GCSE Chemistry: Hybrid Topics 0.0 / 5 ? ChemistryEnergy of reactions/Exothermic and endothermic reactionsGCSEAQA Created by: oreossssssssssssCreated on: 27-10-18 20:01 Exothermic A reaction which transfers energy to the surroundings, usually by heating. This is shown by a rise in temperature. 1 of 15 Endothermic A reaction which takes in energy from the surroundings. This is shown as a fall in temperature. 2 of 15 Activation Energy The initial rise in temperature needed to start the reaction (Ea) 3 of 15 Collision Theory The collision frequency of reacting particles & the energy transferred during a collision. 4 of 15 Rate How fast/slow the reactants are changing into products. 5 of 15 Surface Area The measure of how much exposed area a solid object has. 6 of 15 Energy Profile Diagrams that show the relative energies of the reactants and products in a reaction and how the energy changes over the course of a reaction. 7 of 15 Reactants These are the substances you react together. 8 of 15 Products These are the substances you make (end up with). 9 of 15 Bonds A link between atoms in molecules of compounds between ions, molecules & crystals. 10 of 15 What affects the rate of reactions? Temperature, concentration of a solution/pressure of a gas, surface area & presence of a catalyst. 11 of 15 Overall Energy Change Energy required to break bonds - Energy released by forming bonds. 12 of 15 Rate of Reaction Amount of reactant used of Amount of product formed / Time 13 of 15 Mean Reaction Rate Overall change in y value / total time taken 14 of 15 Gradient Change in y / Change in x 15 of 15
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