Schools Science Clips - Reversible and irreversible changes. KS2 Bitesize Science - Changing states : Play. KS1 Bitesize Science - Kitchen Materials. StudyJams! - Water Cycle | Scholastic. Scottish 1st Level Bitesize Sciences - Water Explorer. StudyJams! - Solids, Liquids, & Gases | Scholastic. Schools Science Clips - Changing state. Schools Science Clips - Gases around us. The properties of solids, liquids and gases. CATIE testing time. Schools Science Clips - Solids and liquids.