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This qustion can be solved easily using the gradient formular, m = ∆y/∆x, and some simple algrebra.
The gradient at the point x = 2 is calculated by find the gradient of a tangent at x = 2. To find...
The subjunctive is one of the most important new aspects of Spanish grammar learnt at A Level. It is actually far more simple than people make it out to be, and Spanish speakers use it all the time! It is...
First of all we have to determine how much of the acid is dissociated, which we can do by determining the concentration of Hydrogen ions. We can work that out from the pH. pH=2, which means [H+...
In order to solve this question we simply must substitute x=1 into f(x). But what is f(x)? What does it actually mean to make a subsitution? f(x) has a fancy name attached to it called a funct...
As you go down the group, what changes? The number of shells.
As you go down the group, what doesn't change? The number of electrons in the outer shell - it is always one.
For group 1, they ...
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