In this worksheet provides targeted practice on the following topics for Combined science Chemistry: 13 States of matter 14 Atoms, Elements, Compounds 15 Stoichiometry

Cambridge O-level / IGCSE Combined Science Topical Worksheets + Answer scheme - Biology, in pdf. format for download, covering Topics for Biology: 1 Cells 2 Enzymes 3 Plant nutrition and transport 4 Human nutrition 5 Human gas exchange 6 Respiration 7 Transport in humans 8 Drugs and their effects 9 Coordination and control 10 Development of organisms and continuity of life 11 Biotechnology and genetic modification 12 Relationships of organisms with one another and with the environment

This worksheet provides targeted practice on Stoichiometry and reacting mass calculations, helping students apply balanced chemical equations to determine the masses of reactants and products.