Chemistry Chemistry Practice Problems Solutions Library

Unit Cell Solutions Library

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185 solutions

Unit Cell

Q. Iron (Fe) has a BCC crystal structure, an atomic radius of 0.124 nm, and an atomic weight of 55.85 g/mol. What is its theoretical density in g/cm3?

Solved • Mar 31, 2020

Unit Cell

Q. What is the difference between atomic structure and crystal structure? a) Atomic structure relates to the arrangement of protons and neutrons in th...

Solved • Mar 31, 2020

Unit Cell

Q. Identify the definition for each of these terms.Coordination number:Unit Cell: Crystalline solid:the number of atoms (or ions) surrounding an atom ...

Solved • Mar 31, 2020

Unit Cell

Q. Sketch the atomic packing of the (100) plane in the FCC crystal structure. a) Determine the planar density for this plane and compare to the planar...

Solved • Mar 25, 2020

Unit Cell

Q. In which of the following unit cells is drawn a (101) plane?

Solved • Mar 25, 2020

Unit Cell

Q. Show that the atomic packing factor for BCC is 0.68. 

Solved • Mar 20, 2020

Unit Cell

Q. The density of solid Cr is 7.15 g/cm3. How many atoms are present per cubic centimeter of Cr? in atoms/cm^3As a solid, Cr adopts a body-centered cu...

Solved • Mar 17, 2020

Unit Cell

Q. When spheres of radius r are packed into a body-centered cubic unit cell, they occupy 68.0% of the available volume. Use this to calculate the valu...

Solved • Jan 23, 2020

Unit Cell

Q. An unknown metal is found to have a density of 6.87g/cm3 and to crystallize in a body-centered cubic lattice. The edge of the unit cell is 0.294 nm...

Solved • Jan 23, 2020

Unit Cell

Q. Pd crystallizes with a face-centered cubic unit cell. It has a density of 6.00 g/cm3 and a radius of 138 pm and a FW of 106.42 g/mol. Use these dat...

Solved • Jan 23, 2020

Unit Cell

Q. An atom located on a face of a unit cell is shared equally between ____ unit cells.23468

Solved • Nov 21, 2019

Unit Cell

Q. Platinum (Pt) forms a face centered cubic unit cell and has a 139 pm atomic radius. Calculate the density of platinum based on the atomic radius an...

Solved • Nov 4, 2019

Unit Cell

Q. A sample of copper is found to have a close packing arrangement with an A-B-C-A-B-C pattern between layers. Which of the following would be the coo...

Solved • Nov 1, 2019

Unit Cell

Q. A substance containing three elements (A, B and C) forms a cubic unit cell with A atoms at a every corner, B atoms at every edge, and a C atom in t...

Solved • Nov 1, 2019

Unit Cell

Q. Which of the following unit cells has the least efficient packing efficiency?(a) Body centered cubic(b) Face centered cubic(c) Hexagonal(d) Simple ...

Solved • Nov 1, 2019

Unit Cell

Q. Show how the zinc blende unit cell contains a cation-to-anion ratio of 1:1.

Solved • Oct 3, 2019

Unit Cell

Q. The density of solid Cr is 7.15 g/cm 3. How many atoms are present per cubic centimeter of Cr? in atoms/cm3As a solid, Cr adopts a body-centered cu...

Solved • Aug 29, 2019

Unit Cell

Q. The density of solid Ni is 8.90 g/cm3. How many atoms are present per cubic centimeter of Ni?_____ atoms/cm3As a solid, Ni adopts a face-centered c...

Solved • Aug 27, 2019

Unit Cell

Q. Calculate the number of atoms per unit cell in each type of cubic unit cell.Enter three integers separated by commas (e.g., 1, 2, 3) in the followi...

Solved • Aug 27, 2019

Unit Cell

Q. An oxide of uranium crystallizes with the following unit cell (uranium = gray; oxygen = red) What is the formula of the oxide?

Solved • Aug 7, 2019

Unit Cell

Q. Platinum nanoparticles of diameter ~2 nm are important catalysts in carbon monoxide oxidation to carbon dioxide. Platinum crystallizes in a face-ce...

Solved • Dec 6, 2018

Unit Cell

Q. Platinum nanoparticles of diameter ~2 nm are important catalysts in carbon monoxide oxidation to carbon dioxide. Platinum crystallizes in a face-ce...

Solved • Dec 6, 2018

Unit Cell

Q. An ideal quantum dot for use in TVs does not contain any cadmium due to concerns about disposal. One potential material for this purpose is InP, wh...

Solved • Nov 27, 2018

Unit Cell

Q. You may want to reference (Pages 460 - 462) Section 11.7 while completing this problem.Which of the following statements are true?(a) The liquid cr...

