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2015 Presence of starch in a plant by photosynthesis To prepare a sample of oxygen gas To prepare a sample of carbon dioxide gas Titration Show that carbon dioxide is present in air Dispersion of white light Heating effect of electricity Test for protein Transpiration in a plant Germination Presence of hydrogen when sodium reacts with water Distillation Magnetic energy Density of an irregular solid Phototropism Filtration Rusting Show that carbon dioxide is more dense than air √ √ √ √ √ √ √ 2014 2013 2012 2011 √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ Magnetic field / Like poles, unlike poles Enzymes Chromatography Show the presence of water vapour in air Reaction of an alkali metal with water How to measure the pH of something Water hardness Conduction of heat √ √ √ √ √ √ √ √ √ √