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15 Cards in this Set
- Front
- Back
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Fuels are burned to produce energy - this is an ? reaction |
Exothermic - heat is released |
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All hydrocarbons undergo combustion |
combining with oxygen produces CO2 and water |
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Natural gas is : |
Methane CH4 + 2O2 gives Co2 + 2H2O |
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Petrol: |
Produces 48,000 kj per kg |
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Ethanol also used in cars |
29,700 kj per kg |
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Methanol in racing cars |
20,000 kJ per kg - but can be extinguished by water, hence safer |
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A fuel is a..... |
Substance burned to produce energy |
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The products formed by burning hydrocarbons can be identified: |
Condensation = water present if bubbled through lime water = cloudy means presence of CO2 |
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Petrol is obtained from: |
Crude oil, hence will run out one day |
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Ethanol is obtained from: |
Plant fermentation, hence renewable. |
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Energy values from fuels are measured by a : |
CALORIMETER |
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How does it work: |
Heat given off by burning fuel heats a known mass of water |
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Must measure the: |
mass of water initial temp of water final temp of water |
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then use the equation: |
Eh = cm (deltaT) |
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Balance equations predict the mass of reactants needed or the mass of product produced. |
MASS MOLES | FORMULA MASS |
