A candle flame What's a combustion reaction? When two molecules bump into each other under the right circumstances, they may exchange electrons in ways that change both molecules into new kinds [...]
Using magnifying glasses to focus sunlight and start a fire Be careful with fire! Be very careful with fire, because it can burn you, or burn down your house. If [...]
Diagram of an oxygen atom When a star has changed all of its hydrogen atoms into helium, it turns into a red giant and moves on to convert the helium atoms into [...]
A rusty sign You can easily see that iron rusts and turns red when oxygen touches it. Go look around your backyard or your neighborhood and try to find ten things [...]
