2 Solid State

Question 1

What holds solids together? (5)

Answer 1

Van der Waals
covalent
coordinate
ionic
metallic

Question 2

Solids held together by Van der Waals have? (4)

Answer 2

Ex: I2
low MP
soluble in organic solvents (polar if dipole or h-bonded)
form non-ionic crystals

Question 3

Solids held together by covalent sources are? (3)

Answer 3

Ex) graphene, C, Si
- generally low electrical conductivity, electrical insulators
- high T/ mechanical forces needed to break bonds

Question 4

Solids held together by coordinate bonds are? (3)

Answer 4

ex) NH3BF3
- thermally stable
- break down in presence e donors or polar solvents

Question 5

Solids held together by Ionic bonds are: (5)

Answer 5

ex) NaCl
- high MP
- insulators in SS
- conductors in melt
- low impact resistance (break easily with small force)

Question 6

Solids held together by metallic bonds are: (8)

Answer 6

ex) Cu, Al
- highly conductive
- highly reflective
- high strength, malleability, ductility, impact resistance (generally)
- varying MP

Question 7

what is a metallic bond? (3)

Answer 7

-solids held together by mobile e
-valence e delocalized

Question 8

SS classification through bonding (3)

Answer 8

• Molecular (van der waals)
• network covalnet (covalent)
• ionic (ionic)

Question 9

SS classification by structure (2)

Answer 9

• Glasses
• Crystals