(3Q) Solids

Question 1

Atoms or molecules have no long range order. Glass, rubber, many
plastics

Answer 1

Amorphous solids

Question 2

Atoms or molecules are arranged in a well-ordered three dimensional array

Answer 2

Crystalline Solids

Question 3

are composed of huge number of small crystals with definite geometric shape that makes them RIGID and INCOMPRESSIBLE.

Answer 3

Crystalline Solids

Question 4

Why are Crystalline Solids considered true solids?

Answer 4

sharp melting point and definite heat of fusion

Question 5

basic repeating structural unit of crystalline solids

Answer 5

unit cell

Question 6

atoms or molecules are represented by each sphere and are identically arranged are called?

Answer 6

lattice point

Question 7

This unit cell has EQUAL edge lengths and angles, and the atoms are located at the corners of the cube and at the center of each face.

Answer 7

Cubic

Question 8

3 types of cubic unit cells

Answer 8

simple cubic, body-centered cubic, and face-centered cubic.

Question 9

This unit cell has TWO different edge lengths and EQUAL angles, with the atoms located at the corners of the parallelepiped.

Answer 9

Tetragonal

Question 10

This unit cell has THREE different edge lengths and EQUAL angles, with the atoms located at the corners of the parallelepiped.

Answer 10

Orthorhombic

Question 11

This unit cell has THREE different edge lengths and TWO different angles, with the atoms located at the corners of the parallelepiped

Answer 11

Monoclinic

Question 12

This unit cell has THREE different edge lengths and THREE different angles, with the atoms located at the corners of the parallelepiped

Answer 12

Triclinic

Question 13

This unit cell has EQUAL edge lengths and angles, but the parallelogram faces are not perpendicular to each other.

Answer 13

Rhombohedral

Question 14

This unit cell has EQUAL edge lengths and angles, but the atoms are located at the corners of a hexagon, and the top and bottom faces are hexagons as well

Answer 14

Hexagonal

Question 15

• Held together by weak IMFs
• Fairly low melting points

Answer 15

Molecular Solids

Question 16

• Held together by strong Coulombic forces (ionic bonds)
• Fairly high melting points

Answer 16

Ionic Solids

Question 17

• Held together by very weak dispersion forces
• Very lo melting points

Answer 17

Non Bonding Atomic Solids (solid noble gases

Question 18

• Held together by interaction of metal cation with electron sea
• Melting points vary

Answer 18

Metallic Atomic Solids

Question 19

• Held together by covalent bonds between composite units (may have weak IMFs within the structure)
• Very hi melting points
• Function giant molecules

Answer 19

ATOMIC SOLIDS

Question 20

composed of charged particles where the exact arrangement of ions in a lattice varies. Built electrostatic interaction is strong due to ions. Hard solid

Answer 20

Ionic Crystal

Question 21

held together by electrostatic force between cations and delocalized electrons. Good conductor of heat and electricity. Dense. Lustrous

Answer 21

Metallic Crystal

Question 22

lattice points are occupied by molecules and the attractive forces built between the molecules is LDF or Hydrogen bonding

Answer 22

Molecular Crystal

Question 23

Sulfur Dioxide (SO2), Iodine (I2), naphthalene (C10H8), Sugar

Answer 23

Molecular Crystal

Question 24

The atoms in this type of crystals are bonded covalently. Very high melting point. And because of the strength of the forces, poor conductor of electricity.

Answer 24

Covalent Crystal

Question 25

Chemical Nature of Amorphous

Answer 25

Isotropic

Question 26

Chemical Nature of Crystalline

Answer 26

Anisotropic