The density of aluminum is 2.7 g/cm3; that of silicon is 2.3 g/cm3. Explain why Si has the lower density even though it has heavier atoms.

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: Amorphous silica, SiO2, has a density of about 2.2 g/cm3,whereas the density of crystalline quartz,…

A: Option (e). Crystalline solids are the one in which atoms are arranged in an orderly repeating…

Q: Explain how homogeneous and heterogeneous alloys differ. Describe the differences between…

A: An alloy is a uniform mixture. It is made up of two or more chemical elements, of which at least one…

Q: 1.) Given this information, answer the following questions for crystalline MgO. ionic radius of Mg:…

A: Here we need to find the crystal structure, theoretical lattice parameter and density from the data…

Q: 7. What type of substance is graphite? a. lonic d. Metallic b. Network covalent e. None of the above…

A:

Q: calculate density in g cm^-3 - molar mass is 200.5 g.mol - simple cubic lattice - radius of 185 pm

A: Given, The radius of atoms, (r)=185 pm. The edge length of the unit cell, (a)=2r=370 pm=3.70×10-8…

Q: Which element is a liquid at 758 K and standard pressure? A) Gold B) Silver C) Platinum D) thallium

A:

Q: A hypothetical metal A with a BCC lattice structure has a density of 8.87 g/cm3. If a hypothetical…

A: Given: density of the metal A = 8.87 g/cm3 To find: The density of metal B

Q: Silicon has a face-centred cubic structure with two atoms per lattice point, just like diamond. At…

A: Given : a = 543.1 pm

Q: The ionic radii of the Mg21 and 022 ions are 0.86 Å and 1.26 Å, respectively. Given that the…

A:

Q: Usually, atoms move slower in solids than they do in liquids. Which evidence from the passage best…

A: Diffusion is a process of movement of the particles from a region of higher concentration to a…

Q: What type of bonding is predominant in ceramics?

A: Solution-   in the ceramics two type of bonding found  (1)ionic and (2) covalent. An ionic bond…

Q: What is difference between the structure of diamond and graphite?

A:

Q: Have each group member select and study a material from the section on ceramics, cement, and glass.…

A:

Q: Which would you expect to be the more ductile element,(a) Ag or Mo, (b) Zn or Si? In each case…

A: Silver is a more ductile element than molybdenum. Ag has more valence electrons which makes the…

Q: >Explain why the viscosity of liquid sulfur increases with increasing temperature initially, but…

A: The liquid S viscosity increases as temperature increases initially but on further temperature it…

Q: What is the difference between glass and silicate?  this is the question i was asked but not sure…

A: Although glass is silica, it is not crystalline silica. glass is amorphous SiO2, or silica glass.…

Q: Describe the process of doping and explain how it alters the atomic structure of silicon.

A:

Q: Is arsenic-doped germanium a p-type or n-type semiconductor?

A: The trivalent impurity atoms such as indium, gallium are doped with an intrinsic semiconductor, then…

Q: 74. Assume the two-dimensional structure of an ionic compound, M,A,, is

A: To determine the empirical formula for the below two-dimensional structure of an ionic compound

Q: <p>Explain why the graphite structure of carbon allows graphite to be used as a lubricant, but…

A: In graphite, flat sheets of carbon are connected together in the form of interconnected hexagonal…

Q: How do atomic radius ratios relate to strength in alloys?

A: The smaller the atomic radius, the more influence the nucleus has on reactivity. Since the nucleus…

Q: Why Graphite is more compressible than diamond ?

A: Diamond and graphite are allotropes of carbon. The similarity between the two is the constituent…

Q: Calculate the density of aluminum, given that it has an fcc crystal structure,an atomic radius of…

A: Firstly, calculate the edge length. For FCC, the relation between the radius and edge length (a) is:…

Q: What names are given to SiO2 when it exists in the following two solid-state forms? Amorphous Solid…

A: The correct answer about SiO2 is given below

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

A: The reason is as follows,

Q: In which direction along the periodic table does thermal conductivity generally increase?

A: Thermal conductivity does not show regular increase or decrease in periodic table.In every group and…

Q: - The density of potassium, which has the BCC structure, is 0.855 g/cm^3. The atomic weight   of…

A:

Q: A metal has the CFC crystalline structure, density of 7g / cm3 , and an atomic weight of 44g / mol.…

A: solid state  finding out radius of FCC system

Q: LiH crystallizes with the same structure as NaCl. Given the ionic radii and the molar mass of Li+ (…

A:

Q: Solid gold (Au) has a fcc crystal structure, and atomic radius of 144 pm. Using the information in…

A:

Q: How many molecular orbitals are present in the valence band of a sodium crystal with a mass of 5.45…

A: The number of sodium atom in a sodium crystal with a mass of 5.45 g is calculated as shown below.…

Q: What are the various phases of SiO2?

A: The objective of the question is to write the various phases of SiO2.

Q: What type of semiconductor is obtained when silicon is doped with arsenic?

A: Silicon belongs to group 14. It has atomic number 14 and has 4 valence e-. Arsenic belongs to group…

Q: The main element of glass is actually a compound of _______:  a. silicon b. tin c. crystallized…

A: Solids on the basis of arrangement of particles can be classified into amorphous solids and…

Q: Why does conductivity of silicon increase with the rise in temperature.

A: The conductivity of silicon increases with the rise in temperature.

Q: An ionic solid, MX, has the ionic radius ratio, r,/r., of more than 0. 0.732. Calculate the anionic…

A: We know that the radius ratio is the ratio of cation to the ratio of anion.  Here, r+ = Ratio of…

Q: Describe the features of Network Covalent Atomic Solids, Carbon and Silicates?

A: The features of Network Covalent Atomic Solids, Carbon, and Silicates have to be given.

Q: With proper reasons justify at room temperature why silicon is opaque and silicon dioxide is…

A: The silicon ( Si) (Z=14)  is opaque at room temperature. The silicon dioxide (SiO2) transperent at…

Q: Explain how these vacancies allow oxide ions to move through the material.

A: The oxide ions move through the material is as follows.

Q: Relate the Unit Cell Volume, Edge Length, and Atomic Radius with examples?

A: Edge length is denoted by 'a' and atomic radius is denoted by 'r'. In simple cubic unit cell, atoms…