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What is the trend in electronegativity of group 7?

The electronegativity is the tendency of an atom to attract electrons towards itself in a covalent bond. The electronegativity of the halogens decreases down the group as the radius of each atom increases du...
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Answered by Seetal A. • Chemistry tutor
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Why is the index of refraction important for light passing between two materials?

It's important information as it tells you how fast light travels through the material. This can give you an insight into how the angle of refraction of the light is related to the angle of incidence at the ...
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Answered by Oliver P. • Physics tutor
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How do I structure a 30-mark extended essay answer? (OCR Geography A2 level)

The first thing to do is make a plan. Spend 5-10 minutes doing this to make sure you fully understand what the question is asking. Briefly write what you want to include in your introduction, main body and c...
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The line l is a tangent to the circle x^2 + y^2 = 40 at the point A. A is the point (2, 6). The line l crosses the x-axis at the point P. Work out the area of triangle OAP.

This will involve drawing a diagram to aid your answer. Where O is the origin, A is a point on the circle and P is a point on the x-axis. OA is the radius of the circle. Line l crosses through point A and me...
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Answered by Tutor51285 D. • Maths tutor
34466 Views

List 3 differences between a plant cell and an animal cell

Plant cells have choloroplasts and animal cells do not, plant cells have a vacuole and animal cells do not, plant cells have a cell wall while animal cells only have a membrane
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Answered by Gal B. • Biology tutor
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