solids

Question 1

What are allotropes?

Answer 1

Different molecular structures of the same element

Question 2

What are metallic bonds?

Answer 2

High electron mass in metals resulting in a “sea” of electrons

Question 3

What are crystalline solids?

Answer 3

Solids with an ordered array of molecules

Question 4

What is the difference between square and close packing?

Answer 4

Square = grid arranged molecules
Close = zig-zag arranged molecules

Question 5

How are molecules arranged in a simple cubic cell (scc)?

Answer 5

one molecule in each corner

Question 6

How many molecules are in one scc?

Answer 6

one

Question 7

What is the edge length of an scc?

Answer 7

2r

Question 8

What is the packing efficiency of an scc?

Answer 8

52%

Question 9

How are molecules arranged in a body-centered cubic cell (bcc)?

Answer 9

One molecule in the middle, and one in each corner

Question 10

How many molecules are in one bcc?

Answer 10

two

Question 11

What is the edge length of a bcc

Answer 11

4r/√3

Question 12

What is the packing efficiency of a bcc?

Answer 12

68%

Question 13

How are molecules arranged in a face-centered cubic cell (fcc)?

Answer 13

one molecule on each face, and one in each corner

Question 14

How many molecules are in a fcc?

Answer 14

four

Question 15

What is the edge length of a fcc?

Answer 15

4r/√2

Question 16

What is the packing efficiency of a fcc?

Answer 16

74%

Question 17

What is an alloy?

Answer 17

A blend of metals

Question 18

What are holes?

Answer 18

Gaps within lattice poi

Question 19

What is a superconductor?

Answer 19

A material with no resistance to electrical flow

Question 20

What is a critical temperature (Tc)?

Answer 20

Temperature when a material becomes a superconductor

Question 21

What is x-ray diffraction?

Answer 21

A lab technique used to determine arrangement of atoms in a lattice