Question

I. Fill in the blanks with the appropriate words for each of the statement given

below.

1. Change of milk to curd is a……….(desirable/undesirable)

change.

2. If change is permanent & irreversible it is considered a ……….

(chemical/physical) change.

3. Sublimation involves a …….. (chemical/physical) change.

4. Melting of ice is a …….(reversible/irreversible) change.

II. Answer the following

1. Differentiate between the following.

i) Periodic and non- periodic change.

ii) Desirable and undesirable change.

iii) Natural and man-made change.

iv) Reversible and irreversible change.

v) Slow and fast change.

2. Differentiate between physical and chemical change with reference to,

i) Nature of change i.e. temporary and reversible or permanent and

irreversible.

ii) Formation of products.

3. Photosynthesis is a natural process by which green plants manufacture

food in the presence of sunlight.

i) Are any new compounds formed during the above process?

ii) Can the change be reversed or is irreversible.

iii) State the conclusion, photosynthesis is a physical or chemical

change?
4. State which of the following pertain to,

A: Physical change B: Chemical change

i. burning of paper

ii. photosynthesis

iii. melting of ice

iv. curdling of milk

v. melting of candle

vi. freezing of water

vii. sublimation

viii. magnetisation of iron

ix. rusting of iron

x. Respiration​

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

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