Biology experiment. Investigating the effect of temperature on the surface tension of water

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BIOLOGY HIGHER LEVEL

Internal Assessment

Investigating the effect of temperature on the surface tension of water

November 2010

Will increasing the temperature affect the surface tension of water?

If the temperature of the water is increased, then it will reduce the capacity of the surface tension as increasing temperature increases the kinetic energy of the water molecules, causing them to move faster, thus having less cohesive forces and surface tension.

Figure I: Risk assessment of possible hazards

Figure II: Independent, dependent and controlled variables in the experiment

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1x 20 cent coin

1x Beaker (250cm3)

1x Hot plate (± 0.05oC)

1x Pipette

1x Thermometer (± 0.5oC)

1x Water bath (± 0.05oC)

Water (250cm3)

Figure III: Diagram of Apparatus

  1. Set the water bath to 10.0oC
  2. Set the hot plate to 10.0oC
  3. Pour approximately ...

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