2023 june

Question 1

Explain two reasons why more energy is needed to change the solid vaccine into a
liquid at its melting point.

Answer 1

Energy is needed to change the state of a material

Energy is needed to break / weaken the bonds (between
molecules / particles) or overcome attractive forces
(between solid (vaccine) molecules)

Some heat transfer with the surroundings / container

Question 2

“Explain how static electricity can be used to remove particles from a gas using an electrostatic device.”