Curriculumbits seems to have an array of interactive modules, quizzes, and/or e-learning tools for many subjects. There are not any ads on these online interactives.
Search Chemistry and you will find – Elements and Compounds, Alkalis and Acids, Combustion, and Reactions.
Search Geography and you will find natural disasters, longshore drifts, and types of rainfall for example. There are video resources and resources for P.E., History, Geography, Biology, Chemistry, Art and Design, Technology, Performing Arts, Math, and English.
This tool is great to use to explain or teach something to students in a new way or a different way, as we know not all students understand the way you teach/taught the material. They have access to these at home too for more practice or discovery.