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i)Explain why first ionisation energy shows a general tendency to increase across a period? ii)Using period 3 as an example, which elements show irregularities in this trend and why?

i)As you move across a period the number of protons in the nucleus, and so the overall nuclear charge, increases. All extra electrons are roughly the same energy and distance from the nucleus. This means ...

DM
Answered by David M. Chemistry tutor
6706 Views

To what extent should the period of Conservative dominance between 1951 and 1964 be viewed as "Thirteen Wasted Years"?

This first thing to do when answering an essay question is to read and analyse the question, and to understand what it is that the examiner is asking and looking for. It is helpful to break down the title...

AM
Answered by Annabel M. History tutor
4450 Views

How do I write an A* grade essay?

The key to writing a successful essay at A-level & GCSE is to always have the Assessment Objectives in your head (it might even help to write them down as part of your plan). It is a common complaint ...

JT
8235 Views

A Curve has parametric equation x=2sin(t), y= 1+cos(2t), -pi/2<=t<=pi/2. a) Find dy/dx when t=pi/3. b) Find the Cartesian equation for the curve in form y=f(x), -k<=x<=k. c) Find the range of f(x)

x=2sin(t), y=1+cos(2t)

a) By chain rule, dy/dx = (dy/dt)/(dx/dt)
dy/dt = -2sin(2t), dx/dt= 2cos(t)
dy/dx= -sin(2t)/cos(t)
dy/dx=-2sin(t)cos(t)/cos(t)
dy/dx=-2sin(t)

MB
Answered by Max B. Maths tutor
10321 Views

Find the first and second derivatives of: y = 6 - 3x -4x^-3, and find the x coordinates of the line's turning points

dy/dx = -3 +12x^-4 d^2y/dx^2 = -48x^-5

MS
Answered by Matthew S. Maths tutor
3311 Views

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