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How does paper chromatography work?

Paper chromatography is a technique used to separate coloured chemicals, such as a mixture of inks and dyes. A spot of the mixture to be analysed is spotted onto the bottom of a thin piece of chromatography ...
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Answered by Adam G. • Chemistry tutor
5898 Views

Solve the following system of equations simultaneously to find the values of x, y and z. 2x+3y+4z=3, -x-y+z=1, 2x+y-z=0

First scale one of the equations so that upon addition or subtraction from another of the equations we cancel one of the 3 variables, next do this again replacing one of the equations used with the unused eq...
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Answered by Shaun A. • Maths tutor
3093 Views

What is the process that transports dissolved sugars around a plant?

Translocation
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Answered by Eloise C. • Biology tutor
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A right-angle triangle has three sides (diagram would be included). Side A = 3cm; Side B = 7cm. What is the length of Side C (the hypotenuse)? Give your answer to 2 d.p.

Using Pythagoras' Theorem --> a 2 + b 2 = c 2 (or c = SqRT(a 2 + b 2 )) where c is the hypotenuse.Substitute a = 3; b = 7. So: 3 2 + 7 2 = c 2 9 + 49 = 58. SqRt(58) = 7.62. Side C = 7.62 cm
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Answered by Ashley S. • Maths tutor
3735 Views

In a chess club there are x boys and y girls. If ten more boys join and one more girl joins, there is an equal amount of boys and girls. Knowing that y = 2x+2, Calculate x and y. [4 marks]

There are x boys and y girls. So x = boys, y = girls. Ten boys join so x + 10 = boys, one girl joins so y + 1 = girls. These values are said to be equal, so we construct an equation with x and y. x + 10 = y ...
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