Solved • Nov 27, 2018

Unit Cell

Q. Sodium oxide (Na2O) adopts a cubic structure with Na atoms represented by green spheres and O atoms by red spheres.Describe the shape of the coordi...

Solved • Nov 27, 2018

Unit Cell

Q. Sodium oxide (Na2O) adopts a cubic structure with Na atoms represented by green spheres and O atoms by red spheres.The unit cell edge length is 5.5...

Solved • Nov 27, 2018

Unit Cell

Q. Alabandite is a mineral composed of manganese(II) sulfide (MnS). The mineral adopts the rock salt structure. The length of an edge of the MnS unit ...

Solved • Nov 27, 2018

Unit Cell

Q. The unit cell of a compound containing potassium, aluminum, and fluorine is shown here.What is the empirical formula?

Solved • Nov 27, 2018

Unit Cell

Q. The unit cell of a compound containing potassium, aluminum, and fluorine is shown here.What type of lattice does this crystal possess (all three la...

Solved • Nov 27, 2018

Unit Cell

Q. An element crystallizes in a face-centered cubic lattice. The edge of the unit cell is 4.078×10−8 cm, and the density of the crystal is 19.30 g/cm3...

Solved • Nov 27, 2018

Unit Cell

Q. Aluminum metal crystallizes in a face-centered cubic unit cell.How many Aluminum atoms are in a unit cell?

Solved • Nov 27, 2018

Unit Cell

Q. Aluminum metal crystallizes in a face-centered cubic unit cell.Estimate the length of the unit cell edge, a, from the atomic radius of Aluminum (1....

Solved • Nov 27, 2018

Unit Cell

Q. Which arrangement of atoms in a lattice represents close-packing?

Solved • Nov 27, 2018

Unit Cell

Q. Consider the two-dimensional square lattice of the figure below. The "packing efficiency" for a two-dimensional structure would be the area of the ...

Solved • Nov 27, 2018

Unit Cell

Q. The unit cell of a compound containing Co and O has a unit cell shown below. The Co atoms are on the corners, and the O atoms are completely within...

Solved • Nov 27, 2018

Unit Cell

Q. In the unit cell drawing on the right, why do we see eight Sm atoms and nine Co atoms if the empirical formula is SmCo5?

Solved • Nov 27, 2018

Unit Cell

Q. Which one of these unit cells would you expect to represent the densest packing of spheres?

Solved • Nov 27, 2018

Unit Cell

Q. Imagine the primitive cubic lattice. Now imagine grabbing the top of it and stretching it straight up. All angles remain 90 .What kind of primitive...

Solved • Nov 27, 2018

Unit Cell

Q. At standard temperature and pressure the molar volumes of Cl2 and NH3 gases are 22.06 and 22.40 L, respectively.On cooling to 160 K, both substance...

Solved • Nov 27, 2018

Unit Cell

Q. Tausonite, a mineral composed o f Sr, O, and Ti, has the cubic unit cell shown in the drawing .What is the empirical formula of this mineral?

Solved • Nov 27, 2018

Unit Cell

Q. Tausonite, a mineral composed of Sr, O, and Ti, has the cubic unit cell shown in the drawing .To see the full coordination environment of the other...

Solved • Nov 27, 2018

Unit Cell

Q. Two patterns of packing for two different are shown here. Determine the two-dimensional unit cell for (i).

Solved • Nov 27, 2018

Unit Cell

Q. The densities of the elements K, Ca, Sc, and Ti are 0.86, 1.5, 3.2, and 4.5 g/cm3, respectively. One of these elements crystallizes in a body-cente...

Solved • Nov 27, 2018

Unit Cell

Q. The densities of the elements K, Ca, Sc, and Ti are 0.86, 1.5, 3.2, and 4.5 g/cm3, respectively. One of these elements crystallizes in a body-cente...

Solved • Nov 27, 2018

Unit Cell

Q. What type of two-dimensional lattice describes the structure of a single layer of close-packed atoms?Close packing of equal-sized spheres. Close pa...

Solved • Nov 27, 2018

Unit Cell

Q. Two patterns of packing two different spheres are shown here.Determine whether the lattice vectors are of the same length or of different lengths f...

Solved • Nov 27, 2018

Unit Cell

Q. At room temperature and pressure RbI crystallizes with the NaCl-type structure. Use ionic radii to predict the length of the cubic unit cell edge. ...

Solved • Nov 27, 2018

Unit Cell

Q. At room temperature and pressure RbI crystallizes with the NaCl-type structure.Use ionic radii to predict the length of the cubic unit cell edge.

Solved • Nov 27, 2018

Unit Cell

Q. At room temperature and pressure RbI crystallizes with the NaCl-type structure.At high pressure the structure transforms to one with a CsCl-type st...

