C3 4.2 Energy Changes in Reactions Multiple choice questions on energy changes in reactions. 5.0 / 5 based on 5 ratings ? ChemistryEnergy of reactions/Exothermic and endothermic reactionsGCSEAll boards Created by: RhiannonCreated on: 29-04-12 10:08 Energy is used to _____ chemical bonds. break 1 of 9 This energy is the ______ energy for the reaction. activation 2 of 9 When bonds are made energy is _______. released 3 of 9 If more energy is needed to ______ bonds than is released when new bonds form, the chemical reaction is ______. break/endothermic 4 of 9 If more energy is released when bonds are _____ in the products than is used in _____ the bonds in the reactants, the chemical reaction is ______. made/breaking/exothermic 5 of 9 Energy change is represented by the symbol ______. ΔH 6 of 9 The symbol above is negative for _______ reactions. exothermic 7 of 9 The symbol above is positive for _____ reactions. endothermic 8 of 9 Energy changes in reactions are measured in ______. KJ/mol 9 of 9
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