Keywords + definitions

• What is oxidation?


  The reaction when oxygen is added to a substance
• What is reduction?


  The reaction when oxygen is removed from a substance
• An ore is a rock which contains enough metal to make it economically worthwhile to extract the metal.
• The reactivity series is a list of elements in order of their reactivity
• What is a displacement reaction?

  A reaction which a more reactive element takes the place of a less reactive element in one of its compounds or in solution.
• What is electrolysis?


  The breakdown of a substance containing ions by electricity
• Salt is a compound formed when some or all of the hydrogen in an acid is replaced by a metal
• A neutralisation reaction is the chemical reaction of an acid with a base in which a salt and water are formed
• Neutral - A solution with a PH of 7
• Acid - A solution that has a PH value less than 7
• The base is the oxide, hydroxide or carbonate of a metal that will react with an acid. It is insoluble
• Alkali - A soluble salt that when is solution has a pH greater than 7
• Whats a pH?


  A number which shows how strongly acidic or alkaline a solution is
• Anode - the positive electrode in electrolysis
• Cathode - The negative electrode in electrolysis
• What is an electrolyte?

  A liquid, containing free moving ions which is broken down by electricity in the process of electrolysis
• What is the order of the reactivity series from most to least reactive?

  Potassium, sodium, calcium, magnesium, aluminium, carbon, zinc, iron, tin ,lead, hydrogen, copper, silver, gold, platinum
• When metals react with other things the metal atoms becomes a positive ion. The reactivity is related to how easily it will form the ion. The more easily it will form the ion - the more reactive it is.