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During which two changes of state does gas become a liquid?
Evaporation and crystallisation
Boiling and condensation
Sublimation and melting
Boiling and evaporation
What is sublimation?
The physical change from solid directly to gas
The chemical change from gas to solid
The chemical change from solid directly to gas
The physical change from gas to solid
The internal energy of a system is equal to the total kinetic energy in particles in the system.
True
False
Explain why a change of state can happen if a substance is cooled.
The particles lose energy and form bonds.
The particles lose energy and break bonds.
The particles gain energy and break bonds.
The particles gain energy and form bonds.
Why does heating a system makes the particles move faster?
It transfers energy away from the system.
It transfers energy to the particles' kinetic energy stores.
It transfers energy away from the particles.
It transfers energy to the particles' chemical potential.
The more energy in the kinetic energy store of a particle the...
Slower it moves.
Faster it moves.
What can happen to a system when its internal energy increases?
The temperature will rise.
The solid will become a gas.
The system will change state.
The temperature will rise or the system will change state.
Why is mass conserved when a substance changes state?
The number of particles changes.
Energy cannot be destroyed or created, only transferred.
The number of particles stays the same.
What is meant by "physical change"?
A chemical reaction has happened.
New substances are formed.
The process is irreversible.
No new substances are formed.
What is meant by "physical change"?
The substance can recover its original properties.
The substance cannot recover its original properties.
The internal energy of a system is equal to the total kinetic energy and potential energy in particles in the system.
False
True
