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What is distillation?

Distillation is a process used to seperate a liquid from a mixture of different liquids. It works on the basis that liquids have different boiling points. A common example is ethanol and water. The liquid wi...
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Answered by Emma C. • Chemistry tutor
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Describe how crude oil is separated into fractions

Crude oil is separated by fractional distillation. Crude oil is heated to vaporize the different hydrocarbons in a tank which is cool at the top and hot at the bottom. The vapours then rise and the different...
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Answered by Paul I. • Chemistry tutor
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What are chromosomes?

Chromosomes are thread-like structures that are found in the nucleus of the cell. They contain many genes which are sections of DNA that code for a particular protein. These proteins will give an individual ...
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Answered by Emma C. • Biology tutor
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Describe how different environmental factors affect the direction of growth of roots and shoots making reference to plant hormones

Shoots grow upwards towards light and away from gravity, while roots grow downwards towards moisture and with gravity. Plants produce an uneven distribution the hormone auxin causing unequal growth rates of ...
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Answered by Paul I. • Biology tutor
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What was the greatest threat to Britain's position as a world power in the years 1874-1901?

OVERSEAS COMPETITION - Russia (1874-1885) - balance of power in Balkans and Med., threatening India and British trade dominance in China Germany (1885-1905) - threatened British colonial dominance in Africa,...
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Answered by Athavan B. • History tutor
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