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प्रश्न
Write true or false
A natural change can also be a desirable change.
विकल्प
True
False
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उत्तर
True
APPEARS IN
संबंधित प्रश्न
Chemical changes are accompanied by changes in energy.
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Classify the following as a physical or a chemical change.
Burning of paper
What will you take into account while identifying the following?
A physical change in a substance.
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Natural and man-made change.
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
Give a reason why
Change of seasons is a periodic change while the change of weather is a non-periodic 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.
Assertion: Burning of wood log to charcoal is a physical change.
Reason: The products formed of burning a piece of wood can be easily converted back to wood log.
The change of state of a substance from solid to liquid and liquid to gas is ______.
