Glossary
Plain words, in the order you meet them.
- Atom
- Smallest bit of an element; protons + neutrons in the middle, electrons outside.Met at stop 2 · Atoms
- Element
- One kind of atom (oxygen, iron).Met at stop 2 · Atoms
- Compound
- Joined elements in fixed ratio (water).Met at stop 4 · Bonding
- Mole
- 6.02×10²³ particles — the chemist's counting heap.Met at stop 5 · Moles
- Molarity
- Moles per litre of solution.Met at stop 9 · Solutions
- Ion
- Charged atom (lost or gained electrons).Met at stop 2 · Atoms
- Isotope
- Same element, different neutrons.Met at stop 2 · Atoms
- pH
- The 0–14 acidity scale.Met at stop 10 · Acids & bases
- Catalyst
- Speeds a reaction without being used up.Met at stop 11 · Energy & rates
- Polymer
- Long chain of repeats (plastics, starch).Met at stop 12 · Carbon