English National Curriculum Science
Mission Objectives
Describe how to investigate the effect of temperature on the rate of decay of fresh milk by measuring the pH change
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Words and meanings to learn
decay
To rot or decompose through the action of bacteria and fungi.
denature
To take away or alter the natural qualities of.
moisture
Water or liquid diffused in a small quantity as vapour.
detritivore
An animal which feeds on dead organic material, especially plant detritus.
enzyme
A biological catalyst and is almost always a protein which speeds up the rate of a specific chemical reaction in the cell.
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Resources: A small beaker containing milk (full fat or semi-skimmed, but not UHT), a small beaker containing sodium carbonate solution (0.05 mol dm−3 ), a small beaker containing 5% lipase solution, 250 cm3 beakers, to be used as water baths, test tubes, a test tube rack, a marker pen, 10 cm3 plastic syringes, a stirring thermometer, stop clock / stopwatch, phenolphthalein in a dropper bottle, an electric kettle, for heating water, ice, for investigating temperatures below room temperature.
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