Drop an ice cube into a glass of water and watch what happens: a solid turns to a liquid, and eventually — if you leave the glass out long enough — the water disappears into the air as a gas. The same water molecules do all three. What changes is not the substance, but the arrangement of its particles and how they move. That is the entire story of states of matter, told in one glass.
Understanding this allows you to predict whether a substance will be a solid or a gas at room temperature, explain what happens at the flat sections on a heating curve, and write equations with the correct state symbols. These skills appear on almost every GCSE chemistry paper.
This introduction covers The Ice Cube in Your Drink within States of Matter for GCSE Chemistry. Revise States of Matter in Atomic Structure for GCSE Chemistry with 12 exam-style questions and 10 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 1 of 13 in this topic. Use this introduction to connect the idea to the wider topic before moving on to questions and flashcards.
Practice questions for States of Matter
Which of the following best describes the arrangement of particles in a solid?
A heating curve shows a flat section (plateau) when a solid is being heated to become a liquid. Explain why the temperature does not rise during this flat section. [3 marks]