Read pages 112 to 113 and then do the following calculation.
In an experiment similar to the one on p 113, a pupil started with 150 cm3
of air. At the end of the experiment there only 30 cm3 of air were left. Calculate the volume of air used up and the percentage of air used up.
% air used = vol of air used divided by vol of air at the start then divide your answer by 100.
Then do questions a ans 3 on page 116.
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