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
Some challenging problems for KS1, this mixed review has a little bit of everything, mainly as word problems.
An in-depth look at how to persuade and argue effectively, using the "AFOREST" list of persuasive techniques.