A crystalline solid of an unknown origin forms an aqueous solution that conducts an electrical current. The solid has a high melting point and shatters when struck with a hammer. The solid is likely to be
An ionic bond
A covalent network solid
A metallic solid
A molecular solid
What is the edge length of a face-centered cubic unit cell made up of atoms having a radius of 200 pm?
20 pm
71 pm
566 pm
110 pm
What is the hybridization of carbon found in the allotrope of graphite?
sp
sp2
sp3
sp4
Cubic closest-packing
has a body-centered cubic cell
has the same unit cell as a hexagonal closest-packing
has a simple cubic unit cell
has a face-centered cubic unit cell
Dry ice (solid CO2) is which type of solid?
covalent atomic solid
ionic solid
metallic atomic solid
nonbonding atomic solid
molecular solid
The phase diagram of a substance is shown. What is the physical phase of the substance at T = 100 K and P = 0.1 atm?
gas
liquid
solid
supercritical fluid
A certain mineral, M_xM'_yA_z, crystallizes in the cubic unit cell shown below in which gray spheres represent cations M, shaded spheres represent cations M', and black spheres represent anions. How many anions are in the unit cell? How many cations M are int he unit cell? What is the empirical formula of the mineral?
Which type of spherical packing has the most unused space?
Body-centered cubic
cubic closest-packed
simple cubic
cubic closest-packed and hexagonal closest-packed
Identify the type of solid for gold.
Metallic atomic gold
Ionic solid
networking atomic solid
An ionic compound crystallizes in a unit cell having a face-centered cubic array with metal ions, Mn+, and all the tetrahedral holes (inside near corners) occupied by anions, X-. The empirical formula of this ionic compound is
MX
M7X4
M2X
MX2
Identify the type of solid for AgCl.
Metallic atomic solid
The temperature at which the solid, liquid, and gaseous phase are all in equilibrium is known as the
triple point
meting point
critical point
boiling point
Identify the type of interaction between atoms in a networking atomic solid.
hydrogen bonding
weak dispersion forces
polar bonding
covalent bonding
ionic bonding
Use the diagram to answer the following question. Melting occurs along the
orange to the blue line
green to the blue line
blue to the green line
orange to the green line
What terminology best describes the bonding in the following schematic of a metal?
crystal model
electron-sea model
Identify the packing in the figure shown below
body-centered cubic
cubic closest packed (face-centered cubic)
hexagonal closest packed
The normal boiling point of this substance is approximately
140 degrees celsius
25 degrees celsius
300 degrees celsius
350 degrees celsius
The 2 types of solids are known as
Amorphous solid
Ionic solids
Crystalline solid
Liquid crystal solids
Crystalline solids have no ordered arrangement.
Examples of an amorphous solid which has no ordered arrangement are
Glass
Rubber
NaCl
Polymers
❌ = Particles are ions. Regularly 3-D array. Hard, brittle, high melting point. Only conduct electricity in a molten state or dissolved in water.
❌ = atoms are linked together by covalent bonds throughout the entire crystal.
❌ = Pure metals (atoms) large array of atoms where positive nuclei are held together by electrons. "Sea of electrons."
❌ = particles are molecules. Held together by intermolecular forces. Soft6er, lower melting point and do not conduct electricity in any form.
Which of the following is the most efficient in packing?
Simple cubic
Body center
Face center
Match the edge length formula to the correct unit cell Simple cubic = ❌ Body center cubic =❌ Face center = ❌
Octahedral holes are the holes on edges and center of the face center cubic.
What is the coordination number for a simple cubic packing?
8
6
12
4
What is the coordination number for body-centered packing?
This packing method has 2 alternating layers and touches 12 neighbors.
Simple
Body-centered
Hexagonal
Cubic closest
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