Homework Answers
7.
a. The ideal chemical formula for the hydroxyapatite (HA) is Ca5 (PO4) OH
and the crystal structure for hydroxyapatite is hexagonal.
b. There are ten atoms in the unit cell of HA.
c. Unit cell parameters for the undoped HA and 100% Sr - doped HA crystal are -
a = b = 9.494 angstrom and c = 6.887 angstrom
And, a = b = 9.842 angstrom and c = 7.321 angstrom
d.
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U n e all the bones in your skeletal system. a.) What is the ideal chemical...
NaCl has a rock salt crystal structure with a unit cell edge length of 0.56 nm....
NaCl has a rock salt crystal structure with a unit cell edge length of 0.56 nm. The atomic weights of the Na and Cl are 23 and 35.5 g/mol, respectively, and the Avogadro's number is 6.022 x 10“ formula units/mol. (a) Draw a unit cell to show the crystal structure of the NaCl. (b) What is the coordination number of the atoms in this structure? (c) How many Na atoms and Cl atoms in one unit-cell of such a structure?...
16. Calculate the number of atoms per unit cell, coordination number, and atomic packing factor for...
16. Calculate the number of atoms per unit cell, coordination number, and atomic packing factor for an HCP cell. 17. Assuming ideal spherical atoms calculate the c/a ratio of a HCP unit cell? 18. Magnesium is HCP crystal structure, what is the volume of the Mg unit cell? 19. What is the value of c, for magnesium? (Hint: Volume-basal area x height.) 20. What is the value of a, for magnesium? (Hint: Volume basal area x height)
2. FCC Structure-Assemble the structure and answer the following: a. What is the length of the...
2. FCC Structure-Assemble the structure and answer the following: a. What is the length of the face diagonal in terms of the lattice constant "a"? b. What is the length of the face diagonal in terms of the atomic radius "r"? c. What is the linear atomic density along the body diagonal? (Number of Atoms/Length) d. What is the linear atomic density along the face diagonal? e. How many atomic volumes are contained in the unit cell? **Remember atoms at...
1) (8 points) Walter White who lives in Simeranya (a utopic city in Anarres) prepares blue...
1) (8 points) Walter White who lives in Simeranya (a utopic city in Anarres) prepares blue crystals, named as myth. Myth has a molecular formula of AxBy, adopts an cubic arrangement of atoms as shown on the left. Find out how many atoms are present in each unit cell. a) Determine the molecular formula of myth. b) Calculate the atomic packing factor (APF) of the given arrangement. The atomic radii of A (red) and B (blue) are equal to 120...
Answer the following questions Carbone graphite crystallizes in the hexagonal system with the unit cell parameters:...
Answer the following questions Carbone graphite crystallizes in the hexagonal system with the unit cell parameters: a=245pm, c 670pm. 1. Draw the unit cell. How many carbon atoms per unit cell. Specify the motif. 2. Give the coordinates of all atoms in the unit cell Give a projection of the structure in the (001) plane. 3. What is the coordination number of carbon atoms? 4. 5. Specify the hybridization of carbon. 6. Give the interatomic distances de-c? 7. Calculate the...
3. A compound comprising of Pt and N is calculated to adopt the cubic structure shown...
3. A compound comprising of Pt and N is calculated to adopt the cubic structure shown below (a derivative of the zinc blende structure). The Pt atoms form an fcc unit cell and N atoms occupy all tetrahedral sites. Please answer the following questions regarding this compound and its structure. (a) Identify the N atoms as either large spheres or small spheres (b) Indicate the coordination of the Natoms (show below (c) What is the formula of the compound how...
Crystal Lattices EXPERIMENT B-261 PRE-LAB QUESTIONS Name Daniel Gonzalez Date 10 3019 1 What is a...
Crystal Lattices EXPERIMENT B-261 PRE-LAB QUESTIONS Name Daniel Gonzalez Date 10 3019 1 What is a unit cell? - The smallest pahay wit that has all of the characteristische au t o atomsons, o molecules in the Solid sed or strictures of Solids the sinal laties of ams, insp e ctes, in this case, to a Crystalline solid . Vuit alls reflect the Stoichiority of the colid 2 What is a crystal lattice? - in a three-dimensional lattice unit alls...
What is the vapor pressure of water at 100 degree C (at sea level)? What unit...
What is the vapor pressure of water at 100 degree C (at sea level)? What unit cells comprise crystalline solids? What are the type of crystal wee Vo solids and differentiate between them type of packing arrangements do they form? How many atoms exist in these packing structures? show The vapor pressure of water at 25 degree C is 23.8 torr, and the heat of evaporation of water vapor pressure of water at 50 degree C. Silver metal crystallizes in...
Unit Cell Calculations Name _____________________________ Unit Cells: The Simplest Repeating Unit in a Crystal The structure...
