U2.4: From Models to Material Flashcards
1
Q
Properties and bonding of Na2O, MgO2 and Al2O3
A
Properties:
- high mp/bp
- electrical conductors when molten
Bonding:
- ionic metallic oxides
2
Q
Properties and bonding of SiO2
A
Properties:
- high mp/bp
- non-conductors of electricity
Bonding:
- giant covalent oxide of metalloid silicon
3
Q
Properties and bonding of P4O10, SO2, Cl2O
A
Properties:
- low mp/bp
- non-conductors of electricity
Bonding:
- covalent non-metallic oxides
4
Q
Flaws of the bonding triangle
A
- If a binary compound containing a metal and non-metal (AlCl3 for example) is classified as ionic suggesting a higher melting point, the actual melting point of AlCl3 is much lower
- This is due to the significant covalent character which results in a low melting point
5
Q
Properties of metals
A
- high tendency to lose e-
- low tendency to attract e-
- thus, low EN values
6
Q
Properties of non-metals
A
- high tendency to gain e-
- thus, high EN values
7
Q
Types of elements in ionic bonds and their electronegativities?
A
- Metals: Low EN
- Non-metals: High EN
8
Q
Types of elements in metallic bonds and their electronegativities?
A
- Metals: Low EN
9
Q
Types of elements in covalent bonds and their electronegativities?
A
- Non-Metals: High EN
