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15
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The more energy in the kinetic energy store of a particle the...
Slower it moves.
Faster it moves.
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15
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During which two changes of state does gas become a liquid?
Evaporation and crystallisation
Boiling and condensation
Boiling and evaporation
Sublimation and melting
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15
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What can happen to a system when its internal energy increases?
The temperature will rise.
The temperature will rise or the system will change state.
The system will change state.
The solid will become a gas.
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15
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What is meant by "physical change"?
New substances are formed.
A chemical reaction has happened.
The process is irreversible.
No new substances are formed.
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seesaw
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shark
Other team loses 10 points!
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gift
Win 20 points!
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thief
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15
×
What is meant by "physical change"?
The substance can recover its original properties.
The substance cannot recover its original properties.
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15
×
The internal energy of a system is equal to the total kinetic energy in particles in the system.
False
True
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15
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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.
False
True
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15
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Explain why a change of state can happen if a substance is cooled.
The particles gain energy and break bonds.
The particles gain energy and form bonds.
The particles lose energy and form bonds.
The particles lose energy and break bonds.
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15
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What is sublimation?
The physical change from gas to solid
The chemical change from solid directly to gas
The physical change from solid directly to gas
The chemical change from gas to solid
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15
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Why does heating a system makes the particles move faster?
It transfers energy away from the particles.
It transfers energy to the particles' chemical potential.
It transfers energy away from the system.
It transfers energy to the particles' kinetic energy stores.
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15
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Why is mass conserved when a substance changes state?
The number of particles stays the same.
Energy cannot be destroyed or created, only transferred.
The number of particles changes.
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heart
Other team wins 25 points!
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seesaw
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rocket
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thief
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25
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heart
Other team wins 20 points!
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shark
Other team loses 25 points!
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shark
Other team loses 10 points!
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thief
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