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Year 5 ICAS Complete Practice Bundle sample

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A class compares how much salt dissolves in water at 20, 40 and 60 degrees Celsius. Which procedure gives the fairest comparison?

AUse equal water volumes, measured salt portions and the same endpoint.BUse different water volumes and stop each trial after a different time.CChange the type of salt whenever the water temperature changes.DEstimate the salt by eye and stir one container much longer than the others.