Deck 24: Materials Chemistry and Nanomaterials

Question 1

You want to prepare a framework solid fluoride containing a main group metal and a transition metal. Which method and starting materials would you use?

A) Direct synthesis starting from solid metal fluorides
B) Solution synthesis starting from metal fluorides.
C) Direct synthesis starting from a main group metal, fluorine and a transition metal fluoride.

Answer 1

B

Question 2

What drives the formation of defects in solids?

A) Favourable enthalpy of defect formation.
B) Favourable entropy of defect formation.
C) Low synthesis temperature.

Answer 2

B

Question 3

Identify the correct statement(s):
(i) Solid electrolytes with high anion mobility are less common than those with high cation mobility.
(ii) The need for better, more reliable batteries drives the study and development of new solid electrolytes.
(iii) The conductivity of cationic solid electrolyte is decreasing with increasing temperature.

A) (ii) and (iii)
B) (i) and (iii)
C) (i) and (ii)

Answer 3

C

Question 4

LaFeO₃ is an example of:

A) a complex oxide.
B) a metallic conductor oxide.
C) a binary oxide.

Question 5

The compounds with general formula ABX₃ frequently have:

A) spinel structure.
B) perovskite structure.
C) diamond structure.

Question 6

Common starting materials used as a source of nitride anion in the synthesis of complex metal nitrides are:

A) sodium azide and ammonia
B) nitrogen gas and a metal nitride
C) potassium nitride and a transition metal azide

Question 7

Which metals form layered sulfides?

A) Metals found on the left side of the d block.
B) Medals in the s block.
C) Metals located on the right of the d block.

Question 8

Which of the following properties must a good candidate for hydrogen storage material have:
(i) easy hydrogen release and uptake
(ii) a well-defined structure
(iii) a high mass percentage of hydrogen in its chemical composition.

A) (ii) and (iii)
B) (i) and (iii)
C) (i) and (ii).

Question 9

Two stages of solution-based nanoparticle synthesis are:

A) dissolution and precipitation
B) nucleation and growth
C) crystallization and recrystallization.

Question 10

Find the correct statement:

A) During chemisorbtion the bonds inside the reactant molecules are redistributed to make the products.
B) Only late, heavy d block metals are able to chemisorb small molecules.
C) Adsorption is an essential step in heterogeneous catalysis, but a strong adsorption can also prevent the catalytic activity.