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CHEMISTRY [2 Mark Question Answer]

Matter · ICSE STD 8 (ICSE - English Medium). 8 questions.

Questions

[2 Mark Question Answer]

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8 questions · timed · auto-graded

Question 12 Marks
Particles of matter move more rapidly on application of heat.
Answer
Application of force increases the $\text{K.E.}$ of particles and space increases and inter-particle attraction decreases. Thus particles move rapidly.
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Question 22 Marks
On heating a sublimable solid, the molecules break free $\&$ escape from surface of the solid directly into vapour.
Answer
On heating a sublimable solid the inter$-$particle attraction is overcome and the molecules break$-$free and escapes from the surface of the solid directly into the vapour.
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Question 32 Marks
Kinetic energy of molecules of gases is very large & of solids, the least.
Answer
The Kinetic Energy of molecules of gases is very large because :
$(i)$ The inter$-$particle space between the particles is maximum.
$(ii)$ The Inter$-$particle attraction between the particles is negligible.
Whereas The kinetic energy of molecules of solids is least because :
$(i)$ The Inter$-$particle space between the particles is maximum.
$(ii)$ The Inter$-$particle attraction between the particles is very strong.
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Question 42 Marks
Solids’ cannot be compressed, but gases are highly compressible.
Answer
In solids : Particles are closely packed. Inter-particle space is minimum and hence cannot be compressed.
In gases : Particles are least compact and inter$-$particle spaces are maximum. Hence are highly compressible.
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Question 52 Marks
Particles of matter possess energy called kinetic energy
Answer
Particles of matter are contiunously moving, that is, they possesses kinetic energy.
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Question 62 Marks
On the basis of kinetic theory explain why, ammonium chloride sublims and goes from solid state directly into vapour state.
Answer
Ammonium Chloride sublimes and goes from solid state directly into vapour state because if low inter$-$particle attraction. Sublimable solids have very low force of attraction between their particles.
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Question 72 Marks
Inter$-$particle attraction between atoms of gases is very weak'. State five properties of gases which correlate as a consequence of the weak inter$-$particle attraction between particles of gases.
Answer
Gases are $–$
$(i)$ least rigid
$(ii)$ highly compressible
Inter$-$Particles attraction between atoms of gases is very weak. The five properties of gases which correlate as a consequence of the weak inter-particle attraction between particles of gases are :
They have no definite volume.
They have no definite shape.
They have no free surface.
Gases Rapidly diffuse with other gas particles
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Question 82 Marks
Differentiate between the two characteristics of matter $– 4$ mass’ ‘weight’.
Answer
Mass :
$1.$ The amount of matter in a body.
$2.$ It is measured in Kilograms $(kg).$
Weight :
$1.$ Due to the pull of gravity on a body.
$2.$ It is measured in Newtons $(N)$
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[2 Mark Question Answer] - CHEMISTRY STD 8 Questions - Vidyadip