the definitive collection of all the experiments that were published in Roger Frost’s manuals or used on his training sessions. The collection is fully-indexed with keywords and fully searchable by topic or the equipment used
As food burns it releases energy. This energy can be used to heat up a known volume of water and so calculate its energy content. The temperature change can be easily monitored using a temperature sensor. Furthermore, if the food stops burning too soon, the graph will show how much the water cools and you can add this temperature change into your calculations.
When living things respire they use up oxygen. This can be monitored using an oxygen sensor. The living thing can be a plant, animal or microorganism. Maggots, locusts, or yeast are often used and so can pond-weed. If you use Elodea, its container should be kept in the dark or wrapped in foil.
It is also quite easy to show how temperature affects the rate of respiration
– however, in this example, the oxygen sensor should be able to compensate for its own response to temperature changes.
Two experiments: in one amylase catalyses the hydrolysis of starch. Iodine can be used as an indicator to show that the starch has been broken down. A light sensor can be used, like a colorimeter, to monitor this change.
Another experiment aims to show the effect of different temperatures on the action of amylase.This experiment studies
the effect of the enzyme pepsin on protein. Pepsin catalyses the hydrolysis of the protein, albumin into amino acids. As the protein solution is cloudy and amino acids are soluble the liquid changes from cloudy to clear. The light sensor can be used, like a colorimeter, to monitor this change.