
Concept explainers
(a)
Interpretation:The similarities and differences between the coordination number of cubic and hexagonal close packed arrangement should be interpreted.
Concept introduction:Solids have strong intermolecular forces between constituent atoms therefore they have certain pattern in which the repeating unit repeat itself to form complete crystal lattice. This repeating unit is called as unit cells.
(a)

Answer to Problem 1P
Both cubic and hexagonal closed packed structures have same coordination number that is 12.
Explanation of Solution
The cubic closest packed structure has ABC….pattern in which third layer is placed in the depression of second layer. Hence, each atom is surrounded by six atoms of same layer with three atoms of first and third layers. Therefore, the coordination number of nickel atom is 12.
The hexagonal packed structure follows the ABAB…. pattern in which the first and third layer have same arrangement of metal atoms. The metal atom of second layer is surrounded by six metal atoms of same layer and three metal atoms of first and third layers respectively. Hence the coordination number of each atom is 12.
Thus, both cubic and hexagonal closed packed structures have same coordination number with different arrangement of atoms.
(b)
Interpretation: The similarities and differences between the interstitial holes of cubic and hexagonal close packed arrangement should be interpreted.
Concept introduction: Solids have strong intermolecular forces between constituent atoms therefore, they have certain pattern in which the repeating unit repeat itself to form complete crystal lattice. This repeating unit is called as unit cells.
(b)

Answer to Problem 1P
Both cubic and hexagonal closed packed structures have octahedral and tetrahedral holes but in case of cubic close packing, octahedral holes are covered by a layer of sphere.
Explanation of Solution
In the layered structure of solids, the atom of one-layer placed in the depression of previous layer. The space between these voids is called interstitial holes. There are two types of holes; tetrahedral holes (surrounded by four atoms) and octahedral holes (surrounded by six atoms).
In both the hexagonal and cubic close packing, there are two tetrahedral holes and one octahedral hole per packing atom but in case of cubic close packing, octahedral holes are covered by a layer of sphere. Thus, both show similarities in number of interstitial holes.
(c)
Interpretation: The similarities and differences between the unit cells of cubic and hexagonal close packed arrangement should be interpreted.
Concept introduction: Solids have strong intermolecular forces between constituent atoms therefore they have certain pattern in which the repeating unit repeat itself to form complete crystal lattice. This repeating unit is called as unit cells.
(c)

Answer to Problem 1P
The cubic closed packed structures has three layers of atoms with four atoms in the unit cell whereas the hexagonal close packing has three layers with six atoms in each unit cell.
Explanation of Solution
The unit cell is the basic unit of the solid materials. It is the smallest unit that is composed of certain number of the atoms.
In the hexagonal and cubic close packing arrangement, the number of unit cells are different. The hexagonal packing has six atoms in the unit cell as the repeating unit has two layers of spheres. On the contrary, the cubic close packing consists of four atoms in the unit cell as the repeating unit of has three layers of spheres.
Want to see more full solutions like this?
Chapter 6 Solutions
Inorganic Chemistry
- Provide the missing information for each of the two following reacitons: *see imagearrow_forwardDraw an example of the following functional groups: *see imagearrow_forwardAldehydes and Ketones: Show the reaction conditions, and molecules, that connect the reactant to the product. A protecting group will be needed. *see imagearrow_forward
- Aldehydes and Ketones: Show the reaction conditions, and molecules, that connect the reactant to the product. *see imagearrow_forwardProvide the missing information for each of the four reactions: *see imagearrow_forward6. Chlorine dioxide (CIO) is used as a disinfectant in municipal water-treatment plants. It decomposes in a first-order reaction with a rate constant of 14 s. How long would it take for an initial concentration of 0.06 M to decrease to 0.02 M? [6 pts]arrow_forward
- If possible, replace an H atom on the a carbon of the molecule in the drawing area with a methyl group substituent, and replace an H atom on the ẞ carbon with a hydroxyl group substituent. If one of the substituents can't be added for any reason, just don't add it. If neither substituent can be added, check the box under the drawing area. en HO OHarrow_forwardCurved arrows are used to illustrate the flow of electrons. Use the reaction conditions provided and follow the curved arrows to draw the intermediate and product of this hydrohalogenation reaction. Include all lone pairs and charges as appropriate. Br Select to Draw 51°F Sunny esc F1 HBr Select to Draw 1,2-hydride shift Br Select to Draw Q Search F2 F3 F4 1 2 # # 3 DII L F5 F6 F tA $ % Λarrow_forwardplease help i cant find the article to even startarrow_forward
- What are the missing reagents for the spots labeled 1 and 3? Please give a detailed explanation and include the drawings and show how the synthesis proceeds with the reagents.arrow_forwardhelp with the rf values i am so confusedarrow_forwardPredict the organic reactant of X and Y that are involved in the reaction below, and draw the skeletal ("line") structures of the missing organic reactant. Please include all steps & drawings & explanations.arrow_forward
- Physical ChemistryChemistryISBN:9781133958437Author:Ball, David W. (david Warren), BAER, TomasPublisher:Wadsworth Cengage Learning,Chemistry for Engineering StudentsChemistryISBN:9781337398909Author:Lawrence S. Brown, Tom HolmePublisher:Cengage LearningPrinciples of Modern ChemistryChemistryISBN:9781305079113Author:David W. Oxtoby, H. Pat Gillis, Laurie J. ButlerPublisher:Cengage Learning


