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Let y=arcsin(x-1), 0<=x<=2 (where <= means less than or equal to). Find x in terms of y, and show that dx/dy=cos(y).

First, the question asks us to find x in terms of y, or in other words, rearrange the equation to be in the form ' x= ' , rather than ' y= ', as it is currently. We start with y=acrsin(x-1) , as given in the...
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Answered by Kalina M. • Maths tutor
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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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Q3. A third beaker, C, contains 100.0 cm^3 of 0.0125 mol/dm^3 ethanoic acid ( Ka = 1.74 × 10^−5 mol/dm^3 at 25 ºC). Write an expression for Ka and use it to calculate the pH of the ethanoic acid solution in beaker C.

A3. Ethanoic acid is a weak acid with the formula CH3COOH. It will dissociate into H+ and CH3COO- therefore the expression for Ka is [H+][CH3COO-]/[CH3COOH] The [H+] = [CH3COO-] and so the expression becomes...
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