Advertisements
Advertisements
प्रश्न
Give the reason why the following is considered as chemical changes.
An iron nail kept open in the atmosphere rusts.
Advertisements
उत्तर
Rust of iron is a chemical change as iron rust [Fe2O3χ H20] is a brown flaky powder having a different composition from original iron metal, which is an irreversible change.
APPEARS IN
संबंधित प्रश्न
Classify the following as chemical or physical change:
Boiling of water to form steam.
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Cutting a log of wood into pieces is a chemical change.
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
Fill in the blank.
Heat is .................... by a gas during the process of condensation.
Write short answer.
Name two reversible changes.
Is burning a physical change or a chemical change? Why?
Fill in the blank
Chemical change occurs as a result of __________ between two substances.
Fill in the blank.
Growing of a seedling into a plant is _______ change.
Give reasons why – separation of mixtures e.g. iron from a mixture of iron and sulphur is a physical change, but heating a mixture of iron and sulphur is considered a chemical change.
Assertion: Burning of wood log to charcoal is a physical change.
Reason: The products formed of burning a piece of wood can be easily converted back to wood log.
