Question

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Answer 1

Answer:

(4) Digestion of food.(d)

(5) Zinc.(d)

(6) A glass cup.............(b)

B. Very short answer type ques.

(1) For a piece of iron to get rusted, it must be in contact with air(oxygen) and water.

(2) A physical change is a reversible change, as the original form of the substance/object can be attained back.

(3) Physical properties can be observed or measured without changing the composition of matter. Physical properties are used to observe and describe matter. Physical properties include: appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, etc.

Explanation: