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15
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The process in which liquid changes into solid on cooling
Freezing
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15
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The process in which solid changes into liquid on heating
Melting
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15
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If a bottle of perfume is opened in one room, the scent quickly spreads to the other room.Why?
Because the gas molecules in perfume are very loosely packed and they move faster spreading everywhere.
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15
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Two substances that sublime
solid carbon dioxide (dry ice), iodine, camphor, naphthalene.
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15
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Sameer blew onto a mirror surface and found that it became foggy. Why?
Because the air he breathed out contained water vapour and that water vapour condensed on touching the cold mirror surface forming a fog.
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15
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True /False: You can change a solid into a liquid by freezing it.
False
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15
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Matter is made up of extremely small particles known as ...................
Molecules
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baam
Lose 25 points!
Oops!
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shark
Other team loses 5 points!
Okay!
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shark
Other team loses 10 points!
Okay!
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thief
Give points!
5
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20
25
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seesaw
Swap points!
Oops!
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magnet
Take 15 points!
Okay!
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gift
Win 25 points!
Okay!
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baam
Lose 20 points!
Oops!
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trap
No points!
Oops!
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star
Double points!
Okay!
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rocket
Go to first place!
Okay!
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baam
Lose 5 points!
Oops!
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thief
Give points!
5
10
15
20
25
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shark
Other team loses 10 points!
Okay!
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shark
Other team loses 25 points!
Okay!
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lifesaver
Give 10 points!
Oops!
15
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When a substance is cooled, the particles..........................
slow down
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15
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Explain how puddles of water disappears on a sunny day.
the liquid water is heated by the sun. The liquid water evaporates and form water vapour.
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15
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The process of solid directly changing into a gas without passing through the liquid phase
sublimation
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15
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True /False: Opposite process of melting is freezing
True
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15
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Three states of matter
solid ,liquid and gas
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×
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