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Standard VI
Chemistry
Anamolous Expansion of Water
Determine the...
Question


Determine the incorrect statements using the given phase diagram of water.

482616.png

A
The triple point is point A. This is the point at which all three phases are in equilibrium with one another
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B
The line AB is the line representing the solid-liquid equilibrium line. Anywhere along this line the substance could melt or freeze
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C
The slope of line AB is negative. This slope indicates that the solid is much denser than the liquid
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D
Line AD represents the phase changes of sublimation and deposition
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E
Line AC represents where the substance would condense and vaporize
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Solution

The correct option is D The slope of line AB is negative. This slope indicates that the solid is much denser than the liquid
The option (C) represents the incorrect statements using the given phase diagram of water.
The slope of line AB is positive. This slope indicates that the solid is much denser than the liquid.

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Q.

The phase diagram for a pure substance is shown above. Use this diagram and your knowledge about changes of phase to answer the following questions.

If the triple point pressure of a substance is greater than 1atm, we expect:

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Q. For many substances, there exists a temperature Ttr. and a pressure ptr at which all the three phases of a substance (gaseous, liquid, and solid) are in equilibrium. These temperature and pressure are known as the triple point. For example,Ttr=0.0075∘C and ptr=4.58mm Hg for water. The latent heat of vaporization of water at the triple point is q=2.48×103kJ/kg, and the latent heat of fusion of ice is λ=0.34×103kJ/kg.
Find the latent heat v of sublimation (i.e. a direct transition from the solid to the gaseous state) of water at the triple point.
Q. The pressure on a sample of water at its triple point is reduced while the temperature is held constant. Which phases changes are favoured?
(I) melting of ice
(II) sublimation of ice
(III) vaporization of liquid water.

Q. The first vertical line in the diagram represents a thermometer with the melting points for ice and dry ice (melting point of ice is greater than that of dry ice) at normal atmospheric pressure. The numbered vertical lines represent possible melting points of both the substances at 10 atmospheric pressure. Which vertical line best represents the melting points of both the substances at 10 atmospheric pressure relative to the respective values at normal atmospheric pressure?
Note : The difference in temperatures are not to the scale.
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Q.

The diagram below shows the change of phases of a substance on a temperature-time graph on heating the substances at a constant rate.

(a) What do the parts AB, BC, CD and DE represent?

(b) What is the melting point of the substance?

(c) What is the boiling point of the substance?


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