A sealed flask contains 2.0 g of water vapour. The flask is cooled until all of the vapour has condensed to liquid water. Which statement about the water in the flask is correct?
The mass has decreased and the density has decreased
The mass has increased and the density has increased
The mass is unchanged and the density has increased
The mass is unchanged and the density is unchanged
40 exam-style questions on AQA GCSE Physics 3.1 Changes of state and the particle model, covering 3.1.1 Density of materials and 3.1.2 Changes of state. Each one has a worked solution and a mark scheme showing where the marks go.