In the table below, identify the following items as being insulating, semiconduc
ID: 480523 • Letter: I
Question
In the table below, identify the following items as being insulating, semiconducting, or metallic in the electrical conductivity column. Identify the bonding in the material as being van der Waals, covalent, ionic, hydrogen, or metallic. For polymers, distinguish between bonding between fibers and within a fiber. Finally, rank the melting points of the following items from highest (1) to lowest (4).
Item Electrical Conductivity Type of Bonding Melting Point
Sodium chloride:
Gallium arsenide:
Magnesium metal:
Polyethylene H2O bottle:
Fill in the blanks with the appropriate words.
Explanation / Answer
Item
Electrical conductivity
Type of bonding
Melting point
Sodium Chloride
insulating
ionic
801 °C
Gallium Arsenide
Semi conducting
covalent
1238 °C
Magnesium metal
metallic
metallic
650 °C
Polyethylene H2O bottle
insulating
Vander waals
115-135 °C
Melting point is high for materials with 3D covalent bonding, followed by ionic, followed by metallic an then vanderwaals....as the above table depicts.
In case of polyethylene bonding between monomer units is covalent, where as bonding between individual polymer chains are vanderwaals.
Item
Electrical conductivity
Type of bonding
Melting point
Sodium Chloride
insulating
ionic
801 °C
Gallium Arsenide
Semi conducting
covalent
1238 °C
Magnesium metal
metallic
metallic
650 °C
Polyethylene H2O bottle
insulating
Vander waals
115-135 °C