Section 7. Equilibria for Chemistry, A Level - revisedeck

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7. Equilibria

A section of Chemistry, 9701

Listing 10 of 344 questions

The equilibrium constant, Kc, for the reaction shown...

9701_s16_qp_13

MCQ

2016

Paper 1, Variant 3

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Catalysts are an important feature of many industrial processes and biochemical reactions. Which row correctly describes the effect of a catalyst on a reversible chemical reaction?

9701_s16_qp_13

MCQ

2016

Paper 1, Variant 3

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A reaction involved in the Contact process is shown...

9701_s17_qp_12

MCQ

2017

Paper 1, Variant 2

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Which statements are correct when a reversible reaction is at equilibrium?

9701_s18_qp_11

MCQ

2018

Paper 1, Variant 1

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In a particular reversible reaction the yield of product is increased ● if the temperature is increased; ● if the pressure is decreased. Which equation could describe this reversible reaction?

9701_s18_qp_12

MCQ

2018

Paper 1, Variant 2

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The reaction between sulfur dioxide and oxygen is reversible. 2SO2+ O22SO3Kc = 280 mol–1 dm3 at 1000 K In an equilibrium mixture at 1000 K the sulfur trioxide concentration is 6.00 mol dm–3. The sulfur dioxide concentration is twice the oxygen concentration. What is the sulfur dioxide concentration?

9701_s19_qp_11

MCQ

2019

Paper 1, Variant 1

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Ethyl ethanoate undergoes the following reaction. CH3CO2C2H5 + H2O C2H5OH + CH3CO2H Kc = 0.27 Equal amounts of ethanoic acid and ethanol were mixed together and allowed to reach equilibrium. At equilibrium, the concentrations of both ethanoic acid and ethanol were 0.42 mol dm–3. What is the concentration of ethyl ethanoate at equilibrium?

9701_s19_qp_12

MCQ

2019

Paper 1, Variant 2

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Two reactions are shown...

9701_s20_qp_13

MCQ

2020

Paper 1, Variant 3

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Ethanol combines with ethanoic acid to form ethyl ethanoate according to the following reaction. C2H5OH(+ CH3CO2H(CH3CO2C2H5(+ H2O(∆H o = –6 kJ mol–1 9.2 g ethanol, 12 g ethanoic acid and 8.8 g ethyl ethanoate are mixed and allowed to stand at 298 K, until equilibrium is reached. (Mr: C2H5OH, 46; CH3CO2H, 60; CH3CO2C2H5, 88) The resulting equilibrium mixture is found to contain 4.8 g ethanoic acid. The experiment is repeated at 323 K. Which statements are correct?

9701_s21_qp_11

MCQ

2021

Paper 1, Variant 1

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3.60 moles of hydrogen gas and 2.00 moles of iodine vapour are placed in a reaction vessel which is then sealed and maintained at a constant temperature. The equation for the reaction is shown...

9701_s21_qp_12

MCQ

2021

Paper 1, Variant 2

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Questions Discovered

344