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What are the products of the reaction between an acid and a base?

A salt and water (H 2 O). H + from the acid and OH - from the base combine to make water. The salt formed depends on the acid and base counterions, and is usually dissolved in water.
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Answered by George H. • Chemistry tutor
7834 Views

How do I structure an essay properly?

It's actually really easy to do your essay structuring right. I always followed this formula and still do! I use PEE. This is simply Point, Evidence, Example. So, if the question is, 'how did Hitler gain pow...
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Answered by Annabelle T. • History tutor
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Write tan(3x) in terms of tan(x). Hence show that the roots of t^3 - 3t^2 - 3t + 1 = 0 are tan(pi/12), tan(5pi/12) and tan(3pi/4)

The first part is relatively simple. If we write tan(3x) as tan(2x+x) we can use addition formulae to give: tan(2x+x)= (tan(2x)+tan(x))/(1-tan(2x)tan(x)) tan(2x) = 2tan(x)/(1-tan^2(x)) Substituing this in an...
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Answered by Daniel G. • Maths tutor
53897 Views

differentiate y = (4-x)^2

This is a basic example of a very important result: the chain rule. The difficulty of this sort of example is that we have a "function of a function". That is, we have the function '4-x' and then w...
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Answered by Ben B. • Maths tutor
8746 Views

Differentiate y=e^(x^2+2x)

For this question the chain rule should be used, the chain rule is that dy/du*du/dx=dy/dx. If we say u=(x 2 +2x) and therefore y=e u Then du/dx=2x+2 and dy/du=e u. Then dy/du*du/dx= (2x+2)e u , then we can s...
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Answered by Duncan F. • Maths tutor
15456 Views