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15
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Give one example of a liquid that can solidify.
Examples: water to ice, melted wax to solid wax.
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15
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Why do solids keep their shape?
Because the particles are tightly packed and cannot move freely.
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baam
Lose 20 points!
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seesaw
Swap points!
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gift
Win 10 points!
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baam
Lose 15 points!
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15
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Give one example of a chemical reaction.
Examples: burning wood, mixing cement powder with water, rusting of metal.
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15
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What is solidifying?
Solidifying is when a liquid changes into a solid by cooling.
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seesaw
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fairy
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25
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gift
Win 25 points!
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banana
Go to last place!
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15
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How are particles arranged in a solid?
Particles in a solid are packed tightly in a regular pattern.
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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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15
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Why do iron cans and cars sometimes turn a reddish-brown color?
Because the iron reacts with oxygen and forms rust.
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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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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 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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lifesaver
Give 25 points!
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rocket
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gift
Win 25 points!
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baam
Lose 25 points!
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15
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Is the change of state a physical or chemical process? Explain briefly.
Physical process; the substance stays the same, only the state changes.
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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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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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