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प्रश्न
Give two examples for each of the following cases:
Physical changes are reversible.
उत्तर
(i) Folding of paper
(ii) Melting of ice
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Burning of paper and wood
Fill in the blank.
Heat is .................... by a gas during the process of condensation.
State whether the following is physical or chemical changes.
burning of sugar —
State whether the following is physical or chemical changes.
respiration in living beings —
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Which of the following are physical changes and which are chemical changes ?
Differentiate between a physical change and a chemical change with reference to – Formation of products.
Give three reasons why melting of wax, is considered a physical change while burning of a candle, a chemical change.
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
Give the reason why the following is considered as chemical changes.
A piece of magnesium strip is dropped into a beaker containing dilute hydrochloric acid.
