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Physical And Chemical Changes

Question

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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)

Solution

(a) False

Cutting a log of wood into pieces is a physical change.

(b) False

Formation of manure from leaves is a chemical change.

(c) True

(d) False

Iron and rust are different substances. Rust is iron oxide $({Fe}_{2} O_{3})$

(e) True

Some More Questions From Physical and Chemical Changes Chapter

Explain why rusting of iron objects is faster in coastal areas than in deserts.

The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change − A) then it burns (Change − B). The following statements pertain to these changes. Choose the correct one.
(i) Process − A is a chemical change.
(ii) Process − B is a chemical change.
(iii) Both processes A and B are chemical changes.
(iv) None of these processes is a chemical change.

Anaerobic bacteria digest animal waste and produce biogas (Change − A).
The biogas is then burnt as fuel (Change − B). The following statements pertain to these changes. Choose the correct one.

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