AQA Combined Science Chemistry Paper 2.pdf

01.1 potable 1 AO1.1 5.10.1.2 A 01.2 boil (water) (boils) at 100°C allow boils at 100◦C for 2 marks ignore heat do not accept filter do not accept incorrect test alternative approach freeze (water) (1) (freezes) at 0°C (1) if no other mark awarded, allow 1 mark for evaporate or distil water and no solid left 1 1 AO2 5.8.1.1 E 01.3 Level 2: The design/plan would lead to the production of a valid outcome. All key steps are identified and logically sequenced. 3–4 AO1.1 5.10.1.2 10.2.13 E Level 1: The design/plan would not necessarily lead to a valid outcome. Some steps are identified, but the plan may not be logically sequenced. 1–2 No relevant content 0 Indicative content • weigh container. • measure volume (100 cm3) of water into container. • evaporate / heat until dry. • weigh container and remaining solids. • determine mass of dissolved solids To access Level 2 there should be an indication of using a known volume of water, heating until dry and determining the mass of solid.