The Big Question: Has a New Substance Formed?
The Big Question: Has a New Substance Formed?

Chemistry is the study of substances and how they behave. When something changes, it might only alter its appearance or state, or it might turn into a completely different material.
Step-by-step lessons on CIE IGCSE Chemistry Physical and chemical changes. Each one builds up to exam-style questions. Build a solid grasp of atomic structure, bonding and the mole concept early, since these underpin almost every other topic, then move on to the more calculation-heavy quantitative and organic chemistry content.