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प्रश्न
Which of the following are physical changes and which are chemical changes ?
विकल्प
Physical change
Chemical change
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उत्तर
Burning of magnesium wire – Chemical change
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संबंधित प्रश्न
Explain why burning of wood and cutting it into small piece are considered as two different types of changes.
Classify the following changes as physical or chemical:-boiling
Tick the most appropriate answer.
Physical changes are
Given reason:
Burning of paper is a chemical change.
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Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
Ammonium chloride is also a sublimable solid. Give a reason why the sublimation of ammonium chloride involves a physical and a chemical change.
Give reasons why – separation of mixtures e.g. iron from a mixture of iron and sulphur is a physical change, but heating a mixture of iron and sulphur is considered a chemical change.
Cutting a log of wood into pieces is a chemical change.
