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Describe and explain how substances dissolved in blood plasma, such as oxygen and glucose enter the tissue fluid from the capillaries.

Simple molecules are able to move through the capillaries down the concentration gradient. An example of this would be oxygen moving from oxygen rich blood into the surrounding muscle. Other molecules are ab...
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Answered by Samuel H. • Biology tutor
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Write equations and give the mechanism for the reaction of butanone with: 1) NaBH4 and 2) HCN

The first thing we need to do in this type of organic chemical reaction, is identify our electrophiles and nucleophiles. We know that due to the electronegativity of the oxygen atom in carbonyl compounds tha...
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Answered by Harry S. • Chemistry tutor
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Explain why the amount of solar radiation absorbed by the earth's surface varies from place to place.

Land covered in concrete and buildings alters the albedo of a pace because dark colours will absorb, rather than reflect incoming sunlight. This creates 'urban heat islands' where temperatures are higher whe...
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Answered by Alice S. • Geography tutor
9495 Views

How should I structure an essay in an exam?

When writing an essay in an exam, try to ensure that your answer is focused, well structured and supported by evidence. To start with, it is a good idea to create a brief plan for your essay. This should inc...
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Answered by Charlotte K. • History tutor
3104 Views

How can I calculate the maximum value of the compound angle formulae Rsin(x+a) and Rcos(x+a)?

Often, the compound angle formulae can seem quite offputting, especially since exam pressures can mean the random "R" at the front of an angle addition formulae appears confusing. However, finding ...
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Answered by Luke B. • Maths tutor
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