Chemistry

Chemistry, 19.09.2019 16:50, cdyshaylia55

Consider a hexagonal close-packed unit cell as shown here.

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Chemistry, 14.09.2019 06:30, arianna23717

Atom packing and density calculation [40 marks) (a) what are the main atom packing types, efficiency and coordination numbers in minerals? [5 marks) (b) two main types of atom packing with high efficiency are hexagonal close packing (hcp) and cubic close packed (ccp). [20 marks] (61) draw the atom packing models for the two types and show the atomic concentrations (atoms per unit volume) in each case. mark the atom positions on the models. (10 marks) (62) usir using trigonometric relationships in each of the two models of atom packing in (b1), calculate the volume for the two packed structures. [10 marks) full marks will awarded for showing the stepwise calculation, as in the examples shown in the class exercise. (c) density computation exercise (15 marks) hematite and magnetite are two main fe-oxides, and are composed of fe and o. hematite has hexagonal close packing (hcp) and magnetite has "cubic diamond type" packing, i.e. combining cubic close packed (ccp) and face centred cubic (fcc). (see example used in class). hematite crystallises in the hexagonal system with cell parameters: a = b = 5.038 a. c=13.772a, and angles a = b = 90°; and y = 1200. magnetite is cubic with a = b = = 8.397 a, a = b = y = 90°. given the atomic masses of fe and o as 55.845 g/mol, and 15.999 g/mol, respectively, calculate the density of hematite and magnetite. hints: use the following relationships for your density calculations. if mot is the atomic mass in the periodic table (given above for each element) then the mass of the atom (mat) in kg is: (1) mot = (10 kg/g)ma/na where na is avogadro's number na=6.023x102) atom/mol and density is: (2) p = (number of atoms per unit volume) (mass per atom).

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Chemistry, 14.09.2019 06:30, xxkeyxx51

(b) two main types of atom packing with high efficiency are hexagonal close packing (hcp) and cubic close packed (ccp). [20 marks] (61) draw the atom packing models for the two types and show the atomic concentrations (atoms per unit volume) in each case. mark the atom positions on the models. [10 marks] (62) using trigonometric relationships in each of the two models of atom packing in (b1), calculate the volume for the two packed structures. [10 marks]. full marks will awarded for showing the stepwise calculation, as in the examples shown in the class exercise. (c) density computation exercise (15 marks] hematite and magnetite are two main fe-oxides, and are composed of fe and o. hematite has hexagonal close packing (hcp) and magnetite has "cubic diamond type" packing, i.e., combining cubic close packed (ccp) and face centred cubic (fcc). (see example used in class). hematite crystallises in the hexagonal system with cell parameters: a = b = 5.038 a, c=13.772a, and angles a = b = 90°; and y = 1200. magnetite is cubic with a = b = = 8.397 a, a = b = y = 90° given the atomic masses of fe and o as 55.845 g/mol, and 15.999 g/mol, respectively, calculate the density of hematite and magnetite. hints: use the following relationships for your density calculations. if mat is the atomic mass in the periodic table (given above for each element) then the mass of the atom (mat) in kg is: (1) mat= (103 kg/g)mat/na where nais avogadro's number na=6.023x1023 atom/mol and density is: (2) p = (number of atoms per unit volume) (mass per atom).

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Chemistry, 14.09.2019 08:20, kalestalker10

(c) density computation exercise [15 marks] hematite and magnetite are two main fe-oxides, and are composed of fe and o. hematite has hexagonal close packing (hcp) and magnetite has "cubic diamond type" packing, i.e. combining cubic close packed (ccp) and face centred cubic (fcc). (see example used in class). hematite crystallises in the hexagonal system with cell parameters: a b 5.038 a c 13.772a, and angles a b 90°; and y 1200. magnetite is cubic with a b -c 8.397 a, a b y 90 given the atomic masses of fe and o as 55.845 g/mol, and 15.999 g/mol, respectively, calculate the density of hematite and magnetite hints: use the following relationships for your density calculations if mat is the atomic mass in the periodic table (given above for each element) then the mass of the atom (ma) in kg is: (1) mat (103 kg/g)ma/na where na is avogadro's number na=6.023x1023 atom/mol and density is: (2) p (number of atoms per unit volume) x (mass per atom)

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Physics, 28.09.2019 22:30, Derienw6586

With the aid of a diagram, show how atoms are packed on a face centred cubic lattice. identify the close-packed planes and state their miller indices. [3 marks] (b) the unit cell dimension of face-centred cubic copper is 0.36 nm. calculate the longest wavelength of x-rays that will produce diffraction from the close-packed planes. [3 marks] (c) an incoming x-ray beam given by 3.49x10 (3i +2k)m" is incident on a copper sample. write down the corresponding wave vector for an outgoing beam, diffracted by the close- packed plane from part (a). [4 marks] (d) stating any assumptions that you use, what is the radius of a copper atom? [2 marks] (e) explain why there is no diffraction from x-rays of 0.6 nm. [4 marks] (f) would you expect to see diffraction from nacl (unit cell lattice constant 0.56 nm) using x-rays of wavelength 0.8 nm?

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