Periodic Table of Videos
December 01, 2015
This website, from the University of Nottingham, has a great collection of chemistry videos, including videos for every element on the periodic table and many others that are particularly interesting (some of which I might post separate links and descriptions for, where particularly relevant to specific topics).
Most videos are especially suited to GCSE students (KS4) but many of them are appropriate for A Level or KS3 students.
Resources others found helpful
This document creates a mini-booklet with simple, step-by-step instructions for adding and subtracting fractions with different denominators.
Recommended reading for Years 6 and 7 (ages 9-12)