How do you know that rusting of iron is a change?

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Solution

When iron is exposed to air and moisture, a new substance ‘rust’ is formed.

The colour of the iron surface changes due to rust formation.

This colour change of iron is an indicator of 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.

9. How can you say that rusting of iron is an irreversible change ?

Q. How will you distinguish the burning of wood and rusting of the iron bars as the 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?

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

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How do you know that rusting of iron is a change?​

When iron is exposed to air and moisture, a new substance ‘rust’ is formed. The colour of the iron surface changes due to rust formation. This colour change of iron is an indicator of change.

How do you know that rusting of iron is a change?

When iron is exposed to air and moisture, a new substance ‘rust’ is formed.

The colour of the iron surface changes due to rust formation.

This colour change of iron is an indicator of change.