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प्रश्न
What do you mean by the change of state? Write the flow chart showing the complete cycle of change of state.
उत्तर
CHANGE OF STATE: “The process of change from one state(form) to another state (form) either by absorption or rejection of heat at a constant temperature is called the CHANGE OF STATE.”
COMPLETE CYCLE OF CHANGE OF STATE: On heating solid changes to liquid and liquid on heating changes to vapours. On cooling vapours condense to LIQUID, LIQUIDS on the cooling freeze to SOLIDS. Some SOLIDS on heating change to vapours. On rejection of heat vapours solidify.
This cycle can be shown by the diagram
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संबंधित प्रश्न
Dissolving salt in water is a reversible change.
Is there any change in temperature during the change of phase?
Name the temperature at which :
- a liquid changes into a gas.
- a solid changes into a liquid.
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 |
How does a liquid changes into its gaseous state? Explain
Write whether the following statement is true or false:
Solids have the larger inter-molecular space
Write the properties of this substance.
Water
Why does this happen?
Coconut oil thickens in winter.
Fill in the blanks with the correct words of the statement given below:
During sublimation, a solid on heating turns directly into _________ and on cooling back to __________.
Complete the blank with reference to interconversion of matter on the basis of kinetic theory-with the word ‘increase’, ‘decreases’, ‘gain’, ‘lose’, or ‘overcome’ in following case.
During the melting of solids, the inter-particles space __________.
