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2.3 revision_3

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  2.3 Revision Name…………………………………………………………………………………………………1. Dilute aqueous hydrogen peroxide, H 2 O 2 (aq), is used to sterilise contact lenses.Dilute H 2 O 2 (aq) slowly decomposes at room temperature to produce oxygen and water.The decomposition of H 2 O 2 (aq) can e made faster y! increasing the concentration of the H 2 O 2 (aq), adding a small amount of manganese( IV ) oxide catalyst, heating the solution to #$ %&. (i)&onstruct the equation for the decomposition of H 2 O 2 .......................................................................................................................... '  (ii)*xplain why increasing the concentration of H 2 O 2 (aq) increases the rate of decomposition..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... '2  (iii)*xplain how the catalyst can increase the rate of decomposition of H 2 O 2 (aq)....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... '2 Christ The King Sixth Form College1  2.3 Revision (i+)*xplain why increasing the temperature of H 2 O 2 (aq) increases the rate of decomposition. s part of your answer, you should add a second cur+e and any necessary laelsto the -oltmann distriution of molecular /inetic energies shown elow. numer of moleculeswith a gi+enenergy energy ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... '0'Total 1 mar/s  2. *thene and steam can e con+erted into ethanol.The equilirium is shown elow.& 2 H  (g) 3 H 2 O(g) & 2 H 4 OH(g)5 H   6 7 # /8 mol  7 le &hatelier9s principle can e used to predict the effect of changing conditions on the position of equilirium.(i):ame the catalyst used in this reaction.......................................................................................................................... ' Christ The King Sixth Form College2   2.3 Revision (ii);tate le &hatelier9s principle............................................................................................................................................................................................................................................................................................................................................................................ '  (iii)<sing le &hatelier9s principle, predict and explain the conditions that would gi+e the maximum equilirium yield of ethanol from ethene and steam..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... '0  (i+)The actual conditions used are #$ atmospheres pressure at 0$$ %& in the presence of a catalyst. &ompare these conditions with your answer to (iii) and comment on why these conditions are used....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... '0'Total 1 mar/s Christ The King Sixth Form College3  2.3 Revision 3.   student carried out an experiment to determine the enthalpy change of comustion of pentan==ol, &H 0 (&H 2 )  OH.>n the experiment, .?# g of pentan==ol was urnt. The energy was used to heat 24$ cm 0  of water from 2.$ %& to ?1.$ %&.(i)&alculate the energy released, in /8, during comustion of .?# g pentan==ol.The specific heat capacity of water 6 .1 8 g  7  @  7 .Density of water 6 .$$ g cm  70 .energy 6 .................................................... /8 '  (ii)&alculate the amount, in moles, of pentan==ol that was urnt.amount 6 .................................................. mol '2  (iii)&alculate the enthalpy change of comustion of pentan==ol.Ai+e your answer to three  significant figures. 5 H  c  6 ........................................... /8 mol  7 '0'Total # mar/s   Christ The King Sixth Form College4
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