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6. Why do metals rust?

  • because it has been exposed to too much carbon dioxide
  • because the metal has lost oxygen (reduction)
  • because the metal is being oxidised (gain of oxygen)
  • because it has been exposed to too much water

7. How do indigestion tablets work?

  • Contain bases like calcium carbonate to neutralise stomach acid
  • Kills bacteria in stomach
  • Replaces excess stomach acid with hydrochloric acid in tablet

8. Which method would be used to extract iron from its metal ore?

  • heating with carbon
  • electrolysis

9. What is the name of a smart alloy used in glasses frames and to repair damaged blood vessels?

  • nitinol
  • steel
  • iron

10. Describe acids on the PH scale.

  • PH number 8-14. purple
  • PH number 0-6, purple
  • PH number 0-6, red
  • PH number 8-14, red

11. Metal carbonates give which products?

  • salt + hydroxide
  • salt + water + carbon dioxide
  • salt
  • salt + water

12. Why might metals be ideal for a saucepan base?

  • metals are good conductors of electricity
  • good conductors of heat
  • metals are malleable

13. What method would be used to extract magnesium?

  • electrolysis
  • heating with carbon

14. What are the properties of aluminium?

  • strong, hard, high melting point, conducts electricity
  • low density, corrosion resistant, forms strong alloys
  • shiny and easy to bend,unreactive

15. What is the test for chlorine?

  • bleaches damp litmus paper
  • relights a glowing splint
  • makes a squeaky pop with a lighted splint