Have you realised that each of you have a chemistry lab inside your own house? Yes, the kitchen. Have you ever wondered what happens when rice is steamed, or potatoes are fried, or cakes are baked?

http://www.rsc.org/Education/Teachers/Resources/kitchenchemistry/resources4_2.htm

Kitchen Chemistry is a collection of information about various experiments to study the chemistry of food and cooking, put together by the Royal Society of Chemistry. There are also some video clips available for some of the experiments. Not all experiments can be done at home with common materials, and some of them involve some advanced chemistry, but still you could take a look at it and see if you can figure them out.