Sodium iodide forms a face-centered cubic unit cell with iodide atoms at the lattice points. If the ionic radii of the s
Posted: Mon Jul 11, 2022 1:17 pm
Sodium iodide forms a face-centered cubic unit cell with iodideatoms at the lattice points. If the ionic radii of the sodium andiodide ions are 98 and 220 pm, respectively, what is the density ofNaI?
a.
2.0 g/cm3
b.
3.9 g/cm3
c.
4.1 g/cm3
d.
14 g/cm3
e.
31 g/cm3
A composite material is one which
a.
is either plastic or brittle and does not conduct heat orelectricity.
b.
has a shiny surface and is a good conductor of heat andelectricity.
c.
occurs naturally and can be purified to use in manufacturingalloys.
d.
is brittle, nonmetallic, resistant to heat and chemicallyunreactive.
e.
combines properties of metals, polymers, and ceramics to performa specific function.
Which statement about metallic bonding is not correct?
a.
In the presence of an electrical field, the electrons migratetoward the positive charge.
b.
The valence electrons move freely around the nuclei, allowingconduction of electricity.
c.
The flexibility of metals results from the mobility of theelectron charge, which allows the nuclei to be moved withoutdisrupting the overall structure of the metal.
d.
It describes the freely moving valence electrons as an "electronsea."
e.
The metal nuclei behave as negatively charged ions.
a.
2.0 g/cm3
b.
3.9 g/cm3
c.
4.1 g/cm3
d.
14 g/cm3
e.
31 g/cm3
A composite material is one which
a.
is either plastic or brittle and does not conduct heat orelectricity.
b.
has a shiny surface and is a good conductor of heat andelectricity.
c.
occurs naturally and can be purified to use in manufacturingalloys.
d.
is brittle, nonmetallic, resistant to heat and chemicallyunreactive.
e.
combines properties of metals, polymers, and ceramics to performa specific function.
Which statement about metallic bonding is not correct?
a.
In the presence of an electrical field, the electrons migratetoward the positive charge.
b.
The valence electrons move freely around the nuclei, allowingconduction of electricity.
c.
The flexibility of metals results from the mobility of theelectron charge, which allows the nuclei to be moved withoutdisrupting the overall structure of the metal.
d.
It describes the freely moving valence electrons as an "electronsea."
e.
The metal nuclei behave as negatively charged ions.