Energy
- Created by: Jasmin
- Created on: 09-05-13 19:13
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- Can be measured by:
- Energy
- EXOTHERMIC
- Gives out energy to surroundings, heat, rise in temp
- Example: fuel burning
- ENDOTHERMIC
- Takes in energy from surroundings, heat, fall in temp
- Example: photosynthesis
- During chemical reactions old bonds break, new formed
- Break bonds
- Energy mut be supplied to break existing bonds: Endothermic
- E required to break old bonds greater than energy released when new bonds formed
- Energy mut be supplied to break existing bonds: Endothermic
- Form bonds
- Energy released when new bonds formed
- Energy released to form bonds greater than energy used in breaking old bonds
- Energy released when new bonds formed
- Break bonds
- EXOTHERMIC
- Chemical reaction by taking temp of reagents (make sure same)
- Mix in polysytrene cup and measure temp of solution at end of reaction
- Method works for reactions of solids with water and neutralisation reactions
- Mix in polysytrene cup and measure temp of solution at end of reaction
- Biggest problme with energy measurements is
- Amount of energy lost surroundings - can be reduced by
- Putting beaker into cotton wool more insulation
- Put lid on cup to reduce energ lost by evaporation
- Amount of energy lost surroundings - can be reduced by
- Energy
- Energy
- EXOTHERMIC
- Gives out energy to surroundings, heat, rise in temp
- Example: fuel burning
- ENDOTHERMIC
- Takes in energy from surroundings, heat, fall in temp
- Example: photosynthesis
- During chemical reactions old bonds break, new formed
- Break bonds
- Energy mut be supplied to break existing bonds: Endothermic
- E required to break old bonds greater than energy released when new bonds formed
- Energy mut be supplied to break existing bonds: Endothermic
- Form bonds
- Energy released when new bonds formed
- Energy released to form bonds greater than energy used in breaking old bonds
- Energy released when new bonds formed
- Break bonds
- EXOTHERMIC
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