Exercises

Every exercise from the courses, in one place. Search for a specific one, filter by subject, or let chance pick one for you.

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Flash questionsShort drills on core skills, as cards to project or print.See the series

1120 exercises

Secret codes: encryption and decryption

Cryptographie – Fondamentaux3 exercises

Short answerBeginner

Deciphering a Caesar cipher

Why the substitution fails

Open answerBeginner

Attacking a short message

Vigenère and the early days of cryptanalysis

Cryptographie – Fondamentaux4 exercises

Short answerIntermediate

Encryption using the Vigenère cipher

MCQIntermediate

Vigenère’s contribution

MCQIntermediate

The terms and conditions for disposable face masks

Open answerIntermediate

The paradox of the disposable mask

The states of matter and changes of state

Chimie – La matière4 exercises

Identifying a change of state

Short answerBeginner

Naming a state change

The temperature range

Open answerBeginner

Mass and volume of an ice cube

Atoms, molecules and ions

Chimie – La matière4 exercises

The neutrality of the atom

Short answerBeginner

Counting the atoms in a molecule

Cation or anion?

Open answerBeginner

Copper and its two faces

Chemical reactions and their equations

Chimie – Transformations4 exercises

Physical or chemical?

Short answerBeginner

Vocabulary relating to reactions

Recognising a balanced equation

Open answerBeginner

Checking an equation by counting

The periodic table of elements

Chimie – La matière4 exercises

MCQIntermediate

Periods and families

Short answerIntermediate

Atomic number of hydrogen

MCQIntermediate

Reactivity of chemical families

Open answerIntermediate

Mendeleev’s wager

The mole and the amount of substance

Chimie – Quantités1 exercise

MCQIntermediate

The role of the mole