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