A smell spreads through a room from an open bottle of perfume. Which statement about the gas particles explains this?
They are pulled towards areas with fewer particles
They expand in size until they fill the whole room
They vibrate in place and pass the smell along
They move randomly and spread out among air particles
84 exam-style questions on Edexcel GCSE Chemistry 3.1 States of matter, covering 3.1.1 The three states of matter and changes of state. Each one has a worked solution and a mark scheme showing where the marks go.