extraction examples

• Extraction of mercury from mercuric oxide

  A) bunsen burner

  B) mercuric oxide

  C) glowing splint to test for oxygen gas

  
• Extraction by heating with carbon/carbon monoxide stage 1

  A) copper carbonate

  B) bunsen burner

  C) retort stand

  
• Extraction by heating with carbon/carbon monoxide stage 2

  A) burnt stick

  B) copper oxide

  C) strong heat

  D) pieces of copper

  
• The test for carbon dioxide gas is that the limewater turns milky
• Coke is a form of coal which has a very high percentage of carbon and provides the carbon for the extraction.
• Hot air is fed into the bottom of the blast furnace and moves upwards. The coke reacts with oxygen in the air to produce carbon dioxide.
• The temperature of the blast furnace is kept above the melting point of iron and so the pure iron is produced in the molten state.
• Iron in the blast furnace

  A) iron ore, coke, and limestone

  B) hot air

  C) molten iron and impurities

  
• extraction methods based on reactivity

  A) electrolysis

  B) heat with carbon or carbon monoxide

  C) heat alone

  D) native metals

  
• extraction by electrolysis

  A) Positive ions gain electrons at the negative electrode

  B) negative ions lose electrons at the positive electrode

  C) orange copper metal forms

  D) bleached blue litimus paper to test for chlorine gas

  E) chlorine gas from copper chloride