What is the melting point of pure Z?
The pure sample of Z started boiling at 9 minutes. It was then boiled for 2 minutes. Use this information to sketch on the grid how the temperature of the pure Z sample changed between 9 minutes and 11 minutes.
The pure sample of Z was heated continuously from 2 minutes to 5 minutes. Explain, in terms of attractive forces, why the temperature of the pure Z sample did not rise between 2 minutes and 5 minutes.
Describe how the motion of particles of pure Z changed from 0 minutes to 2 minutes.
The experiment was repeated with a solid sample of impure Z. Suggest any differences between the melting point and boiling point of impure Z and those of pure Z. melting point ............ boiling point ............
A pure sample of Z was cooled from $120^\circ\text{C}$ to $20^\circ\text{C}$. The total time taken was 8 minutes. Starting from point X, sketch on the grid how the temperature of the pure Z sample changed between 0 minutes and 8 minutes.