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Explain briefly the separation technique of fractional distillation, with reference to a particular example.

Fractional distillation is used to separate crude oil into its constituent fractions (e.g. petrol, naphtha etc. - names not required)Crude oil is heated to a high temperature and most is vaporised/evaporated...
MH
Answered by Max H. • Chemistry tutor
3622 Views

Explain how vaccination makes a person immune to a disease

Answer: A dead or inactive or weak form of pathogen is introduced. (Don't say Germ)This stimulates white cells / lymphocytes / leucocytes - B and T cells (not phagocytes)to produce antibodies. Antibodies are...
BJ
Answered by Bethan J. • Biology tutor
5055 Views

How do I analyse pronouns in a text?

Firstly, decide whether the pronouns in the text are inclusive or exclusive. Pronouns such as ‘you’ and ‘we’ can be used inclusively to involve the reader in the text. For example, imagine a poster with the ...
JP
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Explain why Hitler and the Nazi Party rose to power in 1933

Hitler’s rise to power at the beginning of the 1930’s can be attributed to the Nazi party’s ability to manipulate the German social, economic and political conditions of the previous decade. The Nazis were a...
JS
Answered by Jordan S. • History tutor
4028 Views

Describe the functions of glycoproteins in the cell surface

Glycoproteins can be antigens , enabling cell recognition of self and non-self cells. They also act as receptors for molecules such as hormones and drugs and pass on signals to intracellular components. Hydr...
RN
Answered by Ruth N. • Biology tutor
26767 Views