Chemistry - 9 Chapter - 6
State of Matter
Test - 5


1. What is evaporation?


2. Why liquids do not have any specific shape?..................... Particles of solids are so strongly held that they can only vibrate with out changing position. In liquids the cohesive forces are not so strong and particles can move and change position due to which liquids do not have ------ shape


3. Minimum cohesive forces exist between the particles of _____.



4. Molecules of gases move very fast in all possible directions.


5. Why gas neither has a fixed mass nor volume?


6. Why gases exert pressure on walls of the container?


7. What is meant by elastic collision? .................... When gas molecules collide with each other their total energy does not increase or increase. This type of collision is called -------- collision.


8. Kinetic energy of _____ molecules is the highest.



9. Distance between the molecules of a _____ is the largest.



10. Distance between the molecules of a solid is the largest.


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