Chemistry ISA fuels section 1

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Created by: bookgirl2101
Created on: 10-11-16 15:06

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Chemistry ISA
- hypothesis
  - As the relative formula mass of a fuel increases, so does the energy change when it is burned.
  - The longer the chain of bonds, the more energy is given out per gram
    - As the relative formula mass of a fuel increases, so does the energy change when it is burned.
  - The reaction of burning alcohol is exothermic
  - When bonds are made, energy is given out to the surroundings, the temperature then goes up (exothermic)
- Sources
  - BBC source - bad, not useful, basic method
  - RSC source - good method, detailed, good
- Control variables
  - Volume of water (100cm3)
  - Distance from spirit burner to calorimeter (10cm)
- Context
  - Issues with some fuels are releasing too much or too little energy
Table
- headings - type of fuel, mass of spirit burner and fuel before, mass of spirit burner and fuel after, temperature before, temperature after, temperature change
- Chemistry ISA
  - hypothesis
    - The longer the chain of bonds, the more energy is given out per gram
    - The reaction of burning alcohol is exothermic
    - When bonds are made, energy is given out to the surroundings, the temperature then goes up (exothermic)
  - Sources
    - BBC source - bad, not useful, basic method
    - RSC source - good method, detailed, good
  - Control variables
    - Volume of water (100cm3)
    - Distance from spirit burner to calorimeter (10cm)
  - Context
    - Issues with some fuels are releasing too much or too little energy
Fuels
- Methanol, ethanol, propanol, butanol, pentanol
Relative formula mass of fuels
- each H - 1, each C - 12, each O- 16