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An observer is on top of a lighthouse. How far from the foot of the lighthouse is the horizon that the observer can see?

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Which dilutions can you make using only 10ml pipettes?


chemNRICH is the area of the stemNRICH site devoted to the mathematics underlying the study of chemistry, designed to help develop the mathematics required to get the most from your study of chemistry at A-level and university.

Global Warming

Age 14 to 16 Challenge Level:
 It is not envisaged that this problem would be used as a class problem.  It is more appropriate for an enthusiastic student or small group of students looking for a challenge to work on independently.