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CH-1 MATTER IN OUR SURROUNDINGS
1.) What happens when you open a bottle of perfume ?
2. Name the state of matter in which :
(1) layers of particles can slip and slide over one another easily.
(ii) Particles just move around randomly because of very weak for
3. CO2 is a gas. Write its two gaseous properties to justify it.
4. How can we liquefy a gas?
5. Solid CO2 is also known as dry ice. Why? 6
. Write the full form of: (i) CNG (ii) LPG
Explain the following:
Gases exert pressure on the walls of the container
fii) Water is liquid at room temperature.
Evaporation causes cooling.
Account for the following:
When sugar crystals dissolve in water, the level of water does no
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1diffusion
2liquid and gas
3It can float around freely. It is highly compressible
4by reducing the temperature and liquefying it
5because it quickly sublimates to gas at room temperature and looks like ice
6compressed natural gas and liquefied petroleum gas
7gases exert pressure on the walls as they are not allowed to float around and are instead being compressed
8waters melting point is 0c and is boiling point is100c. As room temp is between these temp, water stays liquid.
9no, because there are a lot of intermolecular space between particles
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