Solved • Nov 27, 2018

Unit Cell

Q.  The structures of CsCl, NaCl, and ZnS. Each structure type can be generated by the combination of a two-atom motif and the appropriate lattice.CuI...

Solved • Nov 27, 2018

Unit Cell

Q. CuI, CsI, and NaI each adopt a different type of structure. The three different structures are those shown in the following figure.Use ionic radii,...

Solved • Nov 27, 2018

Unit Cell

Q. Spinel is a mineral that contains 37.9% Al, 17.1% Mg, and 45.0% O, by mass, and has a density of 3.57 g/cm3. The unit cell is cubic, with an edge l...

Solved • Nov 27, 2018

Unit Cell

Q. Silicon has a face-centered cubic crystal structure with unit cell edge length of 5.43 Å and four atoms per unit cell.Suppose you dope that 1 - cm3...

Solved • Nov 27, 2018

Unit Cell

Q. Ni3Al is used in the turbines of aircraft engines because of its strength and low density. Nickel metal has a cubic close-packed structure with a f...

Solved • Nov 27, 2018

Unit Cell

Q. Clausthalite is a mineral composed of lead selenide (PbSe). The mineral adopts a NaCl-type structure. The density of PbSe at 25 oC is 8.27 g/cm3.Ca...

Solved • Nov 27, 2018

Unit Cell

Q. A particular form of cinnabar (HgS) adopts the zinc blende structure shown. The length of the unit cell side is 5.852 Å. Calculate the density of H...

Solved • Nov 27, 2018

Unit Cell

Q. A particular form of cinnabar (HgS) adopts the zinc blende structure shown. The length of the unit cell side is 5.852 Å. The mineral tiemmanite (Hg...

Solved • Nov 27, 2018

Unit Cell

Q. Consider the unit cells shown here for three different structures that are commonly observed for metallic elements. Which structure(s) corresponds ...

Solved • Nov 27, 2018

Unit Cell

Q. Sodium metal (atomic weight 22.99 g/mol) adopts a body-centered cubic structure with a density of 0.97 g/cm3.If it didnt react so vigorously, sodiu...

Solved • Nov 27, 2018

Unit Cell

Q. Calcium crystallizes with a body-centered cubic structure.How many Ca atoms are contained in each unit cell?

Solved • Nov 27, 2018

Unit Cell

Q. Calcium crystallizes with a body-centered cubic structure.How many nearest neighbors does each Ca atom possess?

Solved • Nov 27, 2018

Unit Cell

Q. Calcium crystallizes with a body-centered cubic structure.Estimate the length of the unit cell edge, a, from the atomic radius (r) of calcium, 1.97...

Solved • Nov 27, 2018

Unit Cell

Q. Iridium crystallizes in a face-centered cubic unit cell that has an edge length of 3.833 Å. The atom in the center of the face is in contact with t...

Solved • Nov 27, 2018

Unit Cell

Q. Iridium crystallizes in a face-centered cubic unit cell that has an edge length of 3.833 Å. The atom in the center of the face is in contact with t...

Solved • Nov 27, 2018

Unit Cell

Q. The unit cell of nickel arsenide is shown here. What type of lattice does this crystal possess?

Solved • Nov 27, 2018

Unit Cell

Q. The unit cell of nickel arsenide is shown here. What is the empirical formula?

Solved • Nov 27, 2018

Unit Cell

Q. Imagine you generate a three-dimensional lattice by taking a and b vectors that form a two-dimensional square lattice. Then add a third vector, c, ...

Solved • Nov 27, 2018

Unit Cell

Q. An atom has radius of 138 pm and crystallizes in a body-centered cubic unit cell. What is the volume of the unit cell?

Solved • Nov 27, 2018

Unit Cell

Q. Calculate the packing efficiency of the two-dimensional lattice shown here:

Solved • Nov 27, 2018

Unit Cell

Q. What is the edge length of a body-centered cubic unit cell made up of atoms that each has a radius of 168 pm?

Solved • Nov 27, 2018

Unit Cell

Q. Which compound is most likely to crystallize in the zinc blende structure?(a) RbCl (Rb+ radius = 148 pm; Cl– radius = 181 pm)(b) MgCl2 (Mg2+ = radi...

Solved • Nov 27, 2018

Unit Cell

Q. Compare the crystal structure of diamond (C) and zinc blende (ZnS). What are the key similarities and differences between the two structures?

Solved • Nov 27, 2018

Unit Cell

Q. A compound with the formula Rb3C60 has been shown to demonstrate superconductivity below 30.0 K.Given that the C60 molecules have a face-centered c...

Solved • Nov 27, 2018

Unit Cell

Q. Perovskite is a compound with a cubic unit cell and has a strontium atom at the center of the cell, titanium atoms at the corners of the unit cell,...

