AS Chemistry WJEC Unit 2 2.5 / 5 based on 2 ratings ? ChemistryASWJEC Created by: Viruben NandakumarCreated on: 01-06-13 10:49 flame test colour for magensium no colour 1 of 34 flame test colour for potassium lilac, purple 2 of 34 flame test colour for calcium brick-red 3 of 34 flame test colour for barium apple green 4 of 34 flame test colour for sodium golden yellow 5 of 34 flame test colour for strontium crimson 6 of 34 flame test colour for lithium red 7 of 34 VSPER Theory linear shape 2 bonding pairs 180° 8 of 34 VSPER Theory trigonal planar 3 bonding pairs 120° 9 of 34 VSPER Theory tetrahedral 4 bonding pairs 109.5° 10 of 34 VSPER Theory trigonal bipyramidal/ square planar 5 bonding pairs 120°/ 90° 11 of 34 VSPER Theory Octahedral 6 bonding pairs 90° 12 of 34 testing for halides add nitric acid to remove any ions that may interfere with the reaction then add aqueous silver nitrate 13 of 34 results for chloride test white precipitate 14 of 34 results for bromide test pale cream precipitate 15 of 34 results for iodide test yellow precipitate 16 of 34 test for carbon double bond add bromide solution it will decolourise from reddish brown to colourless 17 of 34 free radical reaction between chlorine and ethane to produce methane 〖Cl〗_2+ uv→2Cl∙ initiation HOMOLYTIC FISSION 18 of 34 Cl∙+〖CH〗_4→〖CH〗_3 Cl∙ +HCL CHAIN PROPAGATION 〖∙CH〗_3+〖Cl〗_2→〖CH〗_3 CL+ CL∙ CHAIN PROPAGATION 19 of 34 CH_3 Cl+Cl∙→HCL+ ∙CH_2 Cl FREE RADICAL SUBSTITUTION ∙CH_2 Cl+Cl_2→CH_2 Cl_2+Cl∙ FREE RADICAL SUBSTITUTION 20 of 34 termination step ∙〖CH〗_3+∙〖CH〗_3→C_2 H_6 21 of 34 production of ethanol stem and ethene over phosphoric acid 300°C, 60-70 atm. CH_2=CH_2+H_2 O→CH_3 〖CH〗_2 OH 22 of 34 Dehydration reaction CH_3 CH_2 OH(g)→ H_2 O(g) + CH_2=CH_2 (g) Sulphuric acid (in excess) or aluminium oxide at about 170°C 23 of 34 Catalytic hydrogenation C_2 H_4+H_2→C_2 H_6 catalysts: platinum, palladium(room temp) and nickel 300°C 24 of 34 Raney nickel A form of very fine nickel particles low temperature and pressure. 25 of 34 Formation of ethene by an elimination reaction CH_3-CH_2 Br + NaOH →CH_2=CH_2 + NaBr + H2O; 2000 atm 200°C and in trace of oxygen poly(ethene) 26 of 34 High density poly(ethene) Ziegler-Natta catalysts, contains titanium (III) chloride, titanium (IV) chloride, aluminium triethyl 50-75°C 27 of 34 The difference between the low density form and the high density form low density polymer tends to have side chains which keep the chains apart high density form has very few side chains 28 of 34 polymer uses uses above 100°C containers, water pipes, wire, cable insulation. 29 of 34 Poly(chloroethene) or PVC 40 and 80 °C.free radical process in which the initiator is an organic peroxide 30 of 34 Poly(chloroethene) or PVC properties a hard rigid solid but its properties are modified by the addition of other chemicals called plasticizers 31 of 34 Poly(chloroethene) or PVC uses cable insulation, pipes, fittings, packaging, flooring, artificial leather, moulded articles 32 of 34 Poly(phenylethene) or polystyrene volatile colourless liquid; 33 of 34 Polystyrene uses toys, housings of electrical goods such as computers and kitchen appliances. 34 of 34
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