Chemistry: Year 10 Term 2: Bond Energy Calculations 0.0 / 5 ? ChemistryEnergy of reactions/Exothermic and endothermic reactionsGCSEAQA Created by: Charlotte HerondaleCreated on: 25-11-18 14:19 When more energy is released to make bonds than used to break them, what is the reaction? (1) Exothermic 1 of 9 When more energy is used to break bonds than released to make them, what is the reaction? (1) Endothermic 2 of 9 Define 'bond energy' (2) The energy needed to break the bond between two atoms 3 of 9 How is the energy change calculated? (3) (energy needed to break reactant bonds) - (energy needed to create product bonds) 4 of 9 A negative result means the reaction is what? (1) Exothermic 5 of 9 A positive result means the reaction is what? (1) Endothermic 6 of 9 General energy change equation = (2) SHC x Mass x Temperature Change 7 of 9 SHC is always equal to what? (1) 4.2 8 of 9 1cm3 = ?g (1) 1 9 of 9
Comments
No comments have yet been made