Unit 1 Lesson 9

Question 1

Molecular solids properties:
1.Particle occupying lattice points
2.Bonds or intermolecular forces broken upon melting
3.Melting points
4.Factors affecting melting points
5.Hardness/flexibility
6.Other properties

Answer 1

1.Molecule
2.LDF
Dipole dipole
Hydrogen bond
3. Low
4. LDF increase with increased electrons
DD increase with increase in delta EN
5. Soft flexible waxy
6.non conductor

Question 2

Metallic solid property
1.Particle occupying lattice points
2.Bonds or intermolecular forces broken upon melting
3.Melting points
4.Factors affecting melting points
5.Hardness/flexibility
6. Conductivity

Answer 2

1.positive nuclei
2.metallic bonds (strong)
3. Moderate high
4. Melting point increases with number of valence electrons
5. Hardness varies very soft hard. Ductile malleable
6. Good conductors

Question 3

Ionic solids properties:
1.Particle occupying lattice points
2.Bonds or intermolecular forces broken upon melting
3.Melting points
4.Factors affecting melting points
5.Hardness/flexibility
6.conductivity

Answer 3

1.positive and negative ions
2. Ionic bonds hold by electrostatic attraction (very strong)
3.High
4. increases with increasing charge separation (varies based on ion size)
5.hard brittle
6. Conductor electricity when dissolved in water

Question 4

Network solids properties:
1.Particle occupying lattice points
2.Bonds or intermolecular forces broken upon melting
3.Melting points
4.Factors affecting melting points
5.Hardness/flexibility
6.conductivity

Answer 4

1. Atoms (usually carbon)
   2.Covalent bonds (strong)
   3.very high
   4.depends on structure
   5.Depends
   6.diamond insulator / graphite conductors