AQA Chemistry Paper 2

Transcription

1 AQA hemistry Pper A student is plnning n investigtion into how the concentrtion of hydrochloric cid ffects the rte of the rection with mrle chips. Wht is the independent vrile? Tick one ox. (1 mrk) Temperture oncentrtion of hydrochloric cid Size of mrle chips Volume of cron dioxide 1.2 The student predicted tht the rte of rection would decrese s the concentrtion of hydrochloric cid ws incresed. Give two resons the student s prediction is not correct. Tick two oxes. (2 mrks) There re more prticles to rect The prticles hve more energy The prticles move fster The rte of collisions increses The student set up the equipment s shown elow. Mesuring cylinder Bules of cron dioxide ydrochloric cid Wter 20 g mrle chips 1.3 Explin how the student will record the rte of the rection. (2 mrks) 1 of 10

2 AQA hemistry Pper The student recorded the results s shown in tle 1. Tle 1 Time (s) Volume of gs (dm 3 ) 0.5 mol/dm 3 l 1 mol/dm 3 l On piece of grph pper: Drw nd lel your xis Plot oth sets of dt in the tle Drw lines of est fit for oth sets of dt. (4 mrks) 1.5 Use your grph to determine the volume of gs produced t 50 seconds for oth tests. (2 mrks) 0.5 mol/dm 3 l 1 mol/dm 3 l 1.6 Explin wht effect incresing the temperture would hve on the rte of the rection. (3 mrks) 1.7 The student ws creful to mke sure tht the mrle chips used in oth tests were the sme size. Explin why this is importnt. (2 mrks) 1.8 Use your grph to compre the rte of rection s the rection progresses when the students uses 20 dm 3 of 0.5 mol/dm 3 nd 1 mol/dm 3 hydrochloric cid with 20 g of mrle chips. Explin your nswer in terms of prticles. (4 mrks) 2 of 10

3 AQA hemistry Pper Identify the lkne. Tick one ox. (1 mrk) 2.2 Identify the lkene. Tick one ox. (1 mrk) The structurl formule of two sturted hydrocrons re shown elow. ompound A ompound B Identify compounds A nd B. (1 mrk) ompound A ompound B Descrie two wys in which they will differ in their physicl properties. (2 mrks) i 2.4 ompound Y is mde y process clled X. The rection tht occurs during process X is shown y the eqution: Yest 6 12 O O + 2O 2 glucose Y + cron dioxide Nme compound Y (1 mrk) Nme process X (1 mrk) 2.5 Ethnol is memer of the homologous series of lcohols. Identify the correct generl formul for lcohols. Tick one ox. (1 mrk) n 2n O 2n 2n+1 O n 2n+2 O n 2n+1 O 3 of 10

4 O AQA hemistry Pper 2 Wht is the formul of the functionl group for lcohols? (1 mrk) c Ethnol is used s fuel ecuse ethnol urns in oxygen. omplete nd lnce the chemicl eqution for this rection. (2 mrks) 2 5 O + O 2 2O 2 + d Ethnol cn e oxidised to produce the compound shown. O i Wht is the nme of this compound? (1 mrk) When the compound shown dissolves in wter, descrie wht would hppen to the p. (1 mrk) e Ethnol rects with this compound to produce the orgnic compound lelled in the eqution elow. ompound 2 5 O + 3 OO 3 OO O Wht type of orgnic compound is ompound? (1 mrk) 2.6 eptne ( 7 16 ), is one of the hydrocrons from crude oil used for the mnufcture of poly(ethene). The first stge of the process is the production of ethene nd nother hydrocron from heptne heptne ethene In the ox ove, drw the structurl formul of the other hydrocron produced. (2 mrks) Stte two differences etween the two products. (2 mrks) 4 of 10

5 AQA hemistry Pper 2 c i Nme the process when ethene is produced from heptne. (1 mrk) Descrie how this rection is crried out. (2 mrks) d i Descrie how the polymer poly(ethene) is produced from the monomer ethene. (2 mrks) Drw the eqution for this rection using displyed formule. (2 mrks) e Descrie wht is ment y the term condenstion polymeristion. Include in your nswer how condenstion polymers differ from those produced y the method you descried in prt (d (i)). (2 mrks) 3.1 Identify two sustnces tht cn e descried s pure sustnces. Tick two oxes. (2 mrks) Milk Wter Steel Air Iron 5 of 10

6 AQA hemistry Pper Wht is the test for cron dioxide? Tick one ox. (1 mrk) Turns limewter cloudy Turns litmus pper white A glowing splint relights A light splint pops 3.3 A student ws given 5 unidentified metl ions to identify y crrying out flme tests. The student crried out series of tests to identify the metl ions, s shown in the tle. omplete the tle. (2 mrks) Metl ion opper lcium Flme colour Green-lue Red Ornge Potssium Suggest two lterntive methods the student could use to identify mixture of metl ions. (2 mrks) 3.4 A student tested n unknown compound Z. The student dded wter to compound Z. The compound did not chnge the colour of lue, roring flme. The student then dded solution of sodium hydroxide to compound Z. A white precipitte formed tht dissolved when excess sodium hydroxide ws dded. The student then dded solution of hydrochloric cid to compound Z. The mixture produced ules tht turned limewter cloudy. Identify sustnce Z. Explin your nswer. (4 mrks) 6 of 10

7 AQA hemistry Pper Billions of yers go, the Erth s erly tmosphere ws proly like the tmosphere of Venus tody. The tle elow shows the temperture nd the percentge composition of the tmospheres of the Erth nd Venus tody. Nme of gs Percentge (%) composition of tmosphere Erth tody Venus tody Nitrogen Oxygen 20.5 trce Argon 0.98 trce ron dioxide Wter vpour 0.4 trce Averge surfce temperture Use informtion from the tle to help you to nswer ech question. i In the Erth s tmosphere tody, the min gs is (1 mrk) In the Erth s tmosphere illions of yers go the min gs ws (1 mrk) The Erth s surfce is minly covered with wter. There is no wter on the surfce of Venus. Suggest why. (3 mrks) 4.2 Some scientists suggest tht excess cron dioxide should e prevented from entering the tmosphere. Explin why. (2 mrks) Explin wht is ment y the term greenhouse effect. (3 mrks) 7 of 10

8 AQA hemistry Pper 2 c When fossil fuels re urned to relese energy, some products re relesed into the tmosphere. i Suggest two possile products, in ddition to cron dioxide, tht my cuse environmentl or helth prolems. (2 mrks) Suggest n environmentl or helth prolem tht my e cused y one of these products. (1 mrk) 5.1 In the UK, we use out 1.8 illion steel cns every yer ut only 25% re recycled. Used steel cns re worth out 100 per tonne. Steel contins mostly iron. Recycling sves rw mterils nd reduces wste tht would end up in lndfill. Producing steel y recycling used cns sves 75% of the energy tht would e needed to produce steel from iron ore. This lso reduces cron dioxide emissions. Explin, in terms of toms, why steel is stronger thn iron. (3 mrks) Using the informtion given nd your own knowledge nd understnding of the extrction of iron from its ore, explin why the industry nd consumers re encourged to recycle used steel cns. (6 mrks) 8 of 10

9 AQA hemistry Pper ssiterite is n ore of the metl tin. Wht is n ore? (2 mrks) Some metls re otined y removing oxygen from the metl oxide. Wht nme do we give to this chemicl rection? (1 mrk) c Nme one metl which must e extrcted from its melted ore y electrolysis rther thn y using cron. (1 mrk) 5.3 In the United Kingdom, wter is filtered nd treted with chlorine to mke it sfe to drink. Explin why the wter is: Filtered (1 mrk) Treted with chlorine. (1 mrk) 5.4 A student wnted to test the purity of smple of wter. Descrie how the student could test tht the wter is pure. (2 mrk) 9 of 10

10 AQA hemistry Pper Ammoni is used in the production of fertilisers. This flow digrm shows the min stges in the mnufcture of mmoni. Nitrogen (from ir) ompressor (gses t 200 tmospheres) ydrogen (from methne) Study the flow digrm nd then nswer the questions elow. Rector contins iron (temperture of 450º) Nitrogen gs nd hydrogen gs Seprtor Ammoni liquid Wht is the purpose of the iron in the rector? (1 mrk) In the rector the eqution to produce mmoni is: N 2 (g) (g) exothermic endothermic 2N 3 (g) i The eqution shows tht the rection is reversile. Explin how the rection reches n equilirium. (1 mrk) The est yield of mmoni t equilirium is produced t low temperture. Explin why. (2 mrks) i The est yield of mmoni t equilirium is produced t high pressure. Explin why. (2 mrks) 10 of 10