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प्रश्न
State whether the following is physical or chemical changes.
Melting of wax —
उत्तर
physical change.
APPEARS IN
संबंधित प्रश्न
What do you observe when :
solid ammonium chloride is heated
True or false?
During a physical change energy is either given out or absorbed by the system.
What role does energy play in initiating a chemical change ?
Distinguish between the following.
Natural change and man-made change
Under which different types can the following changes be classified?
Revolution of the earth around the sun.
Give reason.
While purchasing canned food, its expiry date should be checked.
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 _________.
Fill in the blank with the correct word of the statement given below:
Ammonium chloride, a sublimable solid undergoes _________ on heating.
Paper, LPG, CNG petrol, etc, are ______ substances.
What is the change?
