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प्रश्न
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.
उत्तर
Chemical change :
(b) The change is permanent.
(e) Produces one or more new substances by a change in its composition.
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संबंधित प्रश्न
What role does energy play in initiating a chemical change ?
Classify the following changes as physical or chemical:-boiling
Fill in the blank
Revolution of the earth around the sun is a ________ change.
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
Which of the following are physical changes and which are chemical changes ?
Rusting of iron
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
Classify the Following as a Physical Or a Chemical Change.
Formation of Clouds
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.
Stretching gold coin into a ring is a ______ change.
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?
