Bond Energies
- Created by: Jasmin
- Created on: 15-05-13 20:58
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- Bond Energies
- Exothermic reactions - energy change is negative
- Product at lower energy level than reactants
- When reactants form products, energy is released
- Surroundings get hotter
- Endothermic reactions - energy change is positive
- Products at higher energy level than reactants
- Difference in height represents energy taken in during reaction
- Surroundings get cooler
- Activation energy is lowered by catalysts
- Activation energy represents minimum energy needed by reacting particles to break their bonds
- Catalyst can increase rate of reaction
- Provide alternative pathway to products, which has lower activation energy
- Means higher proportion of reactant particles now have enough energy to react
- Provide alternative pathway to products, which has lower activation energy
- BOND ENERGY = energy needed to break the bond between 2 atoms
- ENDOTHERMIC - energy released when new bonds formed is less than energy absorbed when bonds broken
- EXOTHERMIC - energy released when new bonds formed is greater than energy absorbed when bonds are broken
- Exothermic reactions - energy change is negative
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