How Does GCSE Chemistry - Compounds, Molecules & Mixtures (2026/27 exams) Work?

GCSE Chemistry helps you understand how things are made by looking at compounds, molecules, and mixtures, like building blocks for everything around us.

Imagine you have a box of different colored LEGO bricks. Each color represents a type of atom, the tiny building blocks of matter. A compound is when two or more different types of atoms stick together to make something new, like how red and blue LEGO bricks can become a purple brick when stuck together. For example, water is made from hydrogen and oxygen atoms, it’s a compound.

A molecule is just a group of atoms that are all connected in one go, like a LEGO mini-figure, all the pieces are attached to each other in a specific way. So every molecule is a compound too, but not every compound is a single molecule.

Now imagine you have a bag full of different LEGO bricks, some red, some blue, and even some green ones. That’s like a mixture, it's just a group of things that are all mixed together, but they can still be separated if you want to.

So in GCSE Chemistry, you’ll learn how these tiny building blocks come together, or stay separate, to make everything from your favorite snacks to the air we breathe.