Over the past few weeks, my class has been learning about Chemical Reactivity, which focuses on how different substances react and what causes reactions. I've never really studied chemistry properly, so I learnt a lot of things over the course of the unit. Balancing chemical equations was probably my favourite. Chemical equations relate closely to algebra, a topic in Mathematics, which is another one of my favourite subjects. Applying the concepts of algebra into scientific equations was very fascinating. I also learnt about electron shells, valence electrons and how the atomic number of an element specifies it's position on the periodic table. In fact, I found this topic so interesting that I probably won't forget any of these concepts by the time I move into High School. However, I would have liked to learn more about ionic and covalent bonds, because it was a topic we only touched on.