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What is the difference between the perfect and imperfect tense?

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.

Answered by Jane G. • French tutor

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a sample of hydrated NiSO4 witha mass of 4.414g is heated to remove all water crystallisation. The resultant mass is 2.287g. How many H2O molecules to each NiSO4 were there in the original sample

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 ...

Answered by Calum S. • Chemistry tutor

2955 Views

What do I do if I don't know the answer to the professor's question?

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...

Answered by Tom R. • Oxbridge Preparation tutor

2478 Views

Is there such a thing as pure, rational knowledge? Would mathematics fall into this category?

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...

Answered by Tom R. • Philosophy tutor

2466 Views

How should I structure my essay?

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...

Answered by Tom R. • TSA Oxford tutor

3327 Views