Friday 27 July 2018

CBSE Class 9 - Chemistry - Matter in our surroundings - Revision Assignment (#cbsenotes)(#eduvictors)

Matter in our surroundings 

CBSE Class 9 - Chemistry - Matter in our surroundings - Revision Assignment (#cbsenotes)(#eduvictors)

Revision Assignment

Q1. What is the physical nature of matter?

Q2. What are the characteristics of particles of matter?

Q3. Why do the particles mix faster in gases than in solids or liquids?

Q4. Why can you smell an incense stick in the whole room even if it is lit in one place?

Q5. Comment on the properties of matter in tabulated form keeping in mind the rigidity,  compressibility, kinetic energy,  fluidity and density.

Q6. What is the full form of LPG and CNG?

Q7. When a solid melts,  it's temperature remains the same, so where does the heat energy go?

Q8. Define melting point and boiling point of water.

Q9. Convert 373 K,  573K into Celsius scale.

Q10. Define the latent heat of vaporization.

Q11. Define  sublimation.  Name two sublime substances.

Q12. What happens when we start putting pressure and compress a gas enclosed in a cylinder?

Q13. What is Dry Ice?

Q14. Suggest a method to liquefied atmospheric gases.

Q15. What are the differences between boiling and evaporation?

Q16. What are the factors affecting evaporation?

Q17. How does evaporation cause Cooling?

Q18. Why should we wear cotton clothes in summers?

Q19. Why do we see water droplets on the outer surface of a glass containing ice - cold water?

Q20. Why do people sprinkle water on the roof, on a hot summer day?

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