DF1: Getting Energy from Fuels

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14 Terms

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Thermochemistry

the study of the energy and heat associated with chemical reactions

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EXOthermic

gives out energy

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ENDOthermic

takes in energy

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Enthalpy Change

amount of energy transferred to and from the surroundings

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negative enthalpy change

exothermic

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positive enthalpy change

endothermic

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What is enthalpy change affected by?

  1. temperature

  2. pressure

  3. concentration

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Standard Conditions

  1. 298K (25 C)

  2. 100kPa

  3. 1 mol dm-3

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How to convert from Celsius to Kelvin?

add 273

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Standard enthalpy change of reaction

The enthalpy change when molar quantities of reactants as stated in the equation react together under standard conditions.

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specific heat capacity

The amount of energy needed to raise the temperature of 1 kg of substance by 1°C

q= mc/T

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Standard enthalpy change of combustion

when one mole of substance in burned completely in oxygen under standard conditions in standard states

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Standard enthalpy change of formation

when one mole of compound is formed from its elements under standard conditions in standard states

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Standard enthalpy change of neutralisation

when one mole of hydrogen ions react with one mole of hydroxide ions under standard conditions and in solution containing 1 mol dm-3