Chemistry

• explain why ionic compounds do not conduct electricity when solid. ions are not free to move
• what is a covalent bond?

  a bond between 2 non-metals that share electrons on the outer shell to create strong electrostatic forces of attraction
• what is an ionic bond?

  a bond between a metal and a non-metal held by strong electrostatic forces of attraction
• what is an ion?

  an atom that has gained or lost an electron which causes the atom to have a charge
• explain why ionic compounds conduct electricity when molten or dissolved. because the weak intermolecular forces have been broken so the electrons are delocalised so the ions can move freely
• an ionic compound has a high melting point because the ions are held together by strong electrostatic forces which reqire a lot of energy to overcome
• simple covalent structures have low melting and boiling points because the intermolecular forces are weak which requires little energy to overcome
• a metallic bond is a bond between 2 or more metals that have delocalised electrons. this bond has strong electrostatic forces of attraction between the cations and the delocalised electrons