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प्रश्न
Is burning a physical change or a chemical change? Why?
उत्तर
Burning is a chemical change as new substance is formed with new properties and it cannot be reversed.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Rusting of almirah
Write true or false for the statement.
Dissolving of solute in a solvent and rusting of iron are both physical changes.
A physical change is temporary. Explain.
Classify the following as physical or chemical change :
Growth of a plant
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
State which of the following pertain to – chemical changes.
(a) Substance retains its identity
(b) The change is permanent
(c) No new substance is formed
(d) Is easily reversible
(e) Produces one or more new substances by a change in its composition
(f) The change is temporary
(g) The composition and properties of the original substance are not altered.
State which of the following terms connected with change of state of matter i.e.
(a) Melting
(b) Vaporisation
(c) Condensation
(d) Freezing
pertain to –
- Conversion of a liquid into a vapour or gas.
- Conversion of a liquid into a solid.
- Conversion of a solid into a liquid on heating.
Select the chemical changes from the following list of changes
Breaking of glass
In a solution of salt in water, water is the solute
When a woolen yarn is knitted to get a sweater, the change can be classified as ____________.
