A pure solid is heated steadily. Its temperature stays the same while it melts, even though heating continues.
Which statement explains this?
The solid stops taking in energy until all of it has melted.
The particles stop moving while the solid melts, so the temperature cannot rise.
The energy supplied makes the particles bigger, so the temperature cannot rise.
The energy supplied is used to overcome forces between the particles, so the temperature does not rise.
48 exam-style questions on OCR GCSE Chemistry 1.1 The particle model, covering 1.1.1 The particle model and changes of state and 1.1.2 Limitations of the particle model. Each one has a worked solution and a mark scheme showing where the marks go.