Question: What are molecules?

Nicholas Pearce answered on 16 Nov 2015:

Hey,

Molecules are collections of atoms that are joined together.
You can think of atoms as being like letters and then molecules are like words – you can join letters together to make words. Change the order of the letters, the number of letters or which letters they are and you have a new word. Do this with atoms and you have a new molecule.

And just like you can join words together to make sentences, you can join molecules together to make more complicated things, like the cells in your body!