A sample of an alkali metal that has a b.c.c. unit cell is found to have a mass of 1.000 g and a volume of 1.0298 cm3 (note that this is NOT the volume of the unit cell). The metal is allowed to react with excess water, producing 539.29 mL of hydrogen gas at 0.980 atm and 23 ̊C. a. Identify the metal and write the balanced equation for the reaction with water. b. Determine the unit cell dimensions. c. Give the approximate size of the atom in pm.

Q: 2. ZrC has a rock salt structure (NaCl) which may be considered as two interpenetrating f.c.c.…

A: Given, The lattice of - FCC.a. To draw the unit cell and determine the no. of atoms of each type.b.…

Q: 2. How many octahedral and tetrahedral holes are there in CCP and HCP unit cells?

A:

Q: Magnesium oxide (MgO) has a NaCl type crystal structure. The ionic radii of Mg2+ and O2- ions are…

A: NaCl have FCC lattice.

Q: 4) a. The structure of the ionic salt caF2 is given as follows In the CaF2 structure there are Ca²+…

A: The given problem is based upon type of unit and the arrangement of ions and atoms in the unit cell.

Q: What is the formula of a compound in which the element Y forms ccp lattice and atoms of X occupy…

A:

Q: What type of two-dimensional lattice describes the structure of a single layer of close-packed…

A: The term "closest packed structures" refers to the most tightly packed or space-efficient…

Q: Define the term cubic closest packing?

A:

Q: Analysis shows that a metal oxide has a empirical formula M0.96O. Calculate the percentage of M2+…

A: The percentage of M2+ and M3+ ions in this crystal has to be calculated,

Q: 1. Given the following data, calculate the lattice energy of aluminum oxide, Al2O3.  a.-13 272 kJ…

A: Answer: Note: data mentioned of the electron gain enthalpy of oxygen is wrong. First electron gain…

Q: what is the mass in grams fir the atoms within the unit cell of Tantalum with a z number of 2 and a…

A: Density is defined as mass of a substance present in per unit volume. Density=Massvolume Given,…

Q: Gallium has an orthorhombic structure, with an = 0.45258 nm, bo = 0.45186 nm, and Ar Co = 0.76570…

A: Given :

Q: A sample of an alkali metal that has a BCC unit cell is found to have a mass of 1.000 g and a volume…

A: Given : Mass of alkali metal = 1 g Volume of alkali metal = 1.0298 cm3 Volume of hydrogen = 539.29…

Q: 7.) A compound crystallizes with cations (A) in a face centered cubic (fcc) lattice with eight…

A: A unit cell is a repeating unit of a crystal lattice. The number of particles present in a unit cell…

Q: 1. Given the key below the unit cell, what is the empirical formula of the substance whose crystal…

A: The contribution of each atom at corner is 1/8, at the face centre is 1/2, and at the body centre is…

Q: How many total cations (A and B) and anions (X) are there in the unit cell below? = A = B = X

A:

Q: Carbon forms a number of allotropes, two of which are graphite and diamond. Silicon has a diamond…

A: Graphite is an allotrope of carbon which is made up of hexagonal carbon rings in which each carbon…

Q: The element titanium has hcp packing with a hexagonal unit cell. The volume of the unit cell is 3.53…

A: The density (d) of the unit cell is calculated as shown below where M is the molar mass of the…

Q: d. (131)

A:

Q: 12 Calculate the density of a metal (in g cm3 with two decimal places) that has the energy of…

A:

Q: Beryllium (Be) mineral is expressed by a chemical formula (3BeO - Al2O3 -6SiO2), and it is revealed…

A: Number of Chemical Formulas in a Unit Cell:  we use this formula-  Given :    Avogadro's number (N)…

Q: )Element calcium (Ca) crystallizes in a face-centered cubic(fcc) lattice.The radius of a Valium atom…

A: A Unit cell is the smallest repeating unit or portion of a crystal lattice. The crystal lattice is…

Q: What is the coordination number of the crystal structure shown below?

A: Here . Given crystal is face centred cubic lattice. (fcc)

Q: Suppose that a crystal lattice is composed of a structure where anions, X, occupy all o the corners…

A: Given,  a crystal lattice is composed of a structure where anions, X, occupy all of the corners in…

Q: In their book X-rays and crystal structures (which begins ‘It is now two years since Dr. Laue…

A: Bragg's equation gives a selection rule for the allowed and forbidden reflection from a crystal…

Q: Sketch the (110) plane in a bcc unit cell and give the positions of the atoms whose centers are…

A: For plane (110), represent movement in X, Y and Z direction, the direction is given by cartesian…

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 the chemical formula for the ionic compound whose unit cell is shown? (A and B are cations;…

A:

Q: What is the formula of a compound in which the element ‘Y’ form hep lattice and atoms of ‘X’ occupy…

A: In a unit cell, atoms are present at corner, faces and edges depending upon the type of unit cell.…

Q: 7. Sketch the [110] direction and (110) plane in a cubic unit cell. Is there any geometrical…

A: Miller indices are group of three numbers which indicates the orientation of a plane or set of…

Q: (atoms) Number of Spheres Per Unit Cell: Volume of Spheres Per Unit Cell: π ³. Number of sphere per…

A: There are mainly following type of unit cells , which have different numbers of atoms/Molecules and…

Q: Cesium chloride packs in a crystalline lattice (shown). The cesium ion is the darker sphere in the…

A: We have a lattice structure of caesium chloride, with chloride ions at the eight corners and caesium…

Q: Explain how the unit cell reflects the intensive properties of a material. Is the bulk material's…

A: As the name suggest unit cell is the smallest entity which when repeats represents bulk substance .…

Q: What is the formula of a compound in which the element Y forms ccp lattice and atoms of X occupy…

A: The unit cell is the smallest repeating unit which gives the formation of the crystal lattice. There…

Q: K12Si17 crystal includes some substitutional phosphorus impurities (Si replaced with P). The defect…

A: When one atom of Si is replaced by one atom of P, one excess electron per atom of phosphorous is…

Q: A compound of cadmium, tin, and phosphorus is used in the fabrication of some semiconductors. It…

A: Assume x be the number of phosphide ions present in the lattice. Hence, the number of tetrahedral…

Q: 1. For the HCP crystal structure, show that a) The volume of the unit cell is given by 6√3R²c. b)…

A: The HCP crystal lattice is shown as- The hexagonal closed structure has 2 lattice parameters,…

Q: The inorganic part of bone is made of CaF2, or fluorite. For CaF2, the unit cell is cubic, and the…

A: CaF2 has fcc lattice, hence Z=4 Given, At. mass Ca = 40.08 g/mole At. mass F = 19.00 g/mole…

Q: l crystallizes in a body–centered lattice with the unit cell measuring 4.58 A°…

A: The body-centered lattice has atoms present at each corner of cube and one atom at centre of…

Q: Deslattes et al. found the following values for a single crystal of very pure silicon at 25 °C: p =…

A: given, density (ρ) = 2.328992 gcm-3 edge length (a) = 543.1066 pm = 543.1066×10-10 cm atomic mass…

Q: 13. Copper has an atomic radius of 128 pm. Calculate the density of the hypothetical forms of…

A:

Q: K12Si17 crystal includes some substitutional phosphorus impurities (Si replaced with P). The defect…

A: Given information,   The defect concentration is 2.5 * 1019 P atoms per cm3.

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.