A materials scientist studies a pure substance, X, in a sealed chamber. Energy is removed from X between stages P and Q, and more energy is removed between stages Q and R.
Complete the five missing entries in the table.
| Stage | Evidence | State | Change when energy is removed to reach the next stage |
|---|---|---|---|
| P | X spreads out to fill all the available space in the chamber. | ? | ? |
| Q | X flows and takes the shape of the lower part of the chamber. | ? | ? |
| R | X keeps its own shape and volume. | ? | — |
Explain how removing energy causes the particle arrangement to change between stages P and Q.
Explain how the arrangement and the movement of the particles of X change between stages Q and R.
93 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.