Unité 1.1 La matière PART 1: Les substances pures

Characteristics of Matter00:00:26

Matter is defined as anything that has mass, occupies volume, consists of particles in constant motion, and surrounds us. It excludes energy.

Atoms and Molecules00:01:25

Atoms are the smallest particles of matter. They cannot be created or destroyed in chemical reactions but combine in fixed, whole-number proportions to form molecules.

Elements and Symbols00:02:29

Elements consist of one type of atom and cannot be simplified further. They are represented by international symbols following specific naming rules, such as using uppercase followed by lowercase letters.

Compounds and Chemical Formulas00:04:11

Compounds are pure substances made of different types of atoms bonded together. Chemical formulas use indices to show the exact number of atoms of each element in a molecule.