Hyperphysics - brilliant for physical chemistry.
Chemguide -
www.chemguide.co.ukWeb Elements
http://www.organic-chemistry.org/Calculations in AS/A leve chemistry, Jim Clark, Pearson Education, 2000,
ISBN:978-0-582-41127-2 (Book)
Reading is a good university. The learning curve is pretty steep but the lecturers are supportive, the notes are excellent and there are support workshops and stuff that can help you catch up.
I didn't actually write too much on UCAS personal statement because I had no idea what to say either. I think I said that as a mature student, I offered a different outlook and that I felt my age was a positive thing. The Chemistry department is pretty inclusive, which is a really good thing. You'll definitely be interviewed as a mature student from an Access Course.
Read up on:
Equilibria
Kinetics Solids, Liquids, Gases (phase change)
Thermodynamics
I mean, REALLY read up. Look at maths problems as well. That will help you enormously. If you want, I'll send you a copy of my Third Year project. I'm making a booklet for the department for Access students and out of department students that explains first year physical chemistry, or at least a couple of the subjects. A kind of Dummies Guide.
Good Luck