Concept explainers
(a)
Interpretation:
Coordination number of solid
Concept Introduction:
Radius ratio of smaller ion to larger ion in solid-state is used to represent relative size of larger ion. This radius ratio is used to predict structure of unit cell from crystal lattice as follows:
Expression to calculate radius ratio
(b)
Interpretation:
Coordination number of solid
Concept Introduction:
Refer to part (a).
(c)
Interpretation:
Coordination number of solid
Concept Introduction:
Refer to part (a).
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Chapter 3 Solutions
CHEMICAL PRINCIPLES (LL) W/ACCESS
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- (a) Draw an orthorhombic unit cell, and within that cell a (210) plane. (b) Draw a monoclinic unit cell, and within that cell a (002) plane.arrow_forwardAccount for the following :(a) Glass objects from ancient civilizations are found to become milky in appearance.(b) Window glass panes of old buildings are thicker at the bottom than at the top.arrow_forwardTable gives the ionic radii for K^+ and O^2- as 0.138 and 0.140nm, respectively.(a) What is the coordination number for each O^2- ion?(b) Brief y describe the resulting crystal structure for K2O.(c) Explain why this is called the antif uorite structurearrow_forward
- Sketch the band structure of a Li AND a Si crystal. (ii) How would you expect the electrical conductivity in Li AND Si crystals to vary with temperature? (iii) Account for the fact that the conductivity of Si is enhanced by the addition of small amounts of B.arrow_forwardHow will you distinguish between the following pairs of terms:(i) Tetrahedral and octahedral voids(ii) Crystal lattice and unit cellarrow_forwardDetermine the number of atoms per unit cell shown n= Zinc blende (cubic ZnS) n= 2 Cuarrow_forward
- The thermal and mechanical processing of materials is an important step in ensuring that they have the appropriate physical properties for their intended application. Suppose a metallic element undergoes a phase transit ion in which its crystal structure changes from cubic close-packed to bodycentredcubic. (a) Does it become more or less dense? (b) By what factor does its density change?arrow_forward(i) Write the type of magnetism observed when the magnetic moments are aligned in parallel and anti-parallel directions in unequal numbers.(ii) Which stoichiometric defect decreases the density of the crystal?arrow_forwardWhich type of intermolecular force accounts for each of these differences? (a) CH3OH boils at 65 °C; CH3SH boils at 6 °C. (b) Xe is a liquid at atmospheric pressure and 120 K, whereas Ar is a gas under the same conditions. (c) Kr, atomic weight 84 amu, boils at 120.9 K, whereas Cl2, molecular weight about 71 amu, boils at 238 K. (d) Acetone boils at 56 °C, whereas 2-methylpropane boils at -12 °C. CH3 CH3 O C CH3 CH3 CH3 CH Acetone 2-Methylpropanearrow_forward
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