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Physical and Chemical Changes

No. A (i) ...

Question

No. A (i)

A) Classify the following changes is as many ways of possible

(i) Growth of a tree
(ii) Weathering of a rock

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Solution

i) Growth of a tree is a chemical change as never its going to be its seed again. That is its not reversible.

ii) Weathering of a rock is a physical change as there is no change in chemical composition.

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Q. Classify the following as slow or fast change:
(i) Bearing of heat
(ii) Change of seasons
(iii) Burning of paper
(iv) Weathering of rocks
(v) Melting of wax
(vi) Cooking of food
(vii) Burning of wax
(viii) Melting of ice cream
(ix) Curdling of milk
(x) Formation of day and night.

Q. Classify the following as physical or chemical changes :
(i) Formation of curd from milk
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Q. Question 1 (a)
Classify the following as chemical or physical changes:
a. Cutting of trees

Q. Statements: All plants are trees.
No tree is a tole.
All toles are green.
Conclusions: I. All plants being green is a possibility.
II. No green is a tree.

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(i) Cooking of food (ii) Boiling of water

(iii) Cutting of trees (iv) Dissolving salt in water

(v) Digestion of food (vi) Melting of ice

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