10-minute Quiz : Chapter 59 Synthetic materials in modern life

Which of the organic substances is NOT likely to exhibit liquid crystalline behaviour?

• A
• B
• C
• D

The chemical structure of a compound is shown in the diagram. Which of the following statements concerning this compound is correct?

• A. It can exhibit liquid crystalline behaviour because it is polar.
• B. It can exhibit liquid crystalline behaviour because it is long and rod-like.
• C. It cannot exhibit liquid crystalline behaviour because it is ionic.
• D. It cannot exhibit liquid crystalline behaviour because it is a solid under room conditions.

The chemical structure of a liquid crystalline compound is shown in the diagram. Which of the following statements correctly suggest why this compound can exhibit liquid crystalline behaviour?

(1) Its molecules are long and rod-like.

(2) Its molecules are sensitive to temperature changes.

(3) Its molecules have a long alkyl chain.　

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only
• D. (1), (2) and (3)

The diagram shows the particle arrangements of three forms of matter: solid, liquid and liquid crystal.

(Note: only a single layer of particles is shown in the three forms of matter.)

Which of the combinations about the particle arrangements and the forms of matter is correct?

• A
• B
• C
• D

The diagram shows the change in molecular arrangement of a liquid crystal when an electric field is applied across it under certain conditions.

(Note: the directions at which only one of the molecules in each layer is considered here.)

Which of the following pieces of information about the molecular structure of this liquid crystal can be inferred from this phenomenon?

• A. Its molecules contain polar groups.
• B. Its molecules contain rigid structures.
• C. Its molecules are long and rod-like.
• D. Its molecules are chiral.

The diagram shows three different phases of liquid crystals. What is phase Z?

• A. Cholesteric phase
• B. Organic phase
• C. Smectic phase
• D. Nematic phase

What is the maximum particle size for nanomaterials?

• A. 1 nm
• B. 10 nm
• C. 100 nm
• D. 1000 nm

Which of the following kinds of nanoparticles is commonly used in making stained glass in architecture?

• A. Gold
• B. Iron
• C. Silver
• D. Copper

A carbon nanotube can be made by rolling up a graphene sheet. Which of the following properties do carbon nanotubes have?

(1) High mechanical strength

(2) High thermal conductivity

(3) High electrical conductivity

• A. (1) and (2) only
• B. (1) and (3) only
• C. (2) and (3) only
• D. (1), (2) and (3)

Which of the following properties is associated with the applications of nanomaterials in eliminating pollutants?

• A. High purity
• B. High malleability
• C. High antibacterial property
• D. High photochemical activity