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Briefly discuss Le Chatelier's Principle. Ammonia is made in the Haber Process (3H2(g) + N2(g)<-> 2NH3(g)). Using Le Chetelier's Principal, what happens to the equilibrium yield of ammonia when...: A) Temp increases, B) Press increases C) Catalyst changes

Le Chetelier's Principal gives us a guide to work out what will happen when we change the conditons of a reaction in dynamic equilibrium. It states that if the dynamic equilibiurm is disturbed, the equilibri...
JC
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...
JC
Answered by James C. • Chemistry 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...
IB
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How can I use a plan to help me write an essay?

The first, and perhaps most important, step is to 'deconstruct' the essay question. Essentially what you need to do is find 'the heart' of the question, this will usually allude to a certain thesis that you ...
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Answered by Halima N. • English tutor
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A truck with mass 1200kg is moving at 8m/s when it collides head-on with a stationary car of mass 800kg. As they collide, the vehicles move together with the same velocity, v. Calculate this velocity.

Momentum is conserved. MU + mu = (M+m)v (1200 x 8) + (800 x 0) = (1200 + 800)v 9600 = 2000v v = 9600/2000 = 4.8m/s
RH
Answered by Rachel H. • Physics tutor
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