This is a study guide for students covering the CIE AS Chemistry Syllabus, 2025-2027. It contains many worked problems modeling the applications of stoichiometric rules. It covers the syllabus following sections: 2 Atoms, molecules and stoichiometry 2.1 Relative masses of atoms and molecules 2.2 The mole and the Avogadro constant 2.3 Formulas 2.4 Reacting masses and volumes (of solutions and gases)

This document serves as a study guide for students preparing for the Cambridge International (CIE )AS Chemistry, using the 2025 syllabus. It is a simplified explanation of the topic made for students. It covers the following parts of the syllabus: 1 Atomic structure 1.1 Particles in the atom and atomic radius 1.3 Electrons, energy levels and atomic orbitals 1.4 Ionisation energy

This is a Powerpoint presentation used to explain briefly the rules for assigning electron configuration. Target audience: Secondary Students (AS Chemistry)