chem topic 3

• neutralisation reactions


  acid + base -> salt + water
• what are alkalis?


  soluble bases
• reactions of acids

  acid + metal carbonate -> salt + water + carbon dioxide

  acid + metal oxide -> salt + water

  acid + metal hydroxide -> salt + water
• the more reactive the metal, the faster bubbles of hydrogen will be produced in metal reactions
• reactions of metals


  metal + oxygen -> metal oxide

  metal + acid -> salt + hydrogen

  metal + water -> metal hydroxide + hydrogen
• what is a displacement reaction?

  when a more reactive element displaces a less reactive metal from a compound
• what is a redox reaction and give one example

  where one substance in a reaction is reduced and another is oxidised, metal-acid reactions are redox reactions
• oxidation


  gain of oxygen and loss of electrons
• reduction


  gain of elecrons and loss of oxygen