Ionic bonding and ionic compoundsEdexcel A-Level Chemistry: Mind map

Exam questions on Ionic bonding and ionic compounds

1. Magnesium oxide is used to line industrial furnaces because it stays solid at temperatures above 2800 °C. Sodium chloride, by comparison, melts at about 800 °C. Both compounds are solids made of giant ionic lattices.
   Explain why magnesium oxide has a much higher melting temperature than sodium chloride.2 marks
2. A chemist is studying the ions N³⁻, O²⁻, F⁻, Na⁺, Mg²⁺ and Al³⁺. All of these ions have the electronic configuration 1s²2s²2p⁶.
   Explain why the ionic radius decreases from N³⁻ to Al³⁺.2 marks
3. A student places a drop of aqueous copper(II) chromate(VI) at the centre of a strip of damp filter paper connected to a 20 V direct current supply. After several minutes a blue colour has moved towards the negative electrode and a yellow colour has moved towards the positive electrode.
   Explain what these observations show about the particles in copper(II) chromate(VI).3 marks