Chapter 3: Physical and Chemical Changes

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Q
Physical and Chemical Changes

Question:

State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.

(a) Cutting a log of wood into pieces is a chemical change. (True/False)

(b) Formation of manure from leaves is a physical change. (True/False)

(c) Iron pipes coated with zinc do not get rusted easily. (True/False)

(d) Iron and rust are the same substances. (True/False)

(e) Condensation of steam is not a chemical change. (True/False)

Answer:

(a) Cutting a log of wood into pieces is a chemical change. (False)

The log of wood is a substance that is cut down into smaller wood pieces. So, the bigger wood changes into smaller wood pieces. This means that the physical appearance of wood changes but the chemical composition of the wood remains the same. So, it is a physical change.

(b) Formation of manure from leaves is a physical change. (False)

The green leaves decomposed to form manure. This means that the chemical composition of the green leaves changes to form a new substance, that is manure. So, it is a chemical change.

(c) Iron pipes coated with zinc do not get rusted easily. (True)

(d) Iron and rust are the same substances. (False)

Rust is formed when iron metal is exposed to moist air. Rust or hydrated iron oxide s a brown layer on the iron metal. So, iron and rust are two different substances.

(e) Condensation of steam is not a chemical change. (True)


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