IGCSE CHEMISTRY 0620 LESSON 11 EXPLANATION

Lesson 11

9.5 Noble gases

• Describe the noble gases, in Group VIII or 0, as being unreactive, monoatomic gases and explain this in terms of electronic structure
• State the uses of the noble gases in providing an inert atmosphere, i.e. argon in lamps, helium for filling balloons

Metals

• ist the general physical properties of metals
• Describe the general chemical properties of metals, e.g. reaction with dilute acids and reaction with oxygen
• Explain in terms of their properties why alloys are used instead of pure metals
• Identify representations of alloys from diagrams of structure
  
  

  10.2 Reactivity series

  • Place in order of reactivity: potassium, sodium, •calcium, magnesium, zinc, iron, (hydrogen) and
  copper, by reference to the reactions, if any, of
  the metals with:

  Describe the reactivity series as related to the tendency of a metal to form its positive ion, illustrated by its reaction, if any, with:
  

  • –  the aqueous ions
  • –  the oxides
    of the other listed metals

  • –  water or steam
  • –  dilute hydrochloric acid
    and the reduction of their oxides with carbon

  • Deduce an order of reactivity from a given set of experimental results

  • Describe and explain the action of heat on the hydroxides, carbonates and nitrates of the listed metals
  • 
    
• Account for the apparent unreactivity of aluminium in terms of the oxide layer which adheres to the metal