Start with Why Chemical Reactions Happen, a strong bridge from school chemistry into mechanistic, thermodynamic and molecular explanations.
Organic Chemistry — A demanding but rewarding introduction to university-style organic reasoning and mechanisms.
Atkins’ Physical Chemistry — Useful for mathematically confident applicants who want to sample physical chemistry at a higher level.
Molecules — A readable way to connect molecular structure with everyday substances and broader chemical curiosity.
The Periodic Table — A literary, reflective route into the culture and human meaning of chemistry.
For video-based learning, Periodic Videos is useful when you want demonstrations to connect with inorganic patterns. The Royal Institution is better for longer public lectures where you can practise extracting a central chemical argument. Professor Dave Explains is most useful for consolidating school-level topics before moving to harder problems.
For current chemistry, Chemistry World Podcast, Stereo Chemistry, The Episodic Table of Elements are useful starting points.
For structured study, Principles of Chemical Science offers a university-style sequence with lecture materials and problem sets. Khan Academy’s Chemistry Library is best treated as a structured course for consolidating essentials, rather than as another channel to browse casually. Introduction to Chemistry: Reactions and Ratios is useful if stoichiometry and reaction calculations need more guided practice.