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Background Information

This is a neutralisation reaction between an acid (sulfuric acid) and a base (copper carbonate). When a carbonate reacts with an acid, the products...

It's easier than you think! The basic rule for forming the conditional is 'future stem + imperfect tense ending'.

So to form the conditional you need to take the future s...

First thing we have to do is to eliminate one of the variables, either x or y (it doesn’t matter which one). In order to achieve that, we aim to have the same co-efficient (number in front of x or y) o...

Diagrammatically, this is where the demand and supply curves meet. The demand curve shows the quantity demanded by consumers at different prices, and the supply curve shows the quantity producers are w...

The key here is to eliminate one of the variables; it doesn't matter whether we start by trying to get rid of x or y we will arrive at the same solution. For us to eliminate either x or y it is easiest to...