Top answers

Why is the argument of a+bi equal to arctan(b/a)?

Think about the point a+bi on the complex plane. Specifically, a is how far along the x (real) axis, and b is how far up the y (imaginary) axis the point is. If you draw a line connecting the origin and the ...
MS
16038 Views

How to plan a A Level History source question?

Extract A Argument Claims: Judgement in response: Factual Information to the validity (or not) of claims: Summary of Paragraph: Extract B Argument Claims: Judgement in response: Factual Information to the va...
ID
Answered by Ines D. • History tutor
3051 Views

Please use the VSEPR theory to predict the shape of NH3 and the approximate bond angles

The student should draw the lewis structure - this should be worked through using the whiteboard 2. From the lewis structure it can be identified that NH3 has 3 bonds and one lone pair of electrons 3. Theref...
AG
Answered by Alisha G. • Chemistry tutor
6234 Views

For the equilibrium reaction PCl5(g) (equilibrium arrow)-> PCl3(g) + Cl2(g) explain the effect of increasing the concentration of Chlorine gas using the equilibrium constant.

Kc=[Cl2(g)][PCl3(g)]/[PCl5(g)] for this reaction. The rate constant is not affected by changes in concentration and hence an increase in the concentration of Chlorine causes an increase in the concentration ...
JH
Answered by James H. • Chemistry tutor
15299 Views

A general function f(x) has the property f(-x)=-f(x). State a trigonometric function with this property and explain using the Maclaurin series expansion for this function why this property holds. Write down the integral in the limits -q to q of f(x) wrt x

Note that this property is the definition of an odd function, or draw a sketch of what this looks like in general about the horizontal axis. E.g. f(x)=sin(x) which has the expansion f(x)=x-((x^3)/3!)+((x^5)/...
JH
Answered by James H. • Maths tutor
4342 Views