CONVENT OF JESUS AND MARY
CLASS IX
CHEMISTRY WORK SHEET
1. Name the different states of matter.
2. Compare the arrangement of particles in different states of matter.
3. What is the SI unit of temperature?
4. What is evaporation?
5. Clothes dry faster on a sunny day. Give reason.
6. Why do water droplets appear on a cold surface?
7. What is humidity?
8. Give the boiling point and freezing point of water in degree Celsius.
9. What is condensation?
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Answers
1. solid,gas,liquid are different states of matter
2. solid:In solid state atoms or molecules are arranged very closely without any space
liquid:In liquid state atoms or molecules are arranged less closely with leaving less between atoms or molecules compared to solid state
gas:In gaseous state atoms or molecules are arranged very widely without leaving any space
3. SI unit of temperature is kelvin
4. by heating the water it gets boiled and change to liquid state by over heating the liquid state of water it changes to water vapour because of less density of vapour it travels to upside this process called evaporation
5. Clothes dry faster on a sunny day because on sunny day temperature is too high so water in clothes gets heated water in it evaporated then clothes get dry faster on sunny day compared to cloudy day
6. because of condensation process
explanation:Water droplets form on the outer surface of the container containing a cold substance due to Condensation. The temperature of the container is cold enough to cool down the water vapor in the surrounding air, so it turns from gaseous to liquid state. ... Condensation will occur more easily in saturated air than dry air.
7. humidity mean water concentration present in atmosphere
8. freezing point is 0 degree celsius
boiling point is 100 degree celsius
9. the conversion of vapour or gas to liquid is called condensation
Answer:
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