Exploring Solids and Polymers

Name two types of solids.

• Metallic solids

• Liquid solids

• Crystalline solids, Amorphous solids

• Gaseous solids

Name three types of unit cells.

• Tetragonal, Cubic, Orthorhombic

• Monoclinic, Tetragonal, Orthorhombic

• Triclinic, Cubic, Tetragonal,

• Hexagonal, Cubic, Orthorhombic

Name two types of semiconductor dopings.

• p-type and s-type doping

• n-type and p-type doping

• n-type and q-type doping

• a-type and b-type doping

Calculate the atomic packing factor (efficiency) of Face-Centered Cubic (FCC).

• 0.60

• 0.85

• 0.50

• 0.74

Which of the following correctly describes the energy band gaps for conductors, semiconductors, and insulators?

• Conductors: Valence band only; Semiconductors: Valence band and conduction band overlap; Insulators: Small band gap.

• Conductors: Valence band and conduction band overlap; Semiconductors: Small band gap; Insulators: Large band gap.

• Conductors: Small band gap; Semiconductors: Large band gap; Insulators: No band gap.

• Conductors: Large band gap; Semiconductors: No band gap; Insulators: Valence band and conduction band overlap.

Differentiate between polymers and nanomaterials.

• Polymers and nanomaterials are both the same and have no distinct properties.

• Polymers are small molecules, whereas nanomaterials are large structures.

• Polymers are large molecules made of repeating units, while nanomaterials have dimensions in the nanoscale and exhibit unique properties.

• Polymers are always made of metals, while nanomaterials are organic compounds.

Name two categories of solids.

• Metallic solids

• Liquid solids

• Crystalline solids, Amorphous solids

• Gaseous solids

Calculate the density of a compound.

• Density = Mass - Volume

• Density = Mass / Volume

• Density = Mass + Volume

• Density = Volume / Mass

Name two forms of polymers.

• Biodegradable plastics

• Composite materials

• Metals

• Natural polymers, Synthetic polymers

Answer explanation

• Natural Polymers:

  • These are polymers that occur naturally and are found in living organisms. Examples include cellulose (in plants), proteins (such as collagen), and nucleic acids (like DNA).

• Synthetic Polymers:

  • These are man-made polymers created through chemical processes. Examples include plastics like polyethylene and polystyrene, as well as synthetic fibers like nylon and polyester.