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Describe and explain the shape and bond angle of ammonia

So firstly, we need to work out the basic shape of the molecule which we can do by drawing the lewis structure (dot and cross diagram) and counting the number of charge clouds around the central atom. In the...
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Describe how water is carried by the transpiration stream (7)

Transpiration is the water loss from the plant via evaporation. The transpiration stream is the flow of water through the plant xylem from the roots to the leaves of the plant. Xylem are thin tubes where the...
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Prove that the square of an odd number is always 1 more than a multiple of 4

Let n be any whole number. Any odd number can be written as 2n+1. Any odd number squared is therefore (2n+2) 2 =2n 2n+2 2n+1=4n 2 +4n+1=4(n 2 +n)+1. n 2 +n is a whole number, so 4(n 2 +1) is a multiple of 4....
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prove that lnx differentiated is 1/x

let y = lnx therefore e^y = x then differentiating both sides we get: dy/dx (e^y) = 1 dy/dx = 1/(e^y) and as e^y = x dy/dx = 1/x when y = lnx
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Find the coordinates of the point of intersection of the lines 2x + 5y = 5 and x − 2y = 4.

Rearrange both equations to make y the subject:2x + 5y = 5 rearranges to y = -2x/5 + 1 and x - 2y = 4 rearranges to y = x/2 - 2Equate both the rearranged equations and solve for x:-2x/5 + 1 = x/2 - 2x = 10/3...
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