Metals and Their Sources

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Questions and Answers

What is a characteristic of pure metals?

  • They are often found in nature as compounds
  • They are highly reactive
  • They are usually obtained through metallurgical processes
  • They are shiny and malleable (correct)

Which metals are often found in their native state?

  • Metals that are commonly used for extraction
  • Metals with low chemical reactivity, such as copper and gold (correct)
  • Alkali metals
  • Metals with high chemical reactivity

What is the primary objective of the concentration of ore process?

  • To refine the crude metal into a pure metal
  • To extract the crude metal from the ore
  • To mix the ore with other metals to form an alloy
  • To remove nonmetallic impurities and gangue from the ore (correct)

Which method of ore concentration is suitable for native ores such as gold and oxide ores?

<p>Gravity separation or Hydraulic wash (B)</p> Signup and view all the answers

What is the difference between a mineral and an ore?

<p>A mineral is a substance that contains a low percentage of metal, while an ore contains a high percentage (B)</p> Signup and view all the answers

What is the function of sodium ethyl xanthate in the froth flotation process?

<p>It acts as a collector, making the ore particles water repellent (B)</p> Signup and view all the answers

Why is bauxite considered an ore of aluminium, while china clay is not?

<p>Because aluminium can be commercially extracted from bauxite, but not from china clay (D)</p> Signup and view all the answers

What is the purpose of metallurgical processes?

<p>To extract a metal of interest from its ore (A)</p> Signup and view all the answers

What is the purpose of adding a depressant such as sodium cyanide in the froth flotation process?

<p>To selectively prevent other metal sulphides from coming to the froth (A)</p> Signup and view all the answers

What is hematite?

<p>A mineral that contains a high percentage of iron (B)</p> Signup and view all the answers

What is the characteristic of the ore that allows it to be separated from the gangue using the gravity separation method?

<p>Its high specific gravity (B)</p> Signup and view all the answers

What is the outcome of the froth flotation process?

<p>The ore particles rise to the surface with the froth, while the gangue particles settle at the bottom (A)</p> Signup and view all the answers

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