Elements, Mixtures and Compounds

This topic covers elements, mixtures and compounds.

Reflections: This topic was rather much a HUGE headache for me. First of all, as I had previously said, I am a TERRIBLE memorizer ( pardon the English). There were 20 elements to memorize and i also had to remember the groups and periods. Well, I did it eventually but that was not even close to the hard part. The hard part was the mixtures and compounds. I had to differentiate between a compound and a mixture, and also to remember which mixtures were mixed from what and which compounds were formed from which elements. This is kind of hard, considering the fact that there are 16 million organic (carbon-containing) compounds in the world. And those are only the carbon containing ones. Also, as I did research on this topic, unexpectedly I learnt something very interesting. Somehow, I saw the wiki page on elements had the link 'Matter', so I clicked on the link and read the page. I learnt that not everything in the world is made up of matter. In fact, less than only 17%of matter in the universe is made up of ordinary matter. The rest are a mysterious kind of matter called dark matter which naturally accounts for 83%.