Revision sheets
Short sheets to read the night before the test: the essentials to know by heart, the method in the order that works, and the mistakes that cost the most marks.
Middle school
High school
The mole and amount of substance
The four relations that give an amount of substance, how to pick the right one, and the unit traps that cost the most marks.
12 min4 topics · 3 pitfalls
Balancing a redox half-equation
The five-step method, in the order that actually works, and how to combine two half-equations without leaving electrons behind.
15 min4 topics · 3 pitfalls