9. The density of Al is 2.7 g/cm³ and that of Al2O; is about 4 g/cm³. Describe the characteristics of the aluminum-oxide film. Compare with the oxide film that forms on tungsten. The density of W is 19.254 g/cm and that of WO; is 7.3 g/cm.

Q: Describe and give examples of the following types of crystals:  (a) molecular crystals, (b) metallic…

A: Crystals are basically solid materials that are arranged in a particular organized way. Both types…

Q: Explain the following observation Both carbon and  aluminium are solids, and aluminium form sheets…

A: General properties of metals:  Metals are lusturous Metals are malleable(made into sheets) Metals…

Q: 10. Explain why graphite conducts electricity whereas diamond doesn't. - (include a diagram in your…

A: Graphite is a good conductor of electricity since each carbon atom is linked to three of its…

Q: The electronic structure of a doped semiconductor is shown here.  1.)Is this an example of an…

A: Semiconductors can be defined as the materials whose conductivity lie between metals and insulators.

Q: Lithium crystallizes in a bcc structure with an edge length of 3.509 Å. Calculate its density. What…

A:

Q: he crystalline density of polypropylene is 1.121 g/cm³, and its amorphous density is 0.906 g/cm³.…

A:

Q: What type of bonding would you expect in Silicon nitride? explain the answer and what kind of…

A:

Q: What allows graphite to conduct electricity?

A: Graphite is the most stable allotrope of Carbon. It is the only non-metal that conducts electricity.…

Q: Two students were discussing about the Linde's process, when one of them suggested that Liquefaction…

A: The two factors on which liquification of gases depends are: Temperature Pressure Temperature: At…

Q: Iodine is a solid at room temperature (mp = 113.5 °C) while bromine is a liquid (mp = -7 °C).…

A: Introduction: The group 17 belongs to halogen group having general outer electronic configuration…

Q: What amount of heat, in kJ, would be involved in condensing 19.1 g of CH-ОН? (ДНvaр %3D 38.0 kJ/mol)

A: Heat of condensation is equal in magnitude and opposite in sign. So ∆Hcondensation = - ∆Hvap = -…

Q: Name of Hypothetical Crystal Crystal Structure Radius, r, in Volume, V, in cm Length of one side of…

A: Since you have posted a question with multiple sub-parts, we will solve the first three subparts for…

Q: Identify the set that contains compounds that form an ionic solid, a molecular solid, and a…

A: Option  (A) is the correct answer that is  Li2O , B2O3  , BeO.

Q: Write amorphous carbon

A: Amorphous carbon is basically is reactive carbon which not  having crystalline structure.

Q: An element has hcp packing with a hexagonal unit cell. Its density is 13.3 g/cm3 and the unit cell…

A: Density = 13.3 g/cm3Unit cell volume, a3 = 4.48 x 10-29 m3 = 4.48 x 10-23  cm3For hcp, Z = 4

Q: Which substance has the greatest band gap?a) silicon b) germaniumc) lead d) gold

A:

Q: Use the hybridization and structures of graphite and diamond to explain why graphite conducts…

A: The objective of the question is to explain the reason behind the good electrical conductivity of…

Q: A hypothetical element, Ny, forms a face-centered cubic lattice with an atomic radius of 151 pm.…

A: Given: The molar mass of hypothetical element, Ny, (M) = 115.419 g/mol. The Ny is  face-centered…

Q: How much heat energy is required to convert 74.9 g of solid iron at 29 C to liquid iron at 1538 "C?…

A: In this question, amount of heat energy required to convert 74.9 g of solid iron at 29 °C to liquid…

Q: Define the term, Band-Gap?

A: Electrons are present in the orbits around the nucleus. On coming together of two charges together…

Q: Name and describe the different allotropes of carbon.

A: Carbon has several allotropes, namely, graphite, diamond, fullerenes, nanotubes, graphene, and…

Q: What type of semiconductor is prepared by doping Ga into Si? A) p-type B) n-type C) intrinsic D)…

A:

Q: Which solid has the highest melting point? Why? Ar(s), CCl4(s), LiCl(s), CH3OH(s)

A: The following compounds, Ar (s), CCl4 (s), LiCl (s), CH3OH (s) The melting point depends of the…

Q: What do Doped semiconductors contain?

