B.1.1—Molecular states Topic Practice
B.1.1—Molecular states Topic Practice
Practise comparing solids, liquids and gases using particle spacing, motion and forces, including why water’s density is unusual.
How this is tested
- compare solid, liquid and gas particles at the same temperature by linking spacing, motion and force strength
- explain why most solids are denser than liquids using same mass, smaller volume and closer particle packing
- use water’s density anomaly to explain why ice floats and how surface ice helps liquid water below remain unfrozen