Representative properties of small-pore silica gel are: dp=24 oA ,  ϵp=0.47,  ρp=1.09 g/cm3 , and Sg=800 m2 /g. (a) Are these values reasonably consistent? (b) If the adsorption capacity for water vapor at 25oC and 6 mmHg partial pressure is 18% by weight, what fraction of a monolayer is adsorbed?

What is the BET equation used for? Does it assume physical or chemical adsorption? Does it assume monomolecular- or multimolecular-layer adsorption?

Cakulate the atomic packing fraction for the hexagonal close-packed crystal struc- ture for which e-(a. Remember that the base of the unit cell is a parallelogram.

19. The potential oxygen content of the stack gas is always determined by the total amount of combustibles present. true or false

1.1) Distinguish between a fluctuating dipole and a pemanent dipole. ANSWER TO QUESTION 1.1 1.2) State with reason, the type of bonding that occurs in common salt, NaCl. ANSWER TO QUESTION 1.2

Analyze the crystallization capacity between the following polymeric pairs:a) Straight-chain polyethylene and branched-chain polyethyleneb) Isotactic polypropylene and atactic polypropylenec) Isotactic polypropylene and propylene-ethylene copolymer

The three lines below represent grain boundary, surface and self -diffusion in an unspecified metal. Match each line with the type of diffusion. This can be done by comparing the activation energy. Activation energy for surface diffusion is expected to have the lowest activation energy whereas volume diffusion the greatest.

1. Calculate the specific surface area of an activated sample. Given at 273K and 760 mmHg, 1gram of the activated carbon can adsorb a maximum amount of 0,005 mol N₂. Assume that the occupied area adsorbed by an N₂ molecule is 16,2 Ų.

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Which of the following statements relating to the sintering of ceramics are false? 1. The driving force for sintering is the reduction of internal interface energy. 2. The source of mass transport at coarsening stage is mainly surface. 3. Sintering involves heating the ceramic to above its melting point. 4. The larger the particle size, the higher the sintering rate would be. 5. Lower temperatures promote diffusion of atoms and mass transport. 2, 4 and 5 1, 2 and 3 O O 1, 3 and 4 1, 2 and 5 3, 4 and 5