A: Semiconductors has a conductivity power in between insulators and conductors. The conductivity power…

Q: How does the sea-of-electrons model explain the high electrical conducitivity of gold ?

A: Metallic bonding is a type of chemical bonding, the cations in the metal are surrounded by many…

Q: Define the term Ceramics? Give some examples?

A: The materials that are resistant to corrosion, hard yet brittle is known as ceramics.

Q: (a) What are the C¬C¬C bond angles in diamond?(b) What are they in graphite (in one sheet)? (c)…

A: a) The C-C-C bond angle in carbon is 109.5 degrees. Here all the carbon are sp3 hybridise and…

Q: Why does graphite conduct electricity?

A: Graphite is an allotrope of carbon. It is a covalent solid. It has a trigonal planar geometry. The…

Q: Calculate the IPF for UO, which has the CaF, structure shown in the figure below F ions located at…

A: The given FCC lattice structure is UO2.  In the FCC lattice cube, the edge length is given as, a.…

Q: What amount of heat, in kJ, would be involved in condensing 17.6 g of CH₃OH? (∆Hvap = 38.0 kJ/mol)

A:

Q: The density and associated percent crystallinity for two polytetrafluoroethylene materials are as…

A: A fluoropolymer of tetrafluoroethylene is termed as polytetrafluoroethylene (PTFE). Its general…

Q: Explain why graphite can conduct electricity, but diamond does not.

A: The reason is as follows,

Q: explain why graphite can be used as a lubricant

A: Lubricants are the substances or compounds which are used to reduce friction between two movable…

Q: An unknown metal exhibits FCC crystal structure has an observed atomic radius of 0.14 nm and…

A: Given: Atomic radius = 0.14 nm = 0.14×10-7 cm The density of crystal = 11.538 g/cm3

Q: What amount of heat, in kJ, would be involved in condensing 12.8 g of CH₃OH? (∆Hvap = 38.0 kJ/mol)

A: Mass of CH3OH = 12.8 gm  Molar mass of CH3OH = 32 gm/mole  Number of moles of CH3OH = 12.8/32 = 0.40…

Q: sentences describe the difference in structure or the arrangement of particles of a crystalline and…

A: Answer - Crystalline solid - A crystal or crystalline solid is a solid material whose constituents…

Q: Describe the formation of N-type semiconductor.

A: Kindly get the answer given below.

Q: CaF2 crystallizes is shown below: What is the arrangement of the Ca2+ ions (white spheres)?   FCC…

A:

Q: Which solid has the highest melting point?a) CS2(s) b) CaF2(s)c) C8H18(s) d) Ar(s)

A:

Q: Why are X-rays used for crystallography? Why not use some other, more accessible type of…

A:

Q: Why is graphite soft lubricant and good conductor of electricity?

A: Graphite is a non metal having two dimensional sheet like structure where each carbon atom uses sp2…

Q: A pure metallic solid has an atomic radius of 1.9 Angstrom, an FCC crystal structure and has a…

A:

Q: What is the true density of Zr, an HCP crystal, in g/cm3? Where: Atomic Number = 40  Atomic Weight…

A:

Q: Complete the table below. Name of Hypothetical Crystal Radius, r, in Length of one side of the cell,…

A: Since you have posted a question with multiple sub-parts, we will solve the first three subparts for…

Q: Define the term Semiconductor Type? Which element would you dope into germanium to create a p-type…

A: Conductor: Conductors are materials that allow flowing of heat and electricity through them due to…

Q: Which solid in each pair has the higher melting point and why?a. TiO2(s) or HOOH(s)b. CCl4(s) or…

A: Concept introduction: The melting point is the temperature at which solid state changes to liquid…

Q: Choose the compound that has the lowest surface tension. (Consider intermolecular forces) Не Li Be B…

A: Answer:- This question is answered by using the simple concept of surface tension which is directly…