In this lesson, our S4 Chemistry tutor goes through some MCQ question on energy changes using graphs and comparisons.
Our S4 Chemistry tutor uses diagrams and graphs to go through the difference between exothermic and endothermic reactions.
Our S3 Chemistry tutor goes through the arrangements and movements of particles in solid, liquid and gaseous states.
In this lesson, our S3 Chemistry tutor explains the electronic configuration, number of protons and neutrons, and relative atomic mass of some elements in the periodic table.
Our S4 Chemistry tutor goes through the factors that affect speed of reaction like pressure and particle size.
In this lesson, our S3 Chemistry tutor explains how one of the separation techniques – paper chromatography – works.