6 Explin why mercury in a glass capillar has a meniscus that is convex and goes

Question

6 Explin why mercury in a glass capillar has a meniscus that is convex and goes down the wall. 7.-Identify the difference phases, the equilibrium between phases and the degree of freedoms in each of them for the following graph. Explain why Carbon dioxide sublime:s Carbon dioxide phase diagram 140 120 100 80 60 40 20 Super critical fluid Critical point 30.98°C 72.79 atm Triple point 56.57°C, 5.11 atm 20 40 - 78C Temperature (C) 8-Explain the distilillation of a mixture of 2 similar alcohols compounds Apply the Gibbs rule for phases to determine the degrees offreedom into the loop and in the curves for the different phases. boiling point boiling point BPt of pure A vapour compositon liquid m position Bpt of pure B O A 1.0 B C11.0 A 0 B C3 C2 mole fractions

Explanation / Answer

Ans 6 :

The convex meniscus of mercury in the glass capillary can be explained using adhesion and cohesion.

The adhesion is the attraction beiween dissimilar substances and cohesion is the attraction between similar/like/same substances.

So here in the case of mercury the cohesive forces (between the mercury particles) are stronger than the adhesive forces (between the mercury and glass). So the mercury goes down the wall , towards its own molecules , and the meniscus becomes convex , bulging outwards.

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