823728
Descrição
Mapa Mental por crinklechips1, atualizado more than 1 year ago
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Criado por crinklechips1
mais de 10 anos atrás
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Energy Changes
- Exothermic reactions
- Energy change is always
negative - Energy always
released to surroundings
- Eg. combustion
- Bond making
- More energy is released
making bonds than is
taken in breaking bonds
- Energy change is always
negative - Energy always
released to surroundings
- Endothermic reactions
- Energy change is always
positive - energy is taken
in from surroundings
- Eg. Creating
quicklime,
Baking a cake
- Bond breaking
- More energy is required
breaking bonds than is
released making bonds.
- Energy change is always
positive - energy is taken
in from surroundings
- Activation Energy
- Required to break the bonds in the reactants
- Minimum energy
particles need to react
- Required to break the bonds in the reactants
- Catalysts
- Speed up a reaction by
lowering the activation energy
- Speed up a reaction by
lowering the activation energy
- Q = mc ΔT
- Q = the heat energy
transferred (joule, J)
- m = the mass of the liquid
being heated (grams, g)
- c = the specific heat capacity
of the liquid (joule per gram
degree Celsius, J/g°C)
- ΔT = the change in temperature
of the liquid (degree Celsius, °C)
- ΔT = the change in temperature
of the liquid (degree Celsius, °C)
- c = the specific heat capacity
of the liquid (joule per gram
degree Celsius, J/g°C)
- m = the mass of the liquid
being heated (grams, g)
- Q = the heat energy
transferred (joule, J)
- Measuring Energy Transfer
- 1.Measure cold water into the CALORIMETER
2.Record the starting temperature of water
3.Heat water using flame from the burning fuel
4.Record final temp. of water
- To reduce heat loss - Increasing
accuracy: Use a lid, Insulate around
the beaker, stir, prevent draughts
- To reduce heat loss - Increasing
accuracy: Use a lid, Insulate around
the beaker, stir, prevent draughts
- 1.Measure cold water into the CALORIMETER
2.Record the starting temperature of water
3.Heat water using flame from the burning fuel
4.Record final temp. of water
- Fuel Effects: -Burning fuels releases
CO2, causing global warming which is
expensive to slow down and develop
alternatives -Crude oil is running out
and gets more expensive
- Energy released in Joules
- Energy Change per Mole: 1.Energy released
2.Find moles of substance (mass/mr)
3.Energy released/Mol
- Energy Change per Mole: 1.Energy released
2.Find moles of substance (mass/mr)
3.Energy released/Mol
Anexos de mídia
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