![](https://lh4.googleusercontent.com/K_IdXKabFLhtXXOIgQQGWz-LYlYNPa5z9cPt6FQy3eCY_hrY26qZS8XFBDdXJxqT5rgw1lAAnw6EBuTmrr7-OGOL5RkSwGNWJ97ys65Nc5ZjNeeCGSQ-UGT6SRqFEqehUHwDJLPp" aria-describedby="jt3"><img alt="unitcell1.png)
Unit Cell Calculations Name
_____________________________
Unit Cells: The Simplest Repeating Unit in a Crystal
The structure of solids can be described as if they were
three-dimensional analogs of a piece of wallpaper. Wallpaper has a
regular repeating design that extends from one edge to the other.
Crystals have a similar repeating design, but in this case the
design extends in three dimensions from one edge of the solid to
the other. We can unambiguously describe a piece of wallpaper by...
3.2 Fundamental Concepts (a) To which crystal system does this unit cell belong? 3.1 What is...
3.2
Fundamental Concepts (a) To which crystal system does this unit cell belong? 3.1 What is the difference between atomic structure and crystal structure? (b) What would this crystal structure be called? Crystal Systems (c) Calculate the density of the material, given that its atomic weight is 145 g/mol. 3.2 The accompanying figure shows a unit cell for a hypothetical metal. gix oF OCKI 2ire ebcomreg in z4 ebn doss eosi ba +2 mstera ixa े ed 900 Xese 0.40...
NaCl has a rock salt crystal structure with a unit cell edge length of 0.56 nm. The atomic weights of the Na and Cl are 23 and 35.5 g/mol, respectively, and the Avogadro's number is 6.022 x 10“ formula units/mol. (a) Draw a unit cell to show the crystal structure of the NaCl. (b) What is the coordination number of the atoms in this structure? (c) How many Na atoms and Cl atoms in one unit-cell of such a structure?...
16. Calculate the number of atoms per unit cell, coordination number, and atomic packing factor for an HCP cell. 17. Assuming ideal spherical atoms calculate the c/a ratio of a HCP unit cell? 18. Magnesium is HCP crystal structure, what is the volume of the Mg unit cell? 19. What is the value of c, for magnesium? (Hint: Volume-basal area x height.) 20. What is the value of a, for magnesium? (Hint: Volume basal area x height)
2. FCC Structure-Assemble the structure and answer the following: a. What is the length of the face diagonal in terms of the lattice constant "a"? b. What is the length of the face diagonal in terms of the atomic radius "r"? c. What is the linear atomic density along the body diagonal? (Number of Atoms/Length) d. What is the linear atomic density along the face diagonal? e. How many atomic volumes are contained in the unit cell? **Remember atoms at...
1) (8 points) Walter White who lives in Simeranya (a utopic city in Anarres) prepares blue crystals, named as myth. Myth has a molecular formula of AxBy, adopts an cubic arrangement of atoms as shown on the left. Find out how many atoms are present in each unit cell. a) Determine the molecular formula of myth. b) Calculate the atomic packing factor (APF) of the given arrangement. The atomic radii of A (red) and B (blue) are equal to 120...
Answer the following questions Carbone graphite crystallizes in the hexagonal system with the unit cell parameters: a=245pm, c 670pm. 1. Draw the unit cell. How many carbon atoms per unit cell. Specify the motif. 2. Give the coordinates of all atoms in the unit cell Give a projection of the structure in the (001) plane. 3. What is the coordination number of carbon atoms? 4. 5. Specify the hybridization of carbon. 6. Give the interatomic distances de-c? 7. Calculate the...
3. A compound comprising of Pt and N is calculated to adopt the cubic structure shown below (a derivative of the zinc blende structure). The Pt atoms form an fcc unit cell and N atoms occupy all tetrahedral sites. Please answer the following questions regarding this compound and its structure. (a) Identify the N atoms as either large spheres or small spheres (b) Indicate the coordination of the Natoms (show below (c) What is the formula of the compound how...
Crystal Lattices EXPERIMENT B-261 PRE-LAB QUESTIONS Name Daniel Gonzalez Date 10 3019 1 What is a unit cell? - The smallest pahay wit that has all of the characteristische au t o atomsons, o molecules in the Solid sed or strictures of Solids the sinal laties of ams, insp e ctes, in this case, to a Crystalline solid . Vuit alls reflect the Stoichiority of the colid 2 What is a crystal lattice? - in a three-dimensional lattice unit alls...
What is the vapor pressure of water at 100 degree C (at sea level)? What unit cells comprise crystalline solids? What are the type of crystal wee Vo solids and differentiate between them type of packing arrangements do they form? How many atoms exist in these packing structures? show The vapor pressure of water at 25 degree C is 23.8 torr, and the heat of evaporation of water vapor pressure of water at 50 degree C. Silver metal crystallizes in...
3.2
Fundamental Concepts (a) To which crystal system does this unit cell belong? 3.1 What is the difference between atomic structure and crystal structure? (b) What would this crystal structure be called? Crystal Systems (c) Calculate the density of the material, given that its atomic weight is 145 g/mol. 3.2 The accompanying figure shows a unit cell for a hypothetical metal. gix oF OCKI 2ire ebcomreg in z4 ebn doss eosi ba +2 mstera ixa े ed 900 Xese 0.40...
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