Chemistry: Age 15

8 illustrated Chemistry lessons for Age 15.

Electron shells and valence electrons Electrons fill shells around the nucleus in order: the first shell holds 2, then the next shells fill up one a…
Inside the Atom Every atom has a tiny, heavy core at its center, with much lighter particles moving around it at a distance. A…
Electron shells in atoms Atoms have a central nucleus made of protons and neutrons, with electrons arranged in shells around it. The ou…
One Mole of Water and Salt A mole is a counting unit, like a dozen, but it contains 6.022 × 10²³ particles. It links a weighed or measure…
Mass Concentration g/L Mass concentration tells how many grams of solute are dissolved in each litre of solution. You can reach it by…
Earth and Moon Rock Minerals Earth rocks and Moon rocks contain mineral crystals that can be compared under a lens. Similar mineral signatu…
Watering Down a Colour The same amount of blue dye is spread through more and more water as you move along the rack. Because the dye …
Inside an Atom Almost all of an atom's mass is packed into a tiny clump at its centre, which takes up nearly none of its volu…