Now we get to probably one of the most interesting parts of the AQA C3 course – the organic chemistry. Not excited already? You get to understand what formula alcohol has, what is actually in vinegar and how they actually make perfumes. Doesn’t sound interesting to you? Well, unfortunately, that’s just too bad, because you need to know it for the AQA C3 exam. Ready (and hopefully excited)? Then let’s go for it…

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One of the most basic fuels (or, at least, mixture of fuels) around – and for the C1 exam, you have to know all about it. What it actually is, different fractions, and how to separate them – this and more is stuff you need to know. So, let’s guess what we’re going to cover here… that’s right, everything about crude oil that you need for the C1 exam. Ready? Here we go…

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reversible reaction symbol

This is a quick one, believe it or not. A reversible reaction is simply what it says on the tin – a reaction that can go both ways.

So if the products of a chemical reaction can react to produce the reactants, we can say that this is a reversible reaction – meaning that the reaction can go in both directions.

Want an example? Here’s one:

ammonium chloride ⇌ ammonia + hydrogen chloride

Here, you can see that the ammonium chloride can be thermally decomposed in order to form ammonia and hydrogen chloride. However, when cooled, this products react to form ammonium chloride again – a perfect example of a reversible reaction

 

And that’s about it for reversible reactions – a quick topic, to be sure. You won’t need any specific examples in the exam, but you may be given information about other types of reversible reaction or other specific reversible reactions in the exam. As ever, it’s a case of applying knowledge where you can.

Hope this helped!