2nd Year

The states of the matter We can consider 3 different states –gas, liquid and solid– and a melange of them. One important difference between the three states of the matter is the volume they occupy. A gaz takes all the

Oxido-reductions, or redox, are reactions involving a transfer of charge between molecules.  During such reactions, some chemical energy is transformed into electrical energy. An oxidation reaction is a reaction during which a substrate (molecule, atom or ion) loses electrons. A reduction reaction is a reaction

Atoms make liaisons because they get more stability. A proof is that to break a liaison, we need to give energy to the molecule. Atoms in a molecule are at a given distance, and oscillate slightly from this position depending

The table of Mendeleev is also called the periodic table of the elements. More than a simple list of the existing atoms. Mendeleev sorted the elements with regard to their oxidation/reduction by O/H  R20  R0                  

Let’s resume what we know from the atoms: atoms can be broken and are composed of charged species – protons and electrons – and neutral particles – the neutrons. Atoms are different for each element (or isotope) by the number