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प्रश्न
State which of the following pertain to – chemical changes.
- Substance retains its identity.
- The change is permanent.
- No new substance is formed.
- Is easily reversible.
- Produces one or more new substances by a change in its composition.
- The change is temporary.
- The composition and properties of the original substance are not altered.
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उत्तर
The following points pertain to chemical changes:
b. The change is permanent.
e. Produces one or more new substances by change in its composition.
The remaining points pertain to physical changes.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Burning of paper and wood
Changes in which only ______ properties of a substance change are called physical changes.
Write true or false for the statement.
Deforestation is a man-made change
Write short answer.
Name two reversible changes.
Write true or false
A natural change can also be a desirable change.
Differentiate between a physical change and a chemical change with reference to – Nature of change is temporary and reversible or permanent and irreversible.
State the observations seen, when milk in a dish is kept aside for a few hours or more. Is the change which occurs – a physical change or a chemical change. Give reasons.
Name the following.
The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.
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?
The change of state of a substance from solid to liquid and liquid to gas is ______.
