What's everything made of?
Think of aluminium foil, what is it made of? What if I cut it into really small bits? Is it still aluminium foil?
Now think of water, what is it made of? What if I separate just one small drop, is it still water?
![](https://image.jimcdn.com/app/cms/image/transf/dimension=74x10000:format=jpg/path/s50875d8a2e624705/image/iaa5b3ab80eb4351b/version/1571252037/image.jpg)
Are you sure?
Let's do a little experiment, what is happening? Why is the water turning different colours? What are these bubbles?
![](https://image.jimcdn.com/app/cms/image/transf/dimension=268x10000:format=png/path/s50875d8a2e624705/image/i5d33e6da9b63cdf7/version/1571250466/image.png)
Aluminium and Water are different
While aluminium is made of only one thing, water is made of two different things or "elements": oxygen and hydrogen
These two parts get together to form a water "molecule". Think of it as a lego block
![](https://image.jimcdn.com/app/cms/image/transf/none/path/s50875d8a2e624705/image/i8a1f43cbc9dfd03f/version/1571250770/image.jpg)