How do the layers of carbonate molecules differ from one another for Calcite (CaCO3) structure compared to Dolomite ((Ca,Mg)CO3) and What is the coordination number of calcium?

Q: (a) What change occurs when AgCl is doped with CdCl2?(b) What type of semiconductor is produced when…

A: The small gap in valance band and conduction band in semiconductors lead to jumping of electrons…

Q: Which of the following alloys does not contain copper?           (A) Bronze          (B) Pewter…

A: Bronze = copper + tin  Pewter = Tin + antimony + copper  Sterling silver = silver + usually copper

Q: Dolomite has a very similar structure in which Mg substitutes for Ca in alternating layers. Assume…

A: In crystal structures, the elements with similar charges and sizes can replace one another. This…

Q: Define the term Interstitial alloys?

A: Alloy is a mixture of more than one metal which has superior properties than any individual metal.…

Q: CO2 and SiO2 have similar formulae but very different melting points, why?

A:

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: What are Nonoxide Ceramics?

A: Ceramics are minerals which are non-metallic and inorganic in nature. It has huge variety, like…

Q: If Na+ ions were to substitute for magnesium ions in MgO, in order to preserve electroneutrality,…

A: Impurity defects are produced in the MgO crystal. Two Na+ ions replaced one Mg2+ ion for…

Q: 11. Several conformational isomers of butane are illustrated below. Which has the LOWEST energy? CH3…

A:

Q: Replacement of aluminum ions in kaolinite with magnesium ions yields a compound with the formula…

A: Oxidation number is the charge on the ion of an atom. Oxidation state represents the number of…

Q: 48) An unknown hydrate of zinc sulfate, ZnSO4 • XH2O, is heated to give 30.8% water. What is the…

A: The unknown hydrate of zinc sulfate is given by the formula- ZnSO4 • x H2O Water obtained after…

Q: The mineral clausthalite is composed of lead selenide (PbSe). This mineral adopts the NaCl structure…

A: Unit cell can be defined as the repeating unit in crystal structure.

Q: As a solid CrCr adopts a body-centeredbody-centered cubic unit cell with an edge length of 289…

A: Edge length, a = 289 pm 1 pm = 10-10 cm a = 289 × 10-10cm For BCC, Number of atoms per unit cell = 2

Q: List the major classes of minerals and discuss the main chemical characteristic of each class.

A: Minerals are classified based on their chemical constitution. Mineral resources are finite and…

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: An AX ceramic compound has an HCP crystal structure. If the radii of the A and X ions are 0.12 and…

A:

Q: how do u know its 1,1,0?

A: In the given question we have a plane (1,1,0) defined in the space where we place a plane parallel…

Q: Calcite (CaCO3) structure compared to Dolomite ((Ca,Mg)CO3) 1. What is the coordination number of…

A: Coordination number of an atom is the number of other atoms to which it is bonded. The coordination…

Q: explain why diamond is a very hard substance and graphite (e.g. pencil ‘lead’) is very soft.

A: The solution is given below -

Q: What is meant by the term coordination number in the structure of a solid? How does the coordination…

A:

Q: For each of the following alloy compositions, indicatewhether you would expect it to be a…

A: Substitutional alloys are formed when the atoms of solute occupy the position of solvent atoms in…

Q: (a) Pure iron has a change in crystal structure from BCC to FCC when heating up above 912°C. If the…

A: A unit cell is a most basic and least volume consuming repeating structure of any solid.  BCC- Body…

Q: What colour are SnC12.2H2O crystals?

A: SnCl2.2H2O called Sn(II) chloride dihydrate is also known as stannous chloride. The 2 H2O…

Q: e length

A:

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: An AX ceramic compound has an HCP crystal structure. If the radii of the A and X ions are 0.114 and…

A: We need to find density of material.

Q: Draw the Perovskite crystal structure in 3 dimensions. Give an example. Describe the neighbors and…

A: The general formula of perovskite is ABX3. A and B are cations whereas X represents anions. The size…

Q: The structure of the unit cell when CaF, crystallizes is shown below: What is the arrangement of the…

A: In CaF2 unit cell, each Ca2+ is surrounded by 8 F- atoms.

Q: Calculate the volume in cubic nanometers of the unit cell of the Cu crystal structure at 40 ° C

A: Copper(Cu) has face center cubic (FCC) crystal structure with 4 atoms per unit cell.  Radius of Cu…

Q: The nitride ceramics AIN, GaN, and InN are all semiconductors used in the microelectronics industry.…

A:

Q: which of the following minerals would crystallize early from a cooling silicate magma ? biotite,…

A: Sequence of minerals crystallizing from magma is called Bowen reaction series.

Q: Which of the following is not true about the basic building block of silicate minerals?     (2 نقطة)…

A: Silicates are metal derivatives of silicic acid and can be obtained by using metal oxides or metal…

Q: (b) Many structures of ionic compounds have been described in terms of close packing of a large…

A: 1) In ionic solid no of octahedral void is equal to the number of atom/ lattice points  So cubic…

Crystal Lattices and Unit Cell

Consider a crystal. The regular and repeating pattern of constituent particles is the most distinguishing feature of crystalline solids. A crystal lattice is formed when these particles are replaced with representative points. The three-dimensional arrangement of constituent particles is known as a crystal lattice. Unit cell is that the smallest portion of a space lattice which when repeated in several directions, generate the whole lattice. Unit cell is a building block of a lattice. It is the smallest unit of cell.