What crude oil is
What crude oil is
Crude oil is a naturally occurring dark liquid found underground, but it is not one pure substance. It is a mixture of many compounds, so its components are not chemically bonded to each other.
Step-by-step lessons on Edexcel IGCSE Chemistry Crude oil. 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.