Graphite is an example of a three-dimensional network solid.
Which are properties of all metals?
Which statment is false?
Molecular solids are held together by covalent bonds
Elements most likely to be used for doping silicon in making semiconductors are
Ga, As, B
A diatomic element is a shiny purple solid at room temperature that sublimes upon gentle heating. It is slightly soluble in water and considerably more soluble in alcohol. It does not conduct electricity as a solid, liquid or solution. This solid can best be classified as
Which statement is false?
None of these choices are false
Which choice is an example of a metallic solid?
In an _____ semiconductor the charge carriers are the holes because _____.
Ultrapure silicon for use in the semiconductor industry can be obtained by the process of
According to band theory, a semiconductor is a material which has a(an) _____ valence band, a(an) _____ conduction band, and _____ between them.
partially filled; empty; a narrow gap
Three classifications of ceramics include those made from clay, called _____ ceramics; those made of alumina and magnesia, called _____ ceramics; and those made of nitrides and carbides, called _____ ceramics.
silicate; oxide; nonoxide
According to band theory, an insulator is a material which has a(an) _____ valence band, a(an) _____ conduction band, and a _____ gap between them.
partially filled; empty; wide
Which statement about optical fibers is false?
Optical fibers are worse than copper wire in the transmission of voice data, such as telephone conversations, because the fibers have more interference.
According to band theory, a good conductor is a material which has a(an) _____ valence band, a(an) _____ conduction band, and _____ between them.
partially filled; empty; no gap
is the resistance to flow.
is the energy that requires to form a flat surface.
is the rise of liquid through small diameter tube without an external force.
is the shape of the liquid surface when it is inside a small diameter tube.
is the tendency of a liquid to vaporize
P = Vapor pressure
R = Universal gas constant = 8.31 Jmol-1K-1
= Molar enthalpy of vaporization vapH
C = Clausius–Clapeyron Constant
is a large group of orbitals whose energies are closely spaced and whose average energy is the same as the energy of the corresponding orbital in an individual atom.
is a band containing the valence electrons.
contains high energy orbitals with an average energy above valance band.
has an excellent electrical conductivity.
do not conduct electricity.
offer zero resistance to electric conductivity.
can act as either conductor or insulator depending on the external electric field.
-Materials combining from the other three categories.
-Usually blend in a way that gives best of each component depending on the application.