Chem: Water and Common Salt
chem FATHER AGNEL SCHOOL CLASS IX SUB : CHEMISTRY Matter In Our Sorroundings
1. Define matter. 2. What are the characteristics of matter? 3. What do you mean by the following terms: a. Evaporation b. Sublimation c. Condensation d. Latent Heat of Fusion e. Latent Heat of vaporisation. f. . Melting point g. Boiling point
4. Why do gases diffuse rapidly? 5. Write the relationship between Celsius scale and Kelvin scale of temperature. 6. Why does the level of water not change when salt is dissolved in water? 7. How can matter change its state? 8. Define boiling. Why boiling is considered as bulk phenomenon? 9. Why does the temperature of a substance remain constant during melting and boiling even when heat is being supplied to it continuously? 10. What is evaporation? Why does evaporation cause cooling? 11. What are the differences between boiling and evaporation? 12. What factors affect the rate of evaporation? 13. After rains when do rain drops dry away easily - on a cloudy day or on a sunny day? State reason. 14. Why solids cannot be compressed like gases? 15. Draw a cyclic figure to show interconversion of states and explain fusion, vapourisation, condensation, solidification and sublimation. 16. Tabulate the difference in the three states of matter with respect to: a) Intermolecular space b) Intermolecular force of attraction c) Compressibility d) Fluidity e) Shape f) Kinetic energy g) Rigidity 17. Why does steam cause more sever burns than boiling water, though both are at same temperature? 18. What is a dry ice and how is it prepared? 19. Describe an activity to show a change of state directly from solid to gaseous state taking the example of ammonium chloride. 20. Alka was making tea in a kettle .Suddenly she felt intense heat from the puff of steam gushing
1. Define matter. 2. What are the characteristics of matter? 3. What do you mean by the following terms: a. Evaporation b. Sublimation c. Condensation d. Latent Heat of Fusion e. Latent Heat of vaporisation. f. . Melting point g. Boiling point
4. Why do gases diffuse rapidly? 5. Write the relationship between Celsius scale and Kelvin scale of temperature. 6. Why does the level of water not change when salt is dissolved in water? 7. How can matter change its state? 8. Define boiling. Why boiling is considered as bulk phenomenon? 9. Why does the temperature of a substance remain constant during melting and boiling even when heat is being supplied to it continuously? 10. What is evaporation? Why does evaporation cause cooling? 11. What are the differences between boiling and evaporation? 12. What factors affect the rate of evaporation? 13. After rains when do rain drops dry away easily - on a cloudy day or on a sunny day? State reason. 14. Why solids cannot be compressed like gases? 15. Draw a cyclic figure to show interconversion of states and explain fusion, vapourisation, condensation, solidification and sublimation. 16. Tabulate the difference in the three states of matter with respect to: a) Intermolecular space b) Intermolecular force of attraction c) Compressibility d) Fluidity e) Shape f) Kinetic energy g) Rigidity 17. Why does steam cause more sever burns than boiling water, though both are at same temperature? 18. What is a dry ice and how is it prepared? 19. Describe an activity to show a change of state directly from solid to gaseous state taking the example of ammonium chloride. 20. Alka was making tea in a kettle .Suddenly she felt intense heat from the puff of steam gushing