What do you to change a substance from gas state to liquid state ?
A) By giving heat
B) By cooling
C) By increasing pressure
D) By decreasing pressure
A) A or C
B) B or C
C) A or D
D) B or D
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……………. defined an element as any substance that cannot be decomposed into further simple substance by physical or chemical change.
B) Robert Boyle
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Compare change of state from solid to liquid and from liquid to vapour.
Solid to liquid Liquid to vapour i. The change of state from solid to liquid is called melting and from liquid to solid is called solidification. The change of state from liquid to vapour is called...
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The phase change from liquid to gas that occurs at the surface of liquid at any temperature is called..........
D) evaporation
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The heat energy required to change 1gm of liquid to gas at constant temperature is called …………………..
B) latent heat of vapourization
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The heat energy required to change 1gm of liquid to gas at constant temperature is called …………………..
2 Answers
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The latent heat of vapourization of liquid of “m”gm when the heat energy of “Q” calories is supplied to change its state from liquid to gas is ………………
Q = mL so, L = Q/m. Hence, the correct option is (B) Q/m
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The latent heat of vapourization of liquid of “m”gm when the heat energy of “Q” calories is supplied to change its state from liquid to gas is ………………
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The latent heat of fusion of a solid ‘ substance of mass “m” is L. The required amount of heat to change solid phase to liquid phase is ……………… cal.
Correct option is A) Q = mL
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Sublimation of Iodine is a (a) Chemical change (b) Physical change (c) Natural change (d) Undesirable change
(b) physical change
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The molar specific heat of a gas is defined as `C=(Dq)/(ndT)` Where `dQ`=heat absorbed `n` = mole number `dT` = change in temperature The equation of
Correct Answer - B `C=(R)/(gamma-1)+p(dV)/(dT)` `=(R)/(gamma-1)+alphaV.(R)/(2alphaV)=(R)/(gamma-1)+(R)/(2)=(R(gamma+1))/(2(gamma-1))` `Q=-DeltaU=DeltaU+W , or W=-2DeltaU` `C=(R)/(gamma-1)+((-2RdT)/((gamma-1)dT))=(R)/(1-gamma)` `pdV=(-2RdT)/(gamma-1)` `(RT)/(V)dV=(-2)/(gamma-1)RdT(dT)/(T)=-((gamma-1))/(2)(dV)/(V)` log `T=-((gamma-1))/(2)logV =logV^(-(gamma-1)/(2))+logK` or log `TV^((gamma-1)/(2))=` constant
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