Structure and Properties of Solids Flashcards
1
Q
4 main categories solids can be classified into
A
- Ionic solids
- Metallic solids
- Covalent molecular solids
- Covalent network solids
2
Q
Crystalline solids
A
Regular arrangement of atoms, ions, or molecules
3
Q
Amorphous Solids
A
No regular arrangement
4
Q
Ionic solids
A
- forms from metal and non-metal
- in crystal lattice structure
- alternating cations and anions
5
Q
Ionic solids physical properties
A
- Hard and brittle solid
- Dissolves in water
- Conducts electricity in solution
- high melting point
6
Q
How are metallic solids formed?
A
By closely packed atoms held together by electrostatic interactions and free floating electrons
7
Q
What is the electron sea theory?
A
- Positively charged nuclei remain fixed
- Electrons can flow between nuclei
8
Q
What does electron sea theory explain?
A
The low ionization energy of metals
9
Q
Properties of metallic solids
A
- Shiny/has lustre
- Malleable
- Electrical conductors
- Hard and strong
10
Q
Covalent Molecular Solid properties
A
- Low melting points
- Little hardness
- Electrical non-conductor (cuz its composed of neutral atoms)
11
Q
Covalent Network Structures
A
Bonds between atoms form an interwoven network
12
Q
What is an allotrope?
A
Different structures with the same element
13
Q
4 allotropes of carbon
A
- Graphite
- Diamond
- Buckyball
- Carbon Nanotubes
14
Q
Graphite properties
A
- Slippery
- Black
- Good conductors
- Hexagonal shape sheets
15
Q
Diamond Properties
A
- Extreme hardness
- very high melting point
- Not good conductors of electricity
