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AQA practicals – Decay (not combined science)

Investigate the effect of temperature on the rate of decay of fresh milk by measuring pH change.

Use appropriate apparatus to record temperature and pH.
The use of appropriate apparatus to measure anaerobic decay.
Safe use of microorganisms.
Measurement of rate of decay by pH change.

Use scientific theories to make a hypothesis about the effect of temperature on rate of decay.
Carry out experiments with due regard for the correct manipulation of apparatus, the accuracy of measurements and health and safety considerations.
Make and record observations and measurements.
Evaluate method and identify possible improvements.
Calculate rate changes in the decay of biological material.
Translate information between numerical and graphical form.
Plot and draw appropriate graphs selecting appropriate scales for the axes.

Typical questions