YOUR SUBJECT LESSONS
Chemistry
Connect mass, amount and concentration.
- 01Identify the species and the quantities available.
- 02Use consistent units and a balanced relation.
- 03Check conservation and the order of magnitude.
FROM PRINCIPLE TO PRACTICE
Lessons in a useful order
From foundations to high school: a mental model, worked example and four exercises with solutions per chapter.
Chemistry
Atoms, ions and molecules
Nuclei contain positive protons and neutral neutrons; electrons are negative.
Lesson and 4 exercisesChemistry
The mole: connect mass and particles
Amount of substance counts entities in defined-size groups called moles.
Lesson and 4 exercisesChemistry
Solutions: concentration and dilution
Molar concentration divides solute amount by final solution volume.
Lesson and 4 exercisesChemistry
Balance a reaction equation
Reaction equations conserve each element’s atoms and total charge.
Lesson and 4 exercisesChemistry
Reactions: ratios and limiting reagent
A reaction equation conserves atoms and charge.
Lesson and 4 exercisesChemistry
Redox: follow the electrons
Oxidation loses electrons; reduction gains them.
Lesson and 4 exercisesChemistry
Acids and bases: proton transfer
A Brønsted acid donates a proton; a base accepts one.
Lesson and 4 exercisesChemistry
Kinetics: rate and reaction time
A rate measures change per unit time.
Lesson and 4 exercisesChemistry
Chemical equilibrium: stable composition, active reactions
At equilibrium, forward and reverse reactions continue at equal rates, giving stable bulk composition.
Lesson and 4 exercisesChemistry
Titration: use equivalence
Titration determines an unknown amount using a suitable reaction with known-concentration solution.
Lesson and 4 exercisesFurther reading
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