1.Which of the following is a Chimical change?
A.Painting a wall blue
B.A bicycle rusting
C.Ice cream melting
D.Scratching a key across a desk
2.Some fishermen make a dried fish.What makes the fish changed chemically?
A.The fish was put under the tree
B.The fish was put under the shadow
C.The fish was put under sun's heat
D.The fish was put under the table
3.Rust occurs when iron is exposed to oxygen.What will you do to avoid metals from rust?
A.Keep it properly
B.Put it exposed to air
C.Put it where water is near
D.Both A and C
A.Painting a wall blue
B.A bicycle rusting
C.Ice cream melting
D.Scratching a key across a desk
2.Some fishermen make a dried fish.What makes the fish changed chemically?
A.The fish was put under the tree
B.The fish was put under the shadow
C.The fish was put under sun's heat
D.The fish was put under the table
3.Rust occurs when iron is exposed to oxygen.What will you do to avoid metals from rust?
A.Keep it properly
B.Put it exposed to air
C.Put it where water is near
D.Both A and C
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Answer:
1, B
2,C
3,A
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