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प्रश्न
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think rust is different from iron?
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उत्तर
Yes, rust is different from iron. It is a brown powder of iron oxide.
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संबंधित प्रश्न
Explain the following giving an example.
Pure substance
Tick the most appropriate answer
2. Melting of ice is a
- reversible change
- irreversible change
- chemical change
- none of these
Fill in the blank.
An earthquake is a .................. change.
State three differences between evaporation and boiling
What do you observe when :
lighted match stick is brought near the mouth of the test tube containing hydrogen gas.
True or false
Change of seasons is a non-periodic change.
Classify the following as a physical or a chemical change.
Drying of wet clothes
Classify the Following as a Physical Or a Chemical Change.
Making of a Sugar Solution
State which of the following pertain to – chemical changes.
- Substance retains its identity.
- The change is permanent.
- No new substance is formed.
- Is easily reversible.
- Produces one or more new substances by a change in its composition.
- The change is temporary.
- The composition and properties of the original substance are not altered.
Give the reason why the following is considered as chemical changes.
Sulphur when burnt in air evolves a gaseous acidic product.
