changes of states heating curves pure vs impure stearic acid melting experiment (melt the stearic acid in hot water, recording the temperature at different time intervals. Then plot a graph of the results.) variables

Energy is conserved in chemical reactions. The amount of energy in the universe at the end of a chemical reaction is the same as before the reaction takes place. If a reaction transfers energy to the surroundings the product molecules must have less energy than the reactants, by the amount transferred. An exothermic reaction is one that transfers energy to the surroundings so the temperature of the surroundings increases. Exothermic reactions include combustion, many oxidation reactions and neutralisation. Everyday uses of exothermic reactions include self-heating cans and hand warmers. An endothermic reaction is one that takes in energy from the surroundings so the temperature of the surroundings decreases. Endothermic reactions include thermal decompositions and the reaction of citric acid and sodium hydrogencarbonate. Some sports injury packs are based on endothermic reactions. Students should be able to: • distinguish between exothermic and endothermic reactions on the basis of the temperature change of the surroundings • evaluate uses and applications of exothermic and endothermic reactions given appropriate information.

starter on concentration of solutions various questions on paper 1 with answers as animations on ppt

Ions revision Physical Properties of Ionic Compounds exam questions OILRIG equations

Bonding recap questions/ answers molymods practical intramolecular forces relative formula questions

starter questions exam questions for AQA

universal indicator practical evaluating methods of detecting pH demo acids + alkalis and then use pH indicator neutralisation practical (you will need 3-4 different types of indigestion tablets) acid + alkali word equations