States of Matter

Worked examples (12)extended set

• 1Particle diagrams and the properties of the three states
• 2Naming the changes of state
• 3Reading a heating curve (multiple choice)
• 4Interpreting a cooling curve in particle terms
• 5Choosing the correct cooling curve (multiple choice)
• 6Cooling a gas in a sealed container
• 7Gas syringe in a water bath: temperature and gas volume
• 8Which change pushes gas particles closer together? (multiple choice)
• 9Why boiling takes longer than melting
• 10Deducing states from melting and boiling points
• 11Cooling-curve practical: plotted results and an anomalous point
• 12Temperature and pressure acting together on a gas

Model answers (6)

• ✓Model answer — Paper 2 multiple-choice / short-answer style
• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) calculation style

Worked examples (12)extended set

• 1A coloured crystal spreading through water
• 2Why diffusion is faster in gases than in liquids
• 3Which gas is detected last? (multiple choice)
• 4Ranking gases by rate of diffusion
• 5Timing litmus colour changes in two tubes (multiple choice)
• 6Nitrogen dioxide diffusing into air and into a vacuum
• 7Ammonia along a tube of litmus strips
• 8Why a helium balloon shrinks faster
• 9Temperature and the rate of diffusion in agar jelly
• 10The porous pot and the manometer
• 11Identifying gas X from where the white ring forms
• 12Planning an investigation into temperature and diffusion

Model answers (6)

• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 short-answer style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 4 (Extended) structured style
• ✓Model answer — Paper 6 (Alternative to Practical) style