TSR Wiki > Study Help > Subjects and Revision > Revision Notes > Chemistry > Properties of covalent, ionic, giant and molecular compounds
| Type
| Structure
| State
| Forces between molecules
| Melting and boiling points
| Solubility in water
| Conducts electricity?
| Examples
|
| Covalent
| Molecular
| Liquids and Gases
| Weak
| Low
| Insoluble exceptions include HCl, Sugar, NH3
| No
| H2O, O2, CH4
|
| Ionic
| Giant lattice
| Solids
| Strong
| High
| Soluble
| When molten (melted) and when dissolved in water.
| CaO, NaCl, MgO
|
Properties of giant and molecular structures
Giant Structures
- Strong bonds throughout structure
- Unreactive
- High melting points because the strong covalent bonds extend throughout the compound
- Does not conduct electricity except graphite
- eg NaCl, MgO, diamond, SiO2 (silicon dioxide).
Molecular structures
- Strong bonds within the molecules but have weak bonds between therefore low melting points.
- Gases and liquids
- Unreactive
- eg H2, O2, CO2, ethanol C2H6
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