Revision on unit 1 (Matter and its construction) | Baamboozle - Baamboozle

English 20 Public

Matter properties , density , matter structure, the atom

Study Slideshow

Density is the………… of unit volume of the substance, and its measuring unit is …………..

mass, gm/ cm3

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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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Mention the kind of each matter of the following figures (element or compound) giving the reason .(H2 , H2O, O2 , HCl , Cl2) ,

H2 element because, its molcule consists of similat atoms , H2O compound because , it consists of different atoms , O2 is element , HCl is compound ,

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Balloons of festivals filled with helium rise upwards due to the …. ........

density of helium is less than density of air.

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It is very hard to fragment a piece of iron with your fingers. why?

Because , iron is a solid which has very strong inter molecular forces and tiny inter molecular spaces

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In an experiment for determining density of a piece of iron, following results were recorded: mass of the piece of iron = 78 gm., The volume of water in cylinder = 90 cm3., volume of water and piece of iron = 100 ,Density of Fe=.......

Volume of iron = 100 - 90 =10 and density of iron = Mass / volume = 78 /10 =7.8 gm/cm3

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. A piece of metal its mass is 25gm and its volume is 10cm3, when it is placed in Water it will............ (Water density 1 gm/cm3)

It will sink (Density of metal = mass /volume = 25 /10 = 2.5 larger than water.)

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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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When atomic number of an element equals its mass number , this means that there aren't ……in the nucleus of this element.

neutrons ( 1 H 1) ,its mass number = atomic number = 1).

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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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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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It is the simplest pure form of matter which can’t be analyzed chemically into simpler form by simple chemical method

Element

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.The smallest individual unit of matter which shares in chemical reactions.

The atom

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Write down the electronic configuration of Al 13 :

K=2 , L =8 , M= 3

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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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