Chemistry - Word Equations (AQA)

Unfortunately, even just writing the words 'chemical equation' send shivers down the spines of many students who see them as really complicated to do and there are so many to learn as well, aren't there? Actually, no, you don't need to learn many, but how come?

In most cases, for reactions involving metals, there are fairly simple rules that you can follow. For example, if you know that metal carbonates react with strong acids to form the metal salt, water and carbon dioxide, and you know which salt comes from which acid, you are able to write a word equation for the reaction of any metal with the acids that you know about - that's around 300 word equations from a couple of simple pieces of information. If you haven't realised that, then chemical equations are going to be tough for you because you will have to learn them all individually! You will only be asked to write them for reactions you have come across during your studies.

For reactions between non-metals (including hydrocarbon fuels burning), it is a bit more complex. For example, the reaction of sulfur with oxygen:

sulfur + oxygen → sulfur dioxide.

You would need to know the product is sulfur dioxide and not sulfur oxide - but if you think about it, it is always sulfur dioxide that you will have heard of during your study of science.