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