I wanted to teach my kids with New Senior Secondary Physics at Work (Second Edition), but I couldn't find the official answers anywhere — and I'm not a teacher, so Oxford's teacher resources are off limits to me.
So I worked out the solutions myself. Here they are, for anyone else in the same boat — parents helping their kids, or students studying on their own.
Read my Book 1 — Heat and Gases solutions (PDF). It opens right in your browser and covers the Checkpoint and Practice sections in Chapters 1–5, with full working.
One caveat: these are my own answers, not Oxford's official marking scheme. There may be mistakes, so check any step that doesn't look right to you.
If you do spot a mistake, please let me know — I'll fix it and update the PDF so everyone gets the corrected answers.