ANSWERS AND MARK SCHEMES

Transcription

1 GSE EMISTRY PRODUTS FROM OIL ANSWERS AND MARK SEMES QUESTIONSEET (a) Any three from: bodies of sea creatures that died millions of years ago decayed anaerobically under high temperature and pressure 3 (b) (i) compounds with different numbers of carbon atoms have different boiling points heating vaporises crude oil different compounds condense at different temperatures 3 (ii) gasoline (iii) naphtha (c) compounds containing only the elements carbon & hydrogen QUESTIONSEET 2 TOTAL 0 (a) (i) distillation (ii) contains oil/stop oil running about/safety (b) very high dark yellow does not burn (c) (i) A Any two from low b.p./volatile easy to burn clean flame 2 (ii) high viscosity TOTAL 0

2 GSE EMISTRY PRODUTS FROM OIL ANSWERS AND MARK SEMES QUESTIONSEET 3 (a) a compound containing carbon & hydrogen only (b) Any two from: compounds have same general formula physical properties show gradation chemical properties are similar 2 (c) 6 4 (d) (i) (ii) straight chain version (iii) Any two from: has greatest contact with neighbouring molecules therefore greater intermolecular forces of attraction greater forces mean more energy/heat needed to separate molecules 2 QUESTIONSEET 4 2 TOTAL 0 (a) fractional distillation (b) cracking (c) polymerisation (d) n single bond indication of long chain (e) non-biodegradable/stays in ground for a long time toxic fumes when burnt TOTAL 7

3 GSE EMISTRY PRODUTS FROM OIL ANSWERS AND MARK SEMES QUESTIONSEET 5 (a) contains carbon carbon double bond (b) n 2n (c) Any two from: 300 o /raised temperature/heat 60 atmospheres/high pressure phosphoric acid/catalyst 2 (d) (e) shake each gas with bromine water bromine loses colour with ethene/not with ethane (f) O l l 2

4 GSE EMISTRY PRODUTS FROM OIL ANSWERS AND MARK SEMES QUESTIONSEET 6 (a) (i) high temperature named catalyst (aluminium oxide/silicon dioxide/broken pot) (ii) mineral wool soaked with liquid paraffin heat pieces of broken porcelain water liquid paraffin in mineral wool catalyst heat collection over water (iii) product is gas, starting material is liquid (b) saturated have only carbon-carbon single bonds unsaturated have at least one carbon-carbon double bond

5 GSE EMISTRY PRODUTS FROM OIL ANSWERS AND MARK SEMES QUESTIONSEET 7 (a) (i) (ii) has only carbon-carbon single bonds (b) (iii) needs a double bond to form polymers (i) (ii) (c) (i) cups/electrical fittings/kettles (ii) heat sample of the plastic if it melts it is thermoplastic if it chars it is thermosetting QUESTIONSEET or or (a) (i),2-dibromoethane (ii) hydrogen (iii) nickel/platinum (iv) phosphoric acid/sulphuric acid (v) poly(ethene) /polythene (vi) ethanol 3 (b) O 2 5 O 2 (c) making margarine

6 GSE EMISTRY PRODUTS FROM OIL ANSWERS AND MARK SEMES QUESTIONSEET 9 (a) (i) pentane (ii) 8 8 (b) (c) (i) sensible scales axes labelled + units points plotted correctly smooth curve drawn through points (ii) 99 o (+/- o ) 3 TOTAL 0

7 GSE EMISTRY PRODUTS FROM OIL ANSWERS AND MARK SEMES QUESTIONSEET 0 (a) 2 (b) (c) it is light/low density strong (d) poly(ethene) is stronger than paper can be mass produced/ethene is now readily available QUESTIONSEET 2 TOTAL 8 (a) (i) poly(phenylethene) (ii) 6 5 (b) double bond (c) (i) flexible electrical insulator (ii) rubber perishes/cracks in time poly(chloroethene) is fire-resistant (d) non-biodegradable toxic fumes when burned

8 GSE EMISTRY PRODUTS FROM OIL ANSWERS AND MARK SEMES QUESTIONSEET 2 (a) A poly(propene) B 3 n tetrafluoroethene D (b) the simplest compound from which a polymer is made (c) a molecule/compound made by joining thousands of monomers 2 (d) 2 F 4 (e) it does not rust/lighter/lower density QUESTIONSEET 3 (a) alkanes (b) ethene and propene 2 (c) (i) 8 8 (d) F F F F (ii) octane Two from: makes use of less useful fractions produces more petrol produces alkenes/raw materials for the petrochemical industry 2 (e) Two from: poly(ethene) ethanol bromoethane ethane-, 2-diol 2

9 GSE EMISTRY PRODUTS FROM OIL ANSWERS AND MARK SEMES QUESTIONSEET 4 (a) water (b) turn cloudy/milky (c) (i) carbon (ii) incomplete combustion (iii) carbon monoxide QUESTIONSEET 5 TOTAL 5 (a) O 2 5 O 2 (b) (i) oxygen (ii) (iii) 3 7 O O 3 For Two from: help to preserve food help food processing attractive colours 2 Against Two from: can have side effects lack of consumer choice can lead to bad food being sold 2 (c) (i) sugar cane needs warm climate to grow Brazil s climate is more suitable that Britain s (ii) people may drink it (d) solvent TOTAL 2

10 GSE EMISTRY PRODUTS FROM OIL ANSWERS AND MARK SEMES QUESTIONSEET 6 (a) (b) keep it cool keep away from flames & sparks (c) they would tend to boil off together QUESTIONSEET 7 TOTAL 7 (a) (i) 3% (± 2%) (ii) 6% (± 3%) (iii) 24% (± 3%) (b) liquid (c) % TOTAL 5

11 GSE EMISTRY PRODUTS FROM OIL ANSWERS AND MARK SEMES QUESTIONSEET 8 (a) (i) a substance which helps in cleaning processes (ii) Two from: if not, will stay in water causing rivers to foam harming aquatic life 2 (b) (i) chromatography (ii) ink would run in solvent (iii) yellow (iv) orange QUESTIONSEET 9 TOTAL 7 (a) guttering easily moulded carrier bags can be coloured or lightweight combs easily moulded sandwich bags non-toxic (b) (i) jet aeroplane fuel (ii) petrol (iii) petroleum gas QUESTIONSEET 20 TOTAL 7 (a) & D (both) (b) (i) produces carbon dioxide may produce toxic gases (ii) last for a long time/may cause pollution of water supplies eyesore (c) they may melt if they are thermoplastics (d) used to heat homes/factories TOTAL 8