17 Blessy investigates the evaporation of water.
She measures 100 cm of water and puts this into a beaker.
She measures the time for all the water to evaporate.
Blessy repeats the experiment three more times.
Each time she uses a different sized beaker.
beaker D
beaker C
beaker A
beaker B
(a) Blessy always uses 100 cm of water.
Explain why.
reliable test.
so that it be
(b) Blessy thinks that the temperature of the water affects the time taken for all 1
water to evaporate.
Write down a possible prediction for the effect of temperature.
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