Why are different alcohols used in the investigation?

To compare the energy released during the combustion of ethanol, propanol, butanol and pentanol.

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What equipment is used to measure the temperature change?

A thermometer.

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What safety precautions should be taken when using spirit burners?

  1. Don't move the spirit burner when lit.
  2. Ensure room is well ventilated.
  3. Tie long hair back.
  4. Don't leave the spirit burner unattended.

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What is the aim of the investigation into combustion of alcohols?

To investigate the temperature rise produced in a known mass of water by the combustion of the alcohols ethanol, propanol, butanol and pentanol.

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Why do different fuels produce different amounts of heat during combustion?

Because they have different energy contents per unit mass.

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What property is measured to compare the energy released during combustion of the alcohols?

The temperature increase of a known mass of water heated.

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What should you do before moving a spirit burner?

Make sure the spirit burner is no longer lit.

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Why should long hair be tied back during this experiment?

To prevent loose hair from catching fire.

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Why should the room be well ventilated during this experiment?

To prevent build up of toxic or flammable vapors.

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