GCSE Science learning topics and material for students in Year 7 to Year 11.
A reaction may happen when two or more chemicals are mixed. Sometimes you have to add heat (energy) before the reaction will occur. Not all chemicals react together when they are mixed.
You probably know by now (through your studies of chemistry) that electrons are the “magic” behind chemical reactions. They do all the hard work – moving here, moving there, joining this atom, leaving that atom, forming bonds, etc.
If you’re taking a chemistry class or even a general science class, chances are pretty good that you have a copy of the Periodic Table of Elements.
By moving through the cell membrane, substances can enter and leave the cell. Three of the most common types of movement are diffusion, osmosis, and active transport.
Distillation is a method of purifying liquids based on their boiling points. If you have a mixture of multiple liquid compounds, all of which boil at different temperatures, distillation is probably your best bet for a powerful but economical method of separation.
All living things are made of cells – they're the building blocks of every organism on the planet. But different organisms have different cell structures.
