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Topic Test 9.pdf - OCR Chemistry A 9 Enthalpy Topic test...

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9 EnthalpyTopic testOCR Chemistry A© Oxford University Press 2015This resource sheet may have been changed from the original1Student name:Date:Length: 40 minutesMark:/33Percentage:Feedback:WWW:EBI:
9 EnthalpyTopic testOCR Chemistry A© Oxford University Press 2015This resource sheet may have been changed from the original21. The following reaction represents an exothermic reaction:A+BC+DrH=638kJmol1The activation energy for this reaction is+345kJmol1.aiDefine the termactivation energy.(1 mark)iiDraw an enthalpy profile diagram for this reaction on the axes below andlabel the activation energy,Ea, and the enthalpy change of reaction, ∆rH.(2 marks)bThe reaction below is an exothermic reaction called the thermite reaction:Fe2O3+2AlAl2O3+2FeWhen iron(III) oxide reacts with aluminium, the heat generated will melt the iron produced. Aburning splint cannot initiate the reaction, so instead a fuse made of magnesium is inserted intothe reactant mixture. This fuse is ignited to initiate the reaction.Suggest why a burning splint cannot start the reaction.(1 mark)cThe thermite reaction is exothermic.

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Term
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Tags
Thermodynamics, Enthalpy, Standard enthalpy change of formation, Exothermic reaction

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