Solved • Nov 27, 2018

Unit Cell

Q. Perovskite is a compound with a cubic unit cell and has a strontium atom at the center of the cell, titanium atoms at the corners of the unit cell,...

Solved • Nov 27, 2018

Unit Cell

Q. Why are X-rays used for crystallography? Why not use some other, more accessible type of electromagnetic radiation such as ultraviolet light?

Solved • Nov 27, 2018

Unit Cell

Q. The unit cells for lithium oxide and silver iodide are shown. Identify the structure of each of the two unit cells shown below as the rock salt str...

Solved • Nov 27, 2018

Unit Cell

Q. The unit cells for lithium oxide and silver iodide are shown. Identify the structure of each of the two unit cells shown below as the rock salt str...

Solved • Nov 27, 2018

Unit Cell

Q. Determine the coordination number for each structure.

Solved • Nov 27, 2018

Unit Cell

Q. Calculate the packing efficiency of the body-centered cubic unit cell.

Solved • Nov 27, 2018

Unit Cell

Q. The unit cells for cesium chloride and barium chloride are shown. Identify the structure of each of the two unit cells shown below as the rock salt...

Solved • Nov 27, 2018

Unit Cell

Q. Consider the rock salt structure in the figure:What type of structure would result if all the anions were somehow removed, leaving only cations?

Solved • Nov 27, 2018

Unit Cell

Q. Chromium crystallizes with a body-centered cubic unit cell. The radius of a chromium atom is 125 pm. Calculate the density of solid crystalline chr...

Solved • Nov 27, 2018

Unit Cell

Q. An oxide of rhenium crystallizes with the unit cell depicted here (where rhenium = gray and oxygen = red).What is the formula of the oxide?

Solved • Nov 27, 2018

Unit Cell

Q. Rhodium has density of 12.43 g/cm3 and crystallizes with the face-centered cubic unit cell.Calculate the radius of a rhodium atom.

Solved • Nov 27, 2018

Unit Cell

Q. Barium has a density of 3.59 g/cm3  and crystallizes with a body-centered cubic unit cell. Calculate the radius of a barium atom.

Solved • Nov 27, 2018

Unit Cell

Q. Polonium crystallizes with a simple cubic structure. It has a density of 9.3 g/cm3, a radius of 167 pm, and a molar mass of 209 g/mol.Use these dat...

Solved • Nov 27, 2018

Unit Cell

Q. Rhodium crystallizes in a face-centered cubic unit cell. The radius of a rhodium atom is 135 pm.Determine the density of rhodium in g/cm3.

Solved • Nov 27, 2018

Unit Cell

Q. Consider the body-centered cubic structure shown below: .What is the length of the line (labeled c) that runs from one corner of the cube diagonall...

Solved • Nov 27, 2018

Unit Cell

Q. The density of an unknown metal is 12.3 g/cm3 and its atomic radius is 0.134 nm. It has a face-centered cubic lattice. Find the atomic mass of this...

Solved • Nov 27, 2018

Unit Cell

Q. An unknown metal is found to have a density of 7.8748 g/cm3 and to crystallize in a body-centered cubic lattice. The edge of the unit cell is found...

Solved • Nov 27, 2018

Unit Cell

Q. When spheres of radius r are packed in a body-centered cubic arrangement, they occupy 68 % of the available volume. Use the fraction of occupied vo...

Solved • Nov 27, 2018

Unit Cell

Q. Calculate the fraction of empty space in cubic closest packing to five significant figures.

Solved • Nov 27, 2018

Unit Cell

Q. A tetrahedral site in a close-packed lattice is formed by four spheres at the corners of a regular tetrahedron. This is equivalent to placing the s...

Solved • Nov 27, 2018

Unit Cell

Q. An oxide of titanium crystallizes with the following unit cell (titanium = gray; oxygen = red).What is the formula of the oxide?

Solved • Nov 27, 2018

Unit Cell

Q. The unit cells for lithium oxide and silver iodide are shown below.Show that the ratio of cations to anions in each unit cell corresponds to the ra...

Solved • Nov 27, 2018

Unit Cell

Q. Determine the number of atoms per unit cell for each of the following metals .Polonium

Solved • Nov 27, 2018

Unit Cell

Q. Platinum crystallizes with the face-centered cubic unit cell. The radius of a platinum atom is 139 pm .Calculate the edge length of the unit cell.

Solved • Nov 27, 2018

Unit Cell

Q. Platinum crystallizes with the face-centered cubic unit cell. The radius of a platinum atom is 139 pm.Calculate the density of platinum in g/cm3.

Solved • Nov 27, 2018

Unit Cell

Q. Show how the cesium chloride and sodium chloride unit cells each contain a cation-to-anion ratio of 1:1.

Solved • Nov 27, 2018