Science Geek has a large file of Chemistry Review activities, and they are converting them to html5 (which means Chromebook compatible). Many of their interactive resources are already Chromeboook ready.
Based on theory of knowledge and brain science, Biology Q&As was specifically designed, written and organized to make learning biology easier. More than 1800 bite-sized Q&As, covering all of the primary branches and subjects in biology, are available to make studying biology as easy as possible.
Education Quizzes offers a wide range of quizzes on a variety of topics. It is American in its content, but science crosses all borders.
This tool should be used as a supplemental tool and for practice quizzes. It requires payment to have an account, but the quizzes can be used without logging in.