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Describe and explain the trend in boiling points in the first four hydrogen halides

HF has the highest boiling point this is followed by HI, then HBr with HCl having the lowest boiling point of the four molecules. This is because HF is able to form Hydrogen bonds whereas the other three mol...
TM
Answered by Theo M. • Chemistry tutor
61900 Views

Differentiate xcos(x) with respect to x.

How do we know which method of differentiation to use in this example? Well in ‘xos(x)’, we have 2 different functions: ‘x’ and ‘cos(x)’. Therefore, we must differentiate using the product rule. What is the ...
OS
Answered by Oliver S. • Maths tutor
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'Othello's virtue and valour ultimately make him admirable.' To what extent to do you agree with this view? (AQA A level English Literature question)

As a Venetian soldier, Othello holds a great deal of valour within his society, despite being an outcast due to his race. However, his virtue and valour are greatly undermined when he is prayed on by Iago, w...
KI
Answered by Katie I. • English tutor
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The length of a rectangle is five times the width. The area of the rectangle is 1620 cm(squared) Work out the width of the rectangle.

If the length is 5 times the width we can say that length=5a if width=a. We know the equation for: the area of a rectangle= length x width.In this case: area= 5a x a= 5a 2 and from the question we know that ...
SJ
Answered by Sophie J. • Maths tutor
11529 Views

What 2 reagents are required to form NO2+ (state conditions)? Write an equation for this reaction.

Concentrated sulphuric acid (H 2 SO 4 ) and concentrated nitric acid (HNO 3 ).H 2 SO 4 + HNO 3 -> HSO 4 - + H 2 NO 3 + H 2 NO 3 + <-> (equilibrium arrow, do not penalise if normal arrow used ) H 2 O...
EC
Answered by Eleanor C. • Chemistry tutor
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