Exam 6: Solids

Silicon dioxide exists as different polymorphs e.g. quartz and cristobalite. When silicon dioxide is melted and quenched (rapidly cooled), it forms an _______ structure known as a glass.

A semiconductor has which of the following properties? Please select all that apply.

Which of the following statements describe properties of metallic solids? Please select all that apply.

The structure with repeat sequence ABCCABCCABCCABC is close-packed.

The structure of C₆₀ is analogous to the stitching on a European football and is shown in the diagram below. Each carbon lies on the surface of a sphere and the carbon is sp³ hybridized?

A magnetic levitation train uses the Meissner effect to propel the train along magnetic rails. Which of these facts relating to superconductors are true. Please select all that apply.

Iron and cobalt both have similar low electronegativities. The predicted structure based on this information is an alloy.

What is the formula of a compound based on cubic close packing where one quarter of the tetrahedral holes (T) are filled in a lattice made of lattice points of type A. What is the coordination number of the filled holes and the lattice points? Please select all that apply.

Match the value of Born exponent with the appropriate compound. given that the Born exponent values for the individual ions are Be²⁺ = 5, F^- = 7, Zn²⁺, S^2- and Cl^- = 9, Rb⁺ = 10, Cs⁺ = 12 respectively. -RbCl

Lattice point counting for sphalerite shows that the structure contains ___ Zn/S ions.

Match the material with the bonding type. -platinum (Pt)

The ionic radius of an atom can be measured by X-ray diffraction.

Li₂O crystallises with the antifluorite structure where the positions of the cations and anions are in the opposite positions to the structure observed for fluorite. What are the coordination numbers of the lithium and oxygen ions?

A lattice point on the edge of a cubic unit cell is worth one quarter of a lattice point

-tungsten crystallises with a body centred cubic structure where the length of the unit cell is 3.150 Å. Use the diagram to calculate the radius of a tungsten atom. (Hint: The radius of the atom is just half the distance between the two closest atoms.)

A body centred cubic unit cell is close-packed.

Match the material with the bonding type. -S

The coordination number of iodine in cadmium iodide is six.

Match the value of Born exponent with the appropriate compound. given that the Born exponent values for the individual ions are Be²⁺ = 5, F^- = 7, Zn²⁺, S^2- and Cl^- = 9, Rb⁺ = 10, Cs⁺ = 12 respectively. -ZnS

A crystalline solid demonstrates long-range order which persists over distances much greater than the bond length between the atoms. It is possible to predict the position of every atom from those given in the unit cell.