Why does magnesium react with sulphuric acid???
Well you know that it will react,your sudden realisation that you don’t know why is a very good sign.The reason is that magnesium is much more reactive than hydrogen and simply acts like a school bully and pinches the sulphate radical,leaving the oxygen to combine with the hydrogen to make water.Later you will learn that most reactions that occur spontaneously give out quite a lot of heat.