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Name and explain the process in which crude oil is separated into fractions. (5 marks)

The process is fractional distillation : the separation of a mixture using heat. The crude oil is heated and the mixture will evaporate . The mixture will then rise up the column and cool as it rises as the ...
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Answered by Emily P. • Chemistry tutor
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Assess the extent to which models and theories, such as the North-South Divide and dependency theory, are useful in helping to understand the development gap

The Development gap refers to the widening difference in levels of development between the world's richest and poorest nations. There are a number of models and theories that exist to explain this gap such a...
Answered by • Geography tutor
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How should I plan my essay?

STEP ONE: BREAK APART YOUR QUESTION Highlight key words, Write a simplified version of the question if necessary. Our aim is to understand every part of the question completely. STEP TWO: FIND YOUR OVERARCHI...
Answered by • English Literature tutor
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How do I identify that the coordinate (2,3) is the maximum point of the curve f(x)?

Start by finding the first derivative of the function - by differentiating f(x) with respect to x. Then substitute the x-coordinate, in this case 2, into the first derivative and it will equal zero if (2,3) ...
Answered by • Maths tutor
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Explain the sliding filament theory of muscle contraction

Muscle contraction begins after an action potential reaches the required muscle and causes the calcium ion protein channels on the sarcoplasmic reticulum to open. This allows the calcium ions to diffuse down...
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Answered by Isabel L. • Biology tutor
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