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प्रश्न
Fill in the blank with the correct word of the statement given below:
Sublimation is _______ a change of state of matter.
उत्तर
Sublimation is considered a change of state of matter.
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संबंधित प्रश्न
What do you mean by the change of state? Write the flow chart showing the complete cycle of change of state.
Mention a change which is always desirable.
Name the temperature at which :
- a liquid changes into a gas.
- a solid changes into a liquid.
What is the name of the process due to which dry ice changes into carbon dioxide gas ?
Fill in the following blank with suitable words :
Gases can be liquefied by applying ....................... and lowering .....................
How is ammonia gas liquefied ?
Define the term 'latent heat of fusion' of a solid. How much is the latent heat of fusion of ice ?
Which of the following process/processes release heat ?
- condensation
- vaporisation
- freezing
- melting
The conversion of a solid into vapours without passing through the liquid state is called :
Match the following:
| Column A | Column B |
| (a) Evaporation of water | (i) Non-periodic change |
| (b) Milk turning sour | (ii) Periodic change |
| (c) Earthquake | (iii) Chemical change |
| (d) Change of seasons | (iv) Physical change |
| (e) Glowing of bulb | (v) Reversible change |
Define the following terms: Diffusion
Differentiate between: Solidification and condensation
Name the phenomenon which causes the following changes:
Conversion of water into steam
Think and try to find a way to demonstrate water cycle in class
Explain the term boiling point
Who am I?
I have no shape whatsoever!
Why does this happen?
Kerosene left open in a dish disappears.
With reference to the liquid state of matter – answer the following
The heat energy supplied to the liquid is absorbed by its molecule & stored as which form of energy.
Prepare a model to demonstrate movement of particles in solids, liquids and gases.
For making this model you will need
- A transparent jar
- A big rubber balloon or piece of stretchable rubber sheet
- A string
- Few chickpeas or black gram or dry green peas.
How to make?
- Put the seeds in the jar.
- Sew the string to the centre of the rubber sheet and put some tape to keep it tied securely.
- Stretch and tie the rubber sheet on the mouth of the jar.
- Your model is ready. Now run your fingers up and down the string by first tugging at it slowly and then rapidly.
