Properties

• What should you be able to describe by the end of the video on ionic compounds?

  How ionic compounds form giant ionic lattices
• Why do ionic compounds have high melting and boiling points?

  Because of the strong electrostatic forces of attraction between the ions
• Why can't ionic compounds conduct electricity when solid?

  Because the ions are locked in place by strong electrostatic forces of attraction
• When can ionic compounds conduct electricity?

  When they are molten or dissolved in water
• What happens to sodium during its reaction with chlorine?

  One electron is transferred from the outer energy level of the sodium atom to the chlorine atom
• What charge does a sodium ion have after the reaction with chlorine?

  One positive charge
• What charge does a chloride ion have after the reaction with sodium?

  One negative charge
• What is the electronic structure of sodium and chloride ions after the reaction?

  Both have a full outer energy level, resembling a group zero noble gas
• What is the name of the compound formed from sodium and chlorine?

  Sodium chloride
• What is a giant ionic lattice?

  A structure where every positive ion is surrounded by negative ions and vice versa
• What are the forces of attraction in a giant ionic lattice called?

  Electrostatic forces of attraction
• How do ionic bonds act in a giant ionic lattice?

  They act in all directions
• Why do ionic compounds have high melting and boiling points?

  Because breaking the strong electrostatic forces of attraction requires a great deal of heat energy
• What is the melting point of sodium chloride?

  Around 800°C
• What happens to the particles of an ionic solid when it is heated?

  The particles vibrate, and when they gain enough energy, the electrostatic forces break and the solid melts
• What is the role of ions in conducting electricity in ionic compounds?

  The ions move and carry the electrical charge
• What is a common misconception about ionic compounds conducting electricity?

  That electrons are the ones moving to conduct electricity
• What are the key properties of ionic compounds?

  • High melting and boiling points due to strong electrostatic forces
  • Cannot conduct electricity when solid
  • Can conduct electricity when molten or dissolved in water
• How do the structures of ionic compounds influence their properties?

  • Giant ionic lattices with strong electrostatic forces lead to:
  • High melting and boiling points
  • Inability to conduct electricity in solid state
  • Ability to conduct electricity in molten or dissolved state