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Physical and Chemical Changes

How is the so...

Question

How is the souring of milk a chemical change?

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Solution

Souring of milk is a chemical change because original substances present in milk lose their nature and identity and form new chemical substances.

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Q. Souring of milk is a chemical change.

How can you show curdling of milk is a chemical change?

Q. Write True (T) or False (F) against the following statements in the given brackets:
1. Souring of milk is a physical change. ( )
2. Digestion of food is a physical change. ( )
3. Crystallisation is widely used to prevent rusting. ( )
4. Formation of steam from water on heating is a physical change. ( )
5. Glowing of the filament of a bulb is an example of a chemical change. ( )

Q. Match the items of Column I with the items of Column II.

Column - I	Column - II
a. Large crystals	i. Turns lime water milky
b. Depositing a layer of zinc on iron	ii. Physical change
c. Souring of milk	iii. Rust
d. Carbon dioxide	iv. Carbon dioxide
e. Iron oxide	v. Chemical change
f. Dissolving common salt in water	vi. Galvanisation

Q. State whether the following statements are true or false. Rewrite the false ones correctly.
(a) All irreversible changes are chemical changes.
(b) A liquid can sublime.
(c) The evaporation of water take place only at 100°C. when it is boiling.
(d) The melting of ice is a physical change.
(e) The souring of milk is a periodic change.
(f) The flowering of trees is a periodic change.
(g) Solidification and condensation are the same.
(h) The breaking of glass tumbler is a chemical change because it is irreversible.
(i) Boiling, evaporation and condensation are physical changes.

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