A block of paraffin wax is heated until it melts completely. The liquid wax is then placed in a sealed container and heated further until it completely vaporises.
What happens to the total mass of the wax during these changes of state?
Melting: decreases; vaporisation: increases
Melting: stays constant; vaporisation: stays constant
Melting: increases; vaporisation: decreases
Melting: stays constant; vaporisation: decreases
321 exam-style questions on CIE IGCSE Physics 2.1 Kinetic particle model of matter, covering 2.1.1 States of matter and changes of state, 2.1.2a Particle structure and motion in solids, liquids and gases, 2.1.2b Gas pressure and particle collisions, 2.1.2c Brownian motion, 2.1.3a The absolute scale of temperature, and 2.1.3b Pressure, volume and temperature of a gas. Each one has a worked solution and a mark scheme showing where the marks go.