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Worksheetsquiz 5 iron element lesson 3 sec 3
Total questions: 24
Worksheet time: 2hrs 0mins
1. Which of the following substances conduct electricity in the solid state as well as in the molten state?
Alloys
metal oxides
Salts
Iron ores
Processes that aim to increase the percentage of iron in the ore
The crushing, the sintering
The concentrating, the crushing
The roasting, the concentrating
The sintering, the roasting
Dressing of ore aims to all the following except …
Decrease the ratio of impurities
Changing the physical properties of iron ore
Converting the different ore to red iron ore
Reduce hematite to iron metal
Iron ore is changed to hematite by …
Physical treatment
Roasting
Crushing
Reduction
The opposite figure shows balls of
Hematite ore resulting from crushing process
Magnetite ore resulting from sintering process
Limonite ore resulting from sintering process
Siderite ore resulting from crushing process
.... is produced during roasting
V2O5
CO2
SO2
O2
Brass and bronze are two decorative alloys that have been produced by man for thousands of years. Which period 4 transition metal do bronze and brass both contain?
copper
Cobalt
Zinc
Titanium
The ratio between atomic size of 2 elements used in substitutional alloy is …
1:2
1:3
1:1
1:4
Hematite is decreased by ... of limonite
4 Oxygen atom
hydrated water
2 hydrogen atoms
3 iron atoms
What is the chemical formula of pyrite ore?
FeCO3
FeS2
Fe2O3
Fe3O4
Increasing the percentage of carbon in steel it work on .....
Prevent the movement of layers and increasing ductility
Facilitate the movement of layers and decreasing ductility
Prevent the movement of layers and decreasing ductility
Facilitate the movement of layers and increasing ductility
When roasting siderite, the percentage of iron increase by …
40%
69.6%
25%
21.1%
Which is incorrect to describe production of steel
removal of impurities
adding of desired elements
removal of oxygen which combined with iron
forming an alloy
..... produces Pig iron
Electric furnace
Open furnaces
Oxygen converter
No correct answer
… always exist in the duer alumin alloy
Copper
Nickel
Chromium
Aluminum
Magnetite is one of the most important iron ores. What is its chemical formula?
Fe3O4
2Fe2O3.3H2O
Fe2O3
FCO3
FeO
Which of the following alloys does not contain copper?
Steel
Bronze
Brass
Duralumin
After iron the most abundance 3d element in earth’ crust is … configuration in atomic state
4s1 3d5
4s2 3d2
4s3 3d7
4s1 3d10
....... is added to iron to become harder than steel .
Scandium
Manganese
Copper
Cobalt
Coke: ....
reducing agent for hematite in blast furnace
oxidizing agent for impurities in midrex furnace
reducing agent for oxygen in blast furnace
source of reducing agent in midrex furnace
….. furnace has a closed gaseous cycle
Blast
Midrex
Oxygen convertor
Open
Blast & midrex furnaces are different in :
the aim of the furnace
chemical symbol of produced element
the iron ore used in each furnace
the name of reducing agent & its source
The hardness of pure metal can be increased by...
Heating and fast cooling
Converting it to alloy
Hammering and heating then rapid cooling
Heating strongly in air
The opposite graphical figure represents the approximate percentages of eight of the most abundant elements in earth’s crust, which of the following choices is correct?
Element (3) is the second abundant metal in the earth’s crust
The percentage of Sc in the earth’s crust is between (2) and (3)
Element (1) and (2) are oxygen and aluminum
Element (4) is iron
