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Crystal Structures
Answer the following questions.
Assume that the lattice consists of only one type of atom, and the radius of this atom is r.
1. Assume an atom is a perfect sphere. In terms of r, what volume of the simple cubic unit cell is occupied by atoms?
2. What is the total volume of the simple cubic unit cell?
3. Determine the packing efficiency of a simple cubic unit cell. Use your answers from the previous two questions.
4. Determine the packing efficiency for a body-centered cubic unit cell.
5. Determine the packing efficiency for a face-centered cubic unit cell.
6. Observe the difference in stacking patterns of the unit cells and note how they are related to the packing efficiency.
Explain what is the pH of the solution when 18.30 mL of 0.137 M trisodium hemimellitalate (trisodium benzene 1,2,3, tricarobxylate) is mixed with 25.00mL of 0.274 M HNO3 (to two d.p.)
Rose Bengal is a chromophore used in biological staining that has an absorption maximum at 559.1 nm and several other shorter wavelength absorption bands in the ultraviolet and visible regions of the spectrum when dissolved in ethanol. What is the..
Beta sheets are a type of secondary structure in proteins. A segment of a single chain in an antiparallel. sheet has a length of 291 Å . How many residues are in this segment
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How would you find the Ksp of a salt using only molecular weight and solubility?
If the isotope with the least mass didn't exist (and the others did), what would that do to the atomic mass for the element?
The two rings are heated to 66.1 C and dropped into a 15.0 mL of water at 20.5 C. When equilibrium is reached, the temperature of the water is 22.5 C. What is the mass of gold ring. (Assume a density of 0.998 g/mL for water.)
If a drop of water clings to the outside of the foil cap and is not removed, how would the experimentally determined molecular weight be affected? Too high or too low?
The two isotopes of Uranium, 238U and 235U, can be separated by effusion of the corresponding UF6 gases. What is the ratio (in the form of a decimal) of the root-mean-square speed of 238U6 to that of 235U6 at constant temperature
The rate constant for a certain reaction is k = 2.60×10-3 s-1 . If the initial reactant concentration was 0.200M , what will the concentration be after 14.0 minutes?
What volume (in mL) of 12 M HCI solution is required to prepare exactly 500. mL of a 0.45 M HCI solution
The diatomic molecule OH exists in the gas phase. The length and bond energy have been measured to be 97.06pm and 424.7 kJ/mol, respectively.
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