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The perfect tense is used when the action being described has been completed while the imperfect tense implies that the actions is still ongoing or does not have a definite ending.

Mr of NiSO4 is 154.8 g/mol Mr of H2O is 18

Mass of NiSO4 in sample is 2.287 g Mass of H2O in sample is 4.414-2.287 = 2.127g

divide mass of each of NiSO4 and H2O by Mr to obtain the ratio in ...

Don't worry, they are doing this on purpose! Oxbridge interviews aren't meant to trick you, but they are meant to test how you cope with new information and working things out on your own.

The inte...

This is a classic epistemological question asking you to engage with the debate between rationalists like Descartes and empiricists like Hume. To answer this effectively we need to make clear what the opp...

The TSA essay can be very off-putting - unlike normal exams, you can't revise lots of facts and the chances are the questions are not going to match what you've been studying for A levels/IB. But Oxford p...