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5
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.No. of protons = ……. , Number of electrons =....,number of neutrons=................for Cl 17 ( (mass number = 35)
Mass number = P + n (17 protons , 17 electrons , 18 neutrons)
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baam
Lose 25 points!
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gift
Win 20 points!
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rocket
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thief
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5
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All the following elements are active elements except…… . why? ( 6 C , 1 H , 7N , 18 Ar)
18 Ar , because , (2,8, 8) so its outer energy level is completely filled with 8 electrons and stable or inactive.
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5
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The volume of a mixture of water (200 cm3) with alcohol (300 cm3) equals ..........................because,........
450 ( less than 500 , because, the alcohol molecules inter or spread in the spaces between water molecules.
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5
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Density is the………… of unit volume of the substance, and its measuring unit is …………..
mass, gm/ cm3
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5
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Write down the electronic configuration: Ca 20
K = 2 , L = 8 , M = 8 , N= 2
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thief
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star
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fairy
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25
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baam
Lose 25 points!
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5
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Density is the………… of unit volume of the substance, and its measuring unit is …………..
Mass , gm/cm3
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5
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Electrician uses a screw driver made up of steel iron with a woody handle . why?
Because, steel iron is a good conductor of electricity while the wood is a bad conductor of it.
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5
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The motion in molecules is limited in …..……and the inter molecular forces are very weak in .............
limited in iron (solid )and very weak in oxygen (gas)
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banana
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magnet
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rocket
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baam
Lose 15 points!
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5
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.The smallest individual unit of matter which shares in chemical reactions.
The atom
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5
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Write down the electronic configuration of Al 13 :
K=2 , L =8 , M= 3
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seesaw
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star
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shark
Other team loses 15 points!
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lifesaver
Give 10 points!
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5
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Equal volumes of different material have different masses . why?
because, they have different densities. ( D = M / V )
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The intermolecular forces are very strong in………. .(H2O , H2 , O2 , Fe)
Fe ( it is a solid)
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