Well, why not research it by looking at what kids do at science fairs? Either that, or quiz him. What's he wonder about? What mystifies him? What question would he like to try to answer?
You should try "200 Illustrated Science Experiments for Children." The pictures help my son quite a lot. It makes it easier for him to conduct the experiment.
Science for the fifth grade with experiments by Percy Elliot Rowell.
Publisher-The A-to-zed, 1913
Original from the University of California
lenght 198 Pages
Subject - science
Deals with good experiments.
welcome dear.as your son is in fifth grade,he will be smart and tender.for such kids i suggest a book by name "101 SCIENCE EXPERIMENTS" . This book contains all types of science project works and experiments.Good luck.