Structures - (CCEA)Physical properties of ionic compounds

Ionic bonding holds ions together in a giant lattice. Covalent bonds create simple molecules or giant covalent structures. Different types of bonding give a substance different properties – different melting and boiling points, different electrical conductivity, and different solubility in water, among much else.

Part ofCombined ScienceStructures, trends, chemical reactions, quantitative chemistry and analysis

Physical properties of ionic compounds

  • high melting and boiling points. Ionic solids have a high and because it takes a substantial amount of energy to break the strong that hold the ions together.
CompoundMelting PointBoiling Point
NaCl801°C1,413°C
MgO2,852°C3,600°C
CompoundNaCl
Melting Point801°C
Boiling Point1,413°C
CompoundMgO
Melting Point2,852°C
Boiling Point3,600°C

The ionic bonding between Mg2+ and O2- ions is stronger than between Na+ and Cl- ions

  • electrical conductivity. Ionic compounds electricity when molten or dissolved in water because the ions can move and carry charge.
  • water solubility. Most ionic compounds are soluble in water and form
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