AET Crystals

The atomic packing factor (APF) is:

• the packing efficiency in a crystal structure

• the number of atoms in a unit cell

• the volume of atoms in a unit cell

Some solutions were refrigerated during crystal growth. Why?

• to slow the growth rate

• to avoid nucleation

• to precipitate more solid crystals

• to enhance supersaturation

Valid cubic structures are:

• bcc

• pcc

• lcps

• hcp

• fcc

The side of a unit cell may be referenced by:

• (110)

• (010)

• (101)

• (111)

In a crystal, all atoms or ions are arranged in _________________

• an amorphous blob

• by size

• by color

• a regular pattern

An invalid crystal type is:

• Monoclinic

• Triclinic

• Hexagonal

• Cubic

• Octagonal

Diamonds and graphite are both made from:

• C

• S

• N

• Si

Diamonds are incredibly hard substances because:

• They have high boiling points

• They are made from metal

• They have strong IMF's

• They are expensive

Diamonds form covalent bonds in a lattice structure called:

• lcps

• fcc

• bcb

• CCC

Geodes: (check all that apply)

• begin as a bubble

• require intense heat to form

• may take thousands or millions of years to form

• can have crystalline precipitates in them