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How do I know which method of diffirentiation to use?

The main methods of differentiation you need to know at A level are the chain rule, the product rule and the quotient rule. The chain rule should be used when the eqation is a function of a function. E.g. y=...
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Answered by Lizzie C. • Maths tutor
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Although carbon dioxide is a linear molecule it is still a greenhouse gas. Explain why that is.

A greenhouse gas is one which absorbs infrared radiation from the Earth and re-radiates it, increasing the surface temperature of the Earth. Normally these molecules are non-symmetrical such as triflurometan...
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Answered by Lorenzo C. • Chemistry tutor
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Garlic contains a chemical called Allicin which has antimicrobial properties. Describe how this could have occurred through natural selection.

Allicin has antimicrobial properties and can therefore protect garlic from fungal and bacterial infections and is coded for in the DNA of the garlic by an allele. The presence could have been the result of w...
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Answered by Lorenzo C. • Biology tutor
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Describe the photoelectric effect and what it tells us about the properties of light .

The photoelectric effect describes the process by which surface electrons are emitted from a metal when light is shined on it. This occurs because the electrons are able to absorb the electromagnetic energy ...
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Answered by Lorenzo C. • Physics tutor
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How do you use the pythagoras equation?

Used for right angled triangles where c is the hypothenuse and a and b are the two other sides. Equation: a 2 + b 2 = c 2 Label the sides of the triangle before starting. To find the length of c you do the r...
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Answered by Patricia S. • Maths tutor
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