSkillDifficulty

12 questions

SA-AC-EQ-0011 markL1 FoundationCalculatorKc expressions

For

\mathrm{N_2+3H_2\rightleftharpoons2NH_3}

K_c

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SA-AC-EQ-0121 markL1 FoundationCalculatorLe Chatelier

At dynamic equilibrium

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SA-AC-EQ-0021 markL2 StandardCalculatorKc expressions

The units of

K_c

for

\mathrm{N_2+3H_2\rightleftharpoons2NH_3}

are

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SA-AC-EQ-0031 markL2 StandardCalculatorLe Chatelier

For an exothermic forward reaction, increasing temperature

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SA-AC-EQ-0041 markL2 StandardCalculatorLe Chatelier

Adding a catalyst to an equilibrium mixture

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SA-AC-EQ-0052 marksL2 StandardCalculatorKc calculations

For

\mathrm{H_2+I_2\rightleftharpoons2HI}

at equilibrium:

[\mathrm{H_2}]=0.10

[\mathrm{I_2}]=0.10

[\mathrm{HI}]=0.70

mol dm⁻³. Calculate

K_c

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SA-AC-EQ-0071 markL2 StandardCalculatorLe Chatelier

For

\mathrm{2NO_2(g)\rightleftharpoons N_2O_4(g)}

, increasing pressure

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SA-AC-EQ-0081 markL2 StandardCalculatorKc expressions

A very large value of

K_c

means

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SA-AC-EQ-0101 markL2 StandardCalculatorLe Chatelier

In the Haber process, the yield of ammonia is increased by

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SA-AC-EQ-0064 marksL3 ExamCalculatorKc calculations

2.00

mol of

\mathrm{PCl_5}

is heated in a

2.00\ \text{dm}^3

vessel:

\mathrm{PCl_5\rightleftharpoons PCl_3+Cl_2}

. At equilibrium

0.800

mol of

\mathrm{Cl_2}

is present. Calculate

K_c

in mol dm⁻³.

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SA-AC-EQ-0093 marksL3 ExamCalculatorKc calculations

For

\mathrm{CH_3COOH+C_2H_5OH\rightleftharpoons CH_3COOC_2H_5+H_2O}

K_c=4.0

. Starting with 1.00 mol of each reactant, the equilibrium amount of ester is

x

mol, where

\frac{x^2}{(1-x)^2}=4.0

. Find

x

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SA-AC-EQ-0111 markL3 ExamCalculatorKc expressions

For

\mathrm{CaCO_3(s)\rightleftharpoons CaO(s)+CO_2(g)}

K_c

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