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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?

Gravity separation or Hydraulic wash (B) Signup and view all the answers

What is the difference between a mineral and an ore?

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

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

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

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

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

What is the purpose of metallurgical processes?

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

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

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

What is hematite?

A mineral that contains a high percentage of iron (B) 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?

Its high specific gravity (B) Signup and view all the answers

What is the outcome of the froth flotation process?

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