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White paint costs £2.80 per litre. Blue Paint costs £3.50 per litre. White paint and blue paint are mixed in the ratio 3:2 Work out the cost of 18 litres of the mixture.

The mixture has a ratio of 3:2, white to blue paint. 3+2=5 so there are 5 parts to the mixture, 3 white and 2 blue. We know the cost of 1 litre of each, so first we can work out the cost of 1 litre of the mi...
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Answered by Henry B. • Maths tutor
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Explain why an atom has no overall charge.

An atom is comprised of protons, neutrons, and electrons. Protons have positive charge and the number of protons is dictated by the proton number, which is the same as the number of electrons, which have neg...
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Answered by James C. • Chemistry tutor
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Write down the equation for the Gibbs Free Energy change of a reaction. Hence explain why, for a spontaneous endothermic reaction, there must be an increase in the total entropy.

Gibbs Free Energy change: (delta)G = (delta)H - T(delta)S For a spontaneous chemical reaction, (delta)G must be negative. An endothermic reaction has a positive (delta)H value therefore, in order for the rea...
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Answered by James C. • Chemistry tutor
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To what extent was the ideological divide between the west and the USSR responsible for the development of the Cold War?

This essay will argue that whilst the ideological divide was extremely significant, it was not the sole responsible factor in the development of the cold war. Arguments that support it being responsible: -Fo...
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Answered by Halima N. • History tutor
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How do I structure an English literature essay at A-Level?

Structure is integral to achieving the top marks, and can make all the difference between writing a good essay and writing a great essay. At A-Level you have probably learnt to structure your essay into thre...
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