CBSE Pathshala

1. What is matter? What are the physical states of matter? 2. With the help of an activity, show particulate nature of matter. 3. What are characteristics of particles of matter? 4. What is diffusion? Give an example. 5. Write any five characteristics of solids, liquids and gases. 6. Why can we smell hot food from a distance? 7. Why does a solid change into liquid on heating? 8. Define latent heat of fusion. 9. Give reason – A gas fills completely the vessel in which it is kept. 10. Why a wooden table should be called solid? 11. Why more serious burns are caused by steam than water at same temperature? 12. Why can a sponge be compressed though it is a solid? 13. Carry out following conversion (a) 50 deg.Cto Kelvin (b) 200 k to Celsius. 14. Name the conditions to liquefy a gas. 15. Why are clothes spread out for drying? 16. What kind of clothes is most suitable for summers? Why? 17. What is sublimation? Explain with help of an activity and a diagram. 18....

Sadhana Devi Vidyapith, Samastipur  ASSIGNMENT -1, (2012-13)  Sub. – Chemistry, Class   IX  Chapter: Matter in our surrounding NOTE  : Q 1 to 15 carries 2 marks each & Q 16 to 25 carries 3 marks each Q.1 Some substances cannot exist in the gaseous state, other cannot exist in the liquid state, and some cannot exist either in the gaseous or the liquid state. Giving suitable examples. Justify the above statement? Q.2 A student spilled a bottle of ammonia in one corner of the laboratory. Soon the whole laboratory was filled with pungent irritating smell. The students immediately opened the windows and doors and switched on the exhaust fans. After sometime, student got relief. Explain what did actually happen? Q.3 Carbon dioxide which is a gas under normal conditions of temperature and pressure can be liquefied by compressing it to 70 atm at ordinary temperature. What happens when...