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Describe how to separate hydrocarbons of different lengths

Heat the oil up until it is a vapour Pass into fractionating column Negative temperature gradientHydrocarbons of different lengths have different boiling points They condense at different heights and are col...
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Answered by Mia N. • Chemistry tutor
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a)By completing the square, prove the quadratic formula starting from ax^2+bx+c=0, b) hence, or otherwise solve 3x^2 + 7x -2= 9, to 3s.f.

a)starting from ax 2 +bx+c=0, divide through by a, x 2 +(b/a)x+c/a=0, complete the square (x+(b/2a)) 2 -(b/2a) 2 +c/a=0, expand (x+(b/2a)) 2 -(b 2 /4a 2 )+c/a=0, Combine fractions and rearrange,(x+(b/2a)) 2 ...
YH
Answered by Yusuf H. • Maths tutor
4062 Views

Describe the differences between different types of blood vessels

Capillaries-one cell thick, minimal diffusion distanceveins-wise lumen, many elastic fibres, valves presentarteries-thick muscular layer to withstand BP
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Answered by Bela V. • Biology tutor
2987 Views

Write about an inspirational person in your life (100 words)

This would be regarded as a writing task. The student would need to apply the following grammar rules: Correct use of case endings (where possible)Use of conjunctions / variety of conjunctionsUse of present,...
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Answered by Anna L. • Russian tutor
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Solve 7x + 6 > 1 + 2x

To solve a question we want to get the x terms and one sides, the variables, and the numbers on the other side, the constants.7x + 6 > 1 + 2xSubtract 2x from 7x so we only have x terms on the left hand si...
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Answered by Philip M. • Maths tutor
3660 Views