Advertisements
Advertisements
प्रश्न
Given reason:
Burning of paper is a chemical change.
Advertisements
उत्तर
When a piece of paper is burnt a new substance ash is produced. Even when the burning is stopped, the ash cannot be changed back into paper. This shows that the formation of the ash from paper is a permanent and irreversible change.
APPEARS IN
संबंधित प्रश्न
What do you observe when :
lighted match stick is brought near the mouth of the test tube containing hydrogen gas.
Write true or false
Cutting of paper into pieces is a chemical change.
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
Classify the following as a physical or a chemical change.
Manufacture of salt from sea water
Differentiate between a physical change and a chemical change with reference to – Formation of products.
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
A change in which matter undergoes a change but the total mass of the substance is unaltered is a ______ change.
______ is the substance that is dissolved in a solvent.
Gas exists in three states as solid, liquid, and gas.
Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
