(a) Gary wrote the labels on the paper in pancil Why should he not write them in ink? pancil are better because they don't smudge kan 1 TK (b) Look at Gary's results The different dyes in some of the food colourdoga had moved up the paper. ( Which food colouring contained the banndd food dye? 1 mark (W) Which food colouring contained the most dyes? 1 mark (c) Which food colouring did not dissolve in the water? 1 mark (d) Which method did Gary use to separate the dyes? Tick the correct box. chromatography distillation evaporation filtration 1 mark maxmum 5 marks
Molecular iodine, i2(g), dissociates into iodine atoms at 625 k with a first-order rate constant of 0.271 sā1. part a part complete what is the half-life for this reaction?