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प्रश्न
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
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उत्तर
It is the conversion of a solid – directly into gaseous (vapour) state and on cooling directly back to solid-state – without changing into a liquid state.
It involves a change of state-and hence it is a physical change.
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संबंधित प्रश्न
Classify the changes involved in the following process as physical or chemical changes:
Photosynthesis
Fill in the blank
change in which the substance can be brought back to its original state is called a ............... change.
How do you say that the process of digestion is a chemical change ?
Name two reversible changes.
What is a chemical change ? Give two examples of chemical changes.
Fill in the blank with the appropriate word of the statement given below:
Germination of seeds is considered a __________ change.
Select the chemical changes from the following list of changes
Vaporisation of water into water vapour.
Select the chemical changes from the following list of changes
The carbon cycle.
Select the chemical changes from the following list of changes
Breaking of glass
Which of the following is a physical change?
