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15
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When a liquid loses heat and becomes solid again, what is this change of state called?
Freezing or solidifying.
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trap
No points!
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star
Double points!
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shark
Other team loses 25 points!
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baam
Lose 25 points!
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15
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Is change of state a physical or chemical process?
It is a physical process.
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15
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What is the difference between a material and a substance?
A material is what an object is made from; a substance is a pure material (not mixed).
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15
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Why can liquids change shape easily?
Because the particles can slide past each other.
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eraser
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seesaw
Swap points!
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gift
Win 15 points!
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thief
Give points!
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15
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What is melting?
Melting is when a solid changes into a liquid by heating.
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15
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What happens to the particles in a solid when heat is added?
They gain energy, move faster, and move further apart.
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What happens to melted metal after it cools?
It solidifies and becomes a solid again.
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Why do solids keep their shape?
Because the particles are tightly packed and cannot move freely.
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15
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Why must metals like gold and silver be heated to very high temperatures to melt?
Because metals require very high temperatures to melt.
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15
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What happens to water particles when they are cooled?
They move slower and become more tightly packed (solidify).
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Why do scientists use particle models?
To explain how substances behave using particle arrangements and movement.
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boom
Lose 50 points!
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rocket
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fairy
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25
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baam
Lose 10 points!
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15
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What happens to the particles in a liquid when it cools down?
The particles move slower and closer together.
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15
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Why do solids melt when they gain enough energy?
Because the particles gain enough energy to move away from each other.
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