Enthalpy change
- Created by: Jasmin
- Created on: 22-01-14 08:26
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- Enthalpy change from Experiments
- Energy transferred in a reaction can be calculated from the temp change of the system (if in solution) or a measured mass of water (in calorimetry experiements)
- To find enthalpy of combustion of a flammable liquid, you burn it...
- As fuel burns, it heats the water. Can workout the heat absorbed by the water if you know the mass of water, temp change of water and teh SHC (4.18 Jg-1K-1) of water
- All heat given out by the fuel as it burns would be absorbed by the water
- As fuel burns, it heats the water. Can workout the heat absorbed by the water if you know the mass of water, temp change of water and teh SHC (4.18 Jg-1K-1) of water
- Calorimetry can also be used to calculate the enthalpy change for a reaction that happens in solutions, such as neutralisation or displacement
- Enthalpy change of neutralisation reaction, add a known vol of acid to an insulated container and measure the temp
- Add a known vol of alkali, record the temperature rise (stir the solution to make sure the solution is evenly heated)
- Can work out the heat needed to raise the temp of the solution formed
- Add a known vol of alkali, record the temperature rise (stir the solution to make sure the solution is evenly heated)
- Enthalpy change of neutralisation reaction, add a known vol of acid to an insulated container and measure the temp
- Vol in calculations as 1cm3 of water has a mass of 1g
- Formula
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