WorksheetsGeneral principles and isolation of elements
Total questions: 25
Worksheet time: 15mins
What is an ore?
a solid metal
a rock containing a metal combined with other elements, often oxygen
an element
an object used to row a boat
Which element cannot be extracted from its ore by reduction with carbon?
iron
aluminium
copper
zinc
What is the name of the process that uses electricity to separate the elements in a compound?
reduction
electrolysis
extraction
mining
Many metals are extracted from their ores by heating them with carbon in huge furnaces. Which metal(s) cannot be extracted using this method?
Aluminum
Calcium
Zinc
Copper
in roasting , ore is heated in a ------------ in the presence of air
(a)
during roasting
volatile impurities are removed
moistures are removed
nonmetallic impurities are removed
pyrite is decomposed
smelting is done in ----------
(a)
copper obtained from bessemerization process is called-----------
(a)
purification of copper is done by
steam distillation
poling
gravity separation
electrorefining
in the electrorefining of Copper
pure copper is made anode
impure copper is made anode
anode and cathode are graphites
anode and cathode are iron
What is the ore of zinc called?
Bauxite
Hematite
Galena
Zinc blende
What is the correct reaction to form zinc oxide?
2ZnS + 3O2 --> 2ZnO + 2SO2
ZnS + 2O --> ZnO + SO
ZnS + O2 --> ZnO + SO2
2ZnS + 2O2 --> Zn2O + 2SO2
How is zinc separated from impurities?
Zinc has a lower boiling point so the impurities stay in solution when the zinc becomes a gas.
Zinc has a higher boiling point so the impurities become a gas while the zinc stays liquid.
Calcium oxide is added to make a salt with the impurities
In the extraction of aluminium, what compound of aluminium is used for the electrolyte?
aluminium oxide
aluminium sulfate
aluminium nitrate
aluminium sulfide
In aluminium extraction, the melting point of the electrolyte is lowered by adding (a)
Iron from the blast furnace is impure. To remove these impurities, .....
add additives to molten iron.
filter the molten iron.
blow oxygen into molten iron.
add coke to molten iron.
Stainless steel is made by adding additives such as .........
Select all correct options.
chromium
copper
molybdenum
titanium
nickel
Which is NOT a use of zinc?
Galvanizing
Sacrificial protection
Making brass
Making bronze
Which is NOT a use of aluminium?
as food containers
in aircraft bodies
as electricity cables
as insulators
