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Butan-2-ol cannot be directly converted to 1,2-dibromobutane. The conversion can be carried out in two stages by first converting butan-2-ol into X, which is then reacted with bromine.(continued in answers)

butan-2-ol --?→ X --Br 2 → 1,2-dibromobutane(a) State the name and draw the structural formula of X(b) State an equation and the conditions needed for the conversion of butan-2-ol into X.(c) Describe the mec...
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Answered by Kiril T. • Chemistry tutor
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Electrons moving in a beam have the same de Broglie wavelength as protons in a separate beam moving at a speed of 2.8 × 10^4 m/s . What is the speed of the electrons?

de Broglie wavelength formula: λ = h/mv, whereλ = wavelength,h = Planck's Constant = 6.626 x 10 -34 Js,m = mass of object,v = object's velocity, Mass of proton m p = 1.6726219 × 10 -27 kg,Velocity of proton ...
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Answered by Haider A. • Physics tutor
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Find the general solution of the equation tan(2x + pi/2) = SQRT(3), giving your answer for x in terms of π in a simplified form.

Assume y = 2x + pi/2, Since the period of 'tangent' is pi, the general solution of 'y' to valid the equation of tan(y) = SQRT(3) is the form of y = n pi+pi/3 where 'n' is any positive or negative integer and...
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Answered by Chunlong H. • Maths tutor
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How do you write "Evaluate the usefulness of the source" questions?

This is a 6 mark question, which I answer using an anagram which helps you to remember each of the points you need to include to achieve full marks. The anagram I use is: TACL which stands for Time, Author, ...
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Answered by Emma L. • History tutor
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How do you assess the validity of a historical source?

A good acronym to remember when assessing sources is DAMIT. D = Date: When was the source produced? Did any major historical events take place around this date? Is the source typical of the time? How long af...
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Answered by Georgia F. • History tutor
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