What is this website? How can it help me?

In this website you will find the HTML5 adaptation of the textbook "Practice Makes Permanent 350+ Questions for AQA GCSE Chemistry". This means that you can read this material easily on every device (PC, tablet or smartphone), without having to frequently zoom in and out. This website is built in a way that reading will always be comfortable and enjoyable on whatever device you are using.

How do I show the answer?