Control of colloid chemistry, option 1

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Uploaded: 20.09.2012
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Question №1

Subject of colloid chemistry. What matters it studies?

Question №24

Adsorption and its driving forces. The explanation in terms of intermolecular forces.

Question №46

Molecular-kinetic phenomena and their manifestation in colloidal systems.

Question №78

Air dispersion methods for dispersed systems. Job dispersion and the degree of dispersion.

Question №102

As emulsions are classified according to the concentration of the dispersed phase. How is the concentration of the dispersed phase of the emulsion?

Task №1

Angle grape juice stainless steel is 50 °, and polyethylene 100 °. How many times is the work of adhesion equilibrium juice to become more than a polyethylene?

Task №101

The results of measurements of surface tension of solutions of n-butyl alcohol in water at 12,0 ° C, depending on the concentration (table below, the concentration of C in mmol / L, the surface tension in mN / m) to find the limit adsorption alcohol graphic method, and calculate the area occupied by one molecule of alcohol in a saturated adsorption layer on the assumption of monomolecular adsorption.

With 0 3.2 4.8 6.4 8.5 13.0 16.9 26.0 33.8 51.0 67.5 102 135 203

74.2 73.0 73.1 72.0 71.3 71.3 70.1 68.0 65.8 63.1 60.7 56.9 53.8 48.9

Task №201

The whole cow milk fat volume average droplet diameter ranges from 2.9 to 4.4 microns depending on individual circumstances. Other characteristics are more constant at 20 ° C, the density of fat 0.920 g / cm3, the density of the dispersion medium (skimmed milk) 1.034 g / cm3, viscosity 1.60 mPa?s.

Assume, whole milk fat droplet diameter is 4 mm at 20 ° C in a rectangular cardboard "package" height of 15 cm. The initial drop time uniformly distributed in height. How much time will emerge on the surface of the milk fat 50%, if all the drops have the same diameter? (Note that in these conditions, the ascent of 50% of fat is equal to ascent time with a drop of half the height of the package).

Task №301

The molar mass of the sample on nitrocellulose following data depending on the osmotic pressure of a solution thereof in methanol by concentration at 20 ° C:

c, g / l 0.55 1.25 2.28 6.65 12.1

Pa 13.1 32.0 62.1 237 612

Task №401

Orange juice is a sol containing very small generally spherical particles having a zeta potential of 50 mV and having a low ionic strength. Determine the electrophoretic mobility and electrophoretic velocity of the particles when the juice is between flat electrodes with a potential difference of 120 V and a distance between them of 40 cm. The dispersion medium viscosity juice acknowledge mPa?s 4.5 and a relative dielectric constant of 54.1.

Task №501

Determine coefficients for MarkaHauvinka amylose acetate in a mixed solvent of 43 vol.% Nitromethane + 57 vol.% N-propanol by the following data on the dependence of intrinsic viscosity on the molar mass at 25 ° C:

M ? 106 g / mol 3.11 2.17 1.68 1.34 0.869 0.676 0.569 0.376 0.148

[], Ml / g 168 135 121 110 86 77 69 56 35

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