From spec

• Describe the giant lattice structure of ionic compounds?

  A regular arrangement of alternating positive and negative ions.
• Describe the properties of ionic compounds?

  Ionic compounds have high melting and boiling points, high electrical conductivity (only in molten/dissolved state) and poor electrical conductivity in solid state - they are also often brittle.
• Why do ionic compounds have high melting and boiling points?

  Because there are strong electrostatic forces holding the oppositely charged ions together, these are very strong and require lots of energy to break.
• Why can ionic compounds conduct electricity in molten/dissolved state, but not solid?

  In molten or dissolved state, ionic compounds are able to conduct electricity due to the ions being able to move, and thus carry charge. Ions in solid state cannot move so cannot carry charge.
• How does the electrical conductivity of ionic compounds compare to covalent compounds?

  They both conduct electricity (sometimes) in moleten or dissolved state, but not in solid state.
• What are the two reactants in photosynthesis?

  Carbon dioxide and water
• What are two products in photynthesis?

  Glucose and oxygen