Chemistry2010 MarkScheme Januaryseries Q Part Subart Marking Guidance Mark Comments 4 a AntacidRoneutral iseacidityRasesindigestion 1 Creditsuitablereferencetondigestionortolaxativeortorel ieff constipation 4 b M1 Decrease in T decreases the energy of the particles/ ions/H+/molecules2 (also scores ...