6.17 Separating metals from their ores

How is gold separated from its mixture?

• Evaporation

• Distillation

• Panning

• Filtration

Panning works on a mixture of substances with different ................................

• melting point

• boiling point

• densities

• solubility

During panning of a mixture of sand and gold....................................................

• gold escapes over the edge of the pan because its more denser than quartz.

• gold falls to the bottom of the pan because its more denser than quartz..

• gold escapes over the edge of the pan because its less denser than quartz.

• gold falls to the bottom of the pan because its less denser than quartz..

What is the main reason why it is not easy to extract a metal from its ore?

(more than one answer)

• Not enough ores

• Lack of technology

• Much energy is needed

• Many stages involved

What is the main compound tin exists naturally as in tin ore?

• Tin Chloride

• Tin Oxide

• Tin Sulfide

• Tin Carbonate

• Tin dioxide

Which country is the top producer of tin?

• Australia

• South America

• Indonesia

• China

How many grams of tin is extracted from 1 ton of riverbed ores that contain 0.015%.

• 150 kg

• 0.015 kg

• 0.15 kg

• 15 kg

How many grams of ore waste is produced from 1 kg of riverbed ores that contain 0.015%.

• 0.15 g

• 150 g

• 999.85 g

• 850 g

• 985 g

The top country in terms of producing tin.

• China

• Venezuela

• Brazil

• USA

• UK

The second top country in terms of producing tin.

• China

• Venezuela

• Brazil

• USA

• Indonesia