Collect the chalk dust Add a little water to the dust to make a paste. Roll it into the shape of a piece of chalk. Did you recover chalk from the dust?
Reversible Change
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5
Change no new substance is formed.
Physical Change
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5
When carbon dioxide is passed through lime water, it turns milky due to the formation of _________.
Calcium carbonate
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5
Magnesium (Mg) + Oxygen (O2) ---------
Magnesium oxide
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5
Cutting a log of wood into pieces is a chemical change.
False
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5
Boil some water in a container. Do you see the steam rising from the surface of water? Hold an inverted pan by its handle over the steam at some distance from the boiling water. Observe the inner surface of the pan. Do you see any droplet o
Condensation
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boom
Lose 50 points!
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gold
Win 50 points!
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shark
Other team loses 10 points!
Okay!
lifesaver
Give 20 points!
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banana
Go to last place!
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rocket
Go to first place!
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fairy
Take points!
5
10
15
20
25
lifesaver
Give 25 points!
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5
Changes in which only _________ properties of a substance change are called physical changes.
physical
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monster
Reset all scores!
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star
Double points!
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shark
Other team loses 25 points!
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banana
Go to last place!
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5
Properties such as shape, size, colour and state of a substance are called its
Physical properties
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lifesaver
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gift
Win 15 points!
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shark
Other team loses 20 points!
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thief
Give points!
5
10
15
20
25
5
Changes in which new substances are formed are called _________ changes.