1 Equilibrium constant Kc

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Oxford Textbook Pages : 294 - 297

CGP Revision Guide Pages : 126 - 129

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Show Specification Ref : 5.1.2a, 5.1.2b, 5.1.2c, 5.1.2d, 5.1.2e, 5.1.2h

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Question 1 / 2

June 2011 QP – Unit 4 AQA Chemistry A-level_question_3 do not write outside the box the following dynamic equilibrium was established at temperature t in a closed container p g q g r g h kj mol the value of kc for the reaction was mol dm when the equilibrium mixture contained mol of p and mol of r a give the meaning of the term dynamic equilibrium marks extra space b write an expression for kc for this reaction mark c the volume of the container was dm calculate the concentration in mol dm of q in the equilibrium mixture marks extra space wmp jun chem do not write outside the box d state the effect if any on the equilibrium amount of p of increasing the temperature all other factors are unchanged mark e state the effect if any on the equilibrium amount of p of using a container of larger volume all other factors are unchanged mark f state the effect if any on the value of kc of increasing the temperature all other factors are unchanged mark g state the effect if any on the value of kc of using a container of larger volume all other factors are unchanged mark h deduce the value of the equilibrium constant at temperature t for the reaction r g p g q g mark turn over for the next question turn over wmp jun chem
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Question 2 / 2

June 2013 QP – Unit 4 AQA Chemistry A-level_question_2 do not write outside the box when heated above c nitrosyl chloride nocl partly decomposes to form nitrogen monoxide and chlorine as shown in the equation nocl g no g cl g a a mol sample of nocl was heated in a sealed container and equilibrium was established at a given temperature the equilibrium mixture formed contained mol of no calculate the amount in moles of cl and of nocl in this equilibrium mixture moles of cl moles of nocl marks b a different mixture of nocl no and cl reached equilibrium in a sealed container of volume dm the equilibrium mixture formed contained mol of nocl and mol of no at temperature t the value of kc for the equilibrium at temperature t was mol dm b i write an expression for the equilibrium constant kc mark b ii calculate the amount in moles of cl in this equilibrium mixture marks extra space wmp jun chem do not write outside the box b iii consider this alternative equation for the equilibrium at temperature t nocl g no g cl g calculate a value for the different equilibrium constant kc for the equilibrium as shown in this alternative equation deduce the units of this kc calculation units marks turn over for the next question turn over wmp jun chem
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