Many of the books I have reviewed so far are fiction, and it is indeed difficult to find fiction with a high reading level that will still be comprehensible to young readers. Then again, you could just offer books about how to blow stuff up.
I stumbled across this post, which suggests some very challenging reads. In particular, I was drawn to Uncle Tungsten: Tales of a Chemical Boyhood, a non-fiction book where the author talks about his childhood love affair with chemistry. Set around the time of World War II, he conducted experiments that even an adult might not be able to perform today, given restricted access to things that might light your hair on fire. At a reading level of 10.7 this will challenge any advanced reader, and might ignite a desire for dangerous experiments as well.
You’ve been warned.
If your budding chemist is interested in experiments that can actually be performed in 2010 without alerting the ATF or Homeland Security, you might check out 101 Incredible Experiments for the Weekend Scientist. In a moment of temporary insanity, I bought this for my husband for Christmas. As if the man needed more encouragement to store explosive devices in our basement. It includes experiments to create a “stinktastic bomb” similar to the one the military is researching to find an odor “so vile that it renders enemy soldiers unable to fight.” I think Dark Omen may be perfecting this experiment in his room. Other experiments are more benign, including the ever-popular Non-Newtonian Fluid (otherwise known as slime, flubber, or Polymer Polyvinyl Acetate). All use ordinary household items, and probably require adult supervision, unless you have really good insurance and don’t mind singed eyebrows.