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CBSE Notes 2011-2012

IX

Climate

Climate:
 
Climate refers to the sum total of weather conditions and variations over a large
area for a long period of time (more than thirty years).
 
Weather:
 
Weather refers to the state of the atmosphere over an area at any point of time.

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PRACTISE QUESTIONS On MOLE CONCEPT By JSUNIL

1. Determine the mass of 6.022 X 1023 number of N2 molecules.
2. Calculate the number of particles in-
(i) 8 g of O2 molecules (ii) 2.5 mol of calcium atoms.
3. What is the mass of 2.5 mol of Methane?
4. Find the mass of one molecule of water.
5. Calculate the number of water molecules and number of oxygen and hydrogen atoms in a drop of water containing 0.03 mol of water.

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