Question

A) Fill in the blanks.

1- Formation of day and night is ______change.

2- Bursting of cracker is a _____ change.

3- The glowing of a tube-light is ____ change.

4- Formation of rust on a bicycle rim is a _____ change.

5- Energy is _____ in the formation of curd from milk.


B) Write true or false.

1- Cooking of rice is a physical change. ____

2- Germination of seed is a physical change. ____

3- Breaking of china (porcelain) is a chemical change. ____

4- Rusting of iron is an irreversible change. _____

5- Eruption of volcano is a periodic change. _____

6- Formation of clouds is a fast change. _____


C) Classify the following as reversible or irreversible change.

1- Melting of wax - 2- Falling of rain -
3- Pulling of rubber string -
4- Tearing of a paper -
5- Evaporation of water -


D) Indicate whether each of the following changes is slow or fast ; reversible or irreversible ; desirable or undesirable ; period or not periodic ; and physical or chemical :

1- Different phases of moon.

2- Lighting in the sky.

3- Formation of biogas from cow dung.

4- Combustion of petrol in an automobile engine.

5- Formation of manure from dry while lives in a pit.

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Answer 1

Answer:

PLEASE ASK QUESTIONS ONE BY ONE.

Explanation:

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Answer 2

Here are your answers:

A)

1) physical/chemical

2) chemical

3) physical

4) chemical

5) conserved

B)

1) False

2) False

3) False

4) True

5) True

6) False

C)

1) Reversible

2) Irreversible

3) Reversible

4) Irreversible

5) Reversible

D)

1) Slow, reversible, desirable, periodic and physical change

2) Fast, irreversible, undesirable, non-periodic and chemical change

3) Slow, irreversible, desirable, non-periodic and chemical change

4) Fast, irreversible, desirable, periodic ( if the vehicle is running) and chemical change

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