2017 Paper 4 QP with Data

Universal Indicator paper turns red / orange, indicating pH = 3 (match with chart provided) When yellow FA 2 is added to colourless FA 1, the solution turns brown. Vigorous effervescence of colourless, odourless gas. Gas relights a glowing splint. Gas is oxygen. After a few minutes, the reaction mixture turns yellow. 2017 A level H2 Chem Paper 4 QP

30.4 30.5 30.5 38.9 +8.4 30.4 30.4 30.4 38.8 +8.4

Time of transfer, t (time at which reaction mixture is quenched) 1 min 40 s 4 min 50 s 7 min 54 s 11 min 17 s 15 min 6 s Decimal time, td /min 1.7 4.8 7.9 11.3 15.1 Final burette reading / cm3 40.00 47.50 14.55 24.80 30.80 Initial burette reading / cm3 12.40 27.75 0.75 14.60 24.80 Volume of FA 3 added / cm3 27.60 19.75 13.80 10.20 6.00