Endothermic and Exothermic Reactions 0.0 / 5 ? ChemistryEnergy of reactions/Exothermic and endothermic reactionsGCSEAQA Created by: JB71Created on: 25-03-23 11:54 Energy level decreases in this reaction ( so product energy level lower than reactants in 'reaction profile') Exothermic Reaction 1 of 15 Energy changes are shown as positive, as energy has been gained Endothermic reaction 2 of 15 Bonds are broken in reactants ( require energy to break the bonds) in this reaction Endothermic reaction 3 of 15 Bonds are formed to make products ( releasing energy) in this reaction Exothermic reaction 4 of 15 Energy changes are shown as negative, as energy transferred from the chemicals Exothermic reaction 5 of 15 Examples include : Combustion ( burning) Oxidation Exothermic reaction 6 of 15 Uses: instant ice packs frying eggs Endothermic reaction 7 of 15 Energy is taken in from the surroundings Endothermic reaction 8 of 15 Surrounding temperature decreases Endothermic reaction 9 of 15 Examples include: photosynthesis thermal decomposition sodium hydrogencarbonate and citric acid reaction Endothermic reaction 10 of 15 Energy level increases in this reaction ( so product energy is higher than the reactant energy in the 'reaction profile' Endothermic reaction 11 of 15 Energy of surrounding increases Exothermic reaction 12 of 15 Uses include: self heating cans hand warmers Exothermic reaction 13 of 15 Minimum amount of energy that colliding particles must have for a reaction to occur Activation energy 14 of 15 Energy given out the surroundings (as heat) Exothermic reaction 15 of 15
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