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प्रश्न
What do you observe when :
solid ammonium chloride is heated
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उत्तर
Solid ammonium chloride on heating changes into vapours (change of state) is physical change.
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संबंधित प्रश्न
What do you observe when :
a piece of paper is burnt
State whether the following is physical or chemical changes.
Boiling of an egg —
Tick (√) the correct alternative from the choice given for the following statement
Burning is a
Melting of solid (wax) is a physical change.
Chemical changes are accompanied by changes in energy.
Distinguish between the following.
Natural change and man-made change
Under which different types can the following changes be classified?
Bursting of a cracker.
Explain in brief the involvement of energy in physical and chemical changes.
Fill in the blanks with the appropriate words of the statement given below:
Chemical changes may involve exchange of energy in the form of __________ and _________.
Cut vegetables turn brown when exposed to air, this is due to ______.
