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first of all it is best to get rid of the brackets. You do this by times each component in the bracet by the number on the outside in this case it is 2.
7x + 8 = 12x - 4
then you want to get...
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 ...
Two methods for simultaneous equations: making them equal to each or substitution. If they both have a common term, for example "y", then you can do substitution, otheriwise find a way to make t...
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