Curious Chemist Handbook - Fun Experiments, Big Discoveries

An acid is like a sour superhero, let’s call him Acidus, that loves to give away tiny pieces called protons (or H⁺ pieces). The stronger he is, the more protons he can donate as H⁺. This increased concentration of H⁺ ions in water makes a solution acidic.

In chemistry, intermolecular interactions are molecular interactions between neighbouring molecules, governed by attractive and repulsive forces. 

A great experiment to demonstrate the existence of atoms is Brownian motion, originally observed by Robert Brown in 1827. 

Here’s how the curious chemist in you can try it: