Chemistry - 9 Chapter - 6
State of Matter
Test - 9

1. The molecules of ice have:



2. How heating in liquid will affect its evaporation:




3. 0^C temperature of water is called:




4. Cooling the vapors of some compounds change them directly into solid state. This phenomenon is called:



5. The free movement of molecules in liquid makes them:




6. It is easy to compress air as compared to water. Why?
There are large empty spaces between molecules of air, when pressure is applied the size of these spaces is reduced and air is compressed. In water molecules are already very close and ----------- compressed further.


7. How does a liquid evaporate?.............
Liquid molecules keep on moving freely. Some molecules when come to the surface of earth they overcome ionic force and escape into atmosphere. This happens at --------------------.


8. What is the condition of the particles of a solid at its melting point?
The kinetic energy and movement of particles of solids increase with the increase in temperature. Near boiling point the energy and movement of particles is at its peak which overcomes the ---------- forces and solid melts.


9. What is the condition of the particles of a solid at its melting point? ......................... The kinetic energy and movement of particles of solids increase with the increase in temperature. Near boiling point the energy and movement of particles is at its peak which overcomes the ----------- forces and solid melts.


10. Boiling and evaporation occurs at a specific temperature for each liquid.


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