CBSE Class 9 - Chemistry - MATTER IN OUR SURROUNDINGS (Worksheet) (#cbsenotes)

MATTER IN OUR SURROUNDINGS 

Based on  Class 9 - Chemistry NCERT Chapter 

(Worksheet)

Fill in the blanks

① The process of converting solid into liquid is called _________.


② __________ is the process in which the liquid phase changes to gaseous phase at a constant temperature and constant pressure.


③ The amount of a water vapour present in air is called__________.


④ ________ is the reverse process of evaporation.



⑤ Evaporation is a ____ phenomenon while boiling is a bulk phenomenon.


⑥ Conversion of steam into liquid is called __________.


⑦ The process of escaping of molecules from the surface of a liquid at any temperature is called ____________


⑧ The water droplets condensed on cold surfaces is called ____.


⑨ 1 Calorie = ____ joule


⑩ The temperature of a steel rod is 330K. Its temperature °C is ____.


⑪ Rate of evaporation depends on ___________,__________ and __________.


⑫ With increase in pressure, the melting point of ice ___________.


Answers:
1. melting
2. Boiling
3. Humidity;
4. condensation
5. surface;
6. condensation
7. evaporation
8. dew
9. 4.186
10. 57°C
11. Surface Area,Humidity, Temperature
12. decreases