1
Created by Boundless
The structure of an ionic crystal is:
A
an amorphous solid and tend to be soft and have low
melting points.
B
an amorphous solid and tend to be hard and have high
melting points.
C
a crystal lattice and tend to be hard and have high melting
points.
D
crystal lattice and tend to be soft and have low melting
points.
2
Created by Boundless
Lattice energy is:
A
absorbed when two ions join and is the sum of all the
interactions within in the crystal.
B
absorbed when two ions join and breaks apart the
interactions within in the crystal.
C
released when two ions join and is the sum of all the
interactions within in the crystal.
D
released when two ions join and breaks apart the
interactions within in the crystal.
3
Created by Boundless
Ionic crystals have the following properties.
A
Made up of neutral molecules
B
None of the answers
C
Amorphous
D
Long range order
4
Created by Boundless
Why don't covalent solids conduct electricity?
A
Because there are de-localized electrons.
B
Because covalent bonds are extremely strong.
C
Because there are no de-localized electrons.
D
Because the bonds are hard to rearrange.
5
Created by Boundless
Larger molecular crystals are less volatile and have higher melting points because:
6
A
Their ionic bonds decrease with the larger number of
atoms.
B
Their ionic bonds increase with the larger number of atoms.
C
Their dispersion forces decrease with the larger number of
atoms.
D
Their dispersion forces increase with the larger number of
atoms.
Created by Boundless
Metallic crystals are held together by:
A
electrostatic interactions between anions and delocalized
electrons.
B
van der waals forces.
C
electrostatic interactions between cations and delocalized
electrons.
D
covalent bonds.
7
Created by Boundless
Why, in general, are metals denser than nonmetals?
A
The more delocalized electrons, the looser the bonds and
the more loosely packed crystal lattice.
B
The less delocalized electrons, the tighter the bonds and
the more loosely packed crystal lattice.
C
The more delocalized electrons, the tighter the bonds and
the more tightly packed crystal lattice.
D
The less delocalized electrons, the tighter the bonds and
the more tightly packed crystal lattice.