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15
×
The metals obtained after electro-refining are approximately
99% pure
95% pure
80% pure
90% pure
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15
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The process of removing impurities from ores to increase the percentage of metal is called
Calcination
Refining
Concentration
Reduction
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15
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The unwanted impurities in ores such as mud sand and rocks are called
Mineral
Alloy
Slag
Gangue
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banana
Go to last place!
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magnet
Take 10 points!
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rocket
Go to first place!
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baam
Lose 25 points!
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15
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Which method is used if the ore and impurities differ in density
Hydraulic washing
Froth floatation
Roasting
Magnetic separation
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lifesaver
Give 25 points!
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star
Double points!
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fairy
Take points!
5
10
15
20
25
×
baam
Lose 25 points!
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15
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If one substance is magnetic and the other is not which separation method is used
Distillation
Magnetic separation
Calcination
Froth floatation
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lifesaver
Give 10 points!
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seesaw
Swap points!
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gift
Win 20 points!
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baam
Lose 15 points!
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15
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Which refining method is used for metals with a low boiling point like mercury
Smelting
Distillation
Electro-refining
Calcination
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15
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Which of the following is converted into ZnO by roasting
FeâOâ
CaCOâ
NaCl
ZnS
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15
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Calcination converts carbonate ores into
Sulphides
Slags
Alloys
Oxides
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15
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The process of crushing ores into small particles using machines is called
Grinding
Roasting
Refining
Calcination
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seesaw
Swap points!
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gold
Win 50 points!
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shark
Other team loses 10 points!
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lifesaver
Give 25 points!
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15
×
Roasting converts sulphide ores into
Metals
Carbonates
Alloys
Oxides
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15
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In electro-refining the pure metal is connected to the
Ground
Anode
Both terminals
Cathode
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15
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Refining is done to
Convert ores into oxides
Remove remaining impurities from metals
Crush ores into powder
Extract ores from the earth
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