A student models melting with marbles in a tray. At first the marbles are packed in rows. When the tray is shaken gently, the marbles move about and the rows break up.
Which feature of real melting does this model fail to show?
The particles move more as the substance is heated.
The regular arrangement of the particles is lost.
Energy is needed to overcome the forces of attraction between the particles.
The particles stay the same size when the solid melts.
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.