Tom Green explains the covalent bonds between carbon and methane, and he represents them using a Lewis Dot Structure. Tom then explains how to read the structure. He also gives some background information on Gilbert Lewis, the creator of the Lewis Dot structure and one of the most influential chemists in history.
Ionic bonding is a type of chemical bond that involves the attraction between oppositely charged ions. Unlike covalent bonds, ionic bonds do not share electrons; instead, they donate or accept electrons.
An introduction to the properties of H2O and its components: hydrogen and oxygen. This clip also explains that water has highest cohesion of any nonmetallic liquid, which allows other substances to stick to it.