Chemical changes ( chem paper 1 topic 4 )

• What is the significance of oxidation and reduction in the reaction of metals with oxygen?

  They explain the changes in oxidation states during the reaction
• What is the general outcome when metals react with oxygen?

  • Formation of metal oxides
  • Example: Magnesium + Oxygen → Magnesium Oxide
• What is the reaction of magnesium with oxygen characterized by?

  A rapid release of heat and light
• How does iron react with oxygen compared to magnesium?

  Iron reacts more slowly, taking weeks or months
• What is formed when magnesium reacts with oxygen?

  Magnesium oxide
• What is formed when iron reacts with oxygen?

  Iron oxide
• What does gaining oxygen in a reaction signify?

  It is called an oxidation reaction
• In the reaction between magnesium and oxygen, what happens to magnesium?

  Magnesium is oxidized as it gains oxygen
• In the reaction between iron and oxygen, what happens to iron?

  Iron is oxidized as it gains oxygen
• What occurs during a reduction reaction?

  • Loss of oxygen from a compound
  • Example: Magnesium oxide → Magnesium + Oxygen
• What happens to magnesium oxide when it is split into magnesium and oxygen?

  Magnesium atoms are reduced as they lose oxygen
• In the reaction of calcium with copper oxide, which element is oxidized?

  Calcium is oxidized as it gains oxygen
• In the reaction of calcium with copper oxide, which element is reduced?

  Copper is reduced as it loses oxygen
• What are the key concepts of oxidation and reduction in metal reactions?

  • Oxidation: Gain of oxygen
  • Reduction: Loss of oxygen
  • Important for understanding metal reactions with oxygen