electrolysis

• electrolysis is the

  breaking down of a compound using electricity

  
• aluminium is resistant to 


  corrosion

  
• aluminium has a low

  density

  
• Aluminium cannot be produced by reacting aluminium oxide with carbon. why?

  carbon is less reactive than aluminum

  
• Aluminium ions move to the negative electrode. Explain why

  opposites attract

  
• Why is hydrogen chloride a gas at room temperature (20 °C)?

  Hydrogen chloride is made of simple molecules.

  Hydrogen chloride has a low boiling point.

  
• Give 2 reasons why carbon is used to extract metals from their oxides

  it is cheap

  it is abundant

  
• State 2 metals that would react with dilute acid but not water.

  lead and zinc

  
• What is the concentration of H+ at pH 4 in mol/dm3 ?

  0.0004


  0.0001