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The blast furnace

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The blast furnace quiz on IGCSE level
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Resumen del Recurso

Pregunta 1

Pregunta
When air is blown into the blast furnace the coke burns and oxidises. What is this reaction? [blank_start]carbon + oxygen[blank_end] = [blank_start]carbon dioxide[blank_end]
Respuesta
  • carbon dioxide
  • carbon + oxygen
  • coke + oxygen
  • carbonmonoxide
  • iron
  • iron + carbon dioxide

Pregunta 2

Pregunta
Why is hot air blasted through the furnace?
Respuesta
  • