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How does fractional distillation work?

Different length hydrocarbon chains are separated by their different boiling points as longer chains will have stronger intermolecular attractions. The crude oil is heated and injected into the base of the c...
BS
Answered by Bianca S. • Chemistry tutor
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How is a polar bear adapted for it's environment? (4 marks)

Polar bears are well adapted for survival in the Arctic: White fur to camouflage themselves from prey on the snow and ice. Thick layers of fat and fur for insulation against the cold. Small surface area to v...
RM
Answered by Ruwani M. • Biology tutor
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The destruction of habitat can lead to the extinction of animals. Name 3 other disadvantages of deforestation.

Soil erosion Eutrophication Global warming Less transpiration
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Answered by Ally W. • Biology tutor
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Find dy/dx at t=3, where x=t^3-5t^2+5t and y=2t^2

Using the product rule, we find that dy/dx= dy/dt multiplied by dt/dx, where dt/dx is the reciprocal of dx/dt dx/dt= 3t^2-10t+5, dy/dt= 4t At t=3, dx/dt= 3(3)^2-10(3)+5=2, dy/dt= 4(3)= 12 Therefore, dt/dx= 1...
OA
Answered by Oore A. • Maths tutor
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A) Multiply out 6(n - 2). B) Factorise psquared - 5p

A) 6n - 12 B) p(p-5)
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Answered by Ally W. • Maths tutor
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