Do you think the formation of rust from iron is a chemical change?

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Solution

Chemical change:
Chemical change when a substance combines with another substance it forms a new substance, this phenomenon is called a chemical change.
Chemical changes are irreversible changes, therefore it cannot be reversed
When iron reacts with water and atmospheric oxygen a reddish-brown layer of hydrated iron oxide is formed which is called rust.
$\underset{Iron}{4 Fe (s)} + \underset{Oxygen}{3 O_{2} (g)} + \underset{Moisture}{{xH}_{2} O (g)} \to \underset{Ferric Hydroxide}{2 {Fe}_{2} O_{3} . {xH}_{2} O (s)}$
This is a chemical change as a new compound is formed.
Hence, rusting of iron is a chemical change.

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Question 21

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
(a) Do you think rust is different from iron?
(b) Can you change rust back into iron by some simple method.
(c) Do you think formation of rust from iron is a chemical change?
(d) Give two other examples of a similar type of change.

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(a) Do you think rust is different from iron?

(b) Can you change rust back into iron by some simple method?

Q. (1)

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
(a) Do you think rust is different from iron?

(2)

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(b) Can you change rust back into iron by some simple method?

(3)

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(4)

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(d) Give two other examples of a similar type of change.

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.
(b) Formation of manure from leaves is a physical change
(c) Iron pipes coated with zinc do not get rusted easily.
(d) Iron and rust are the same substances.
(e) Condensation of steam is not a chemical change.

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust. (a) Do you think rust is different from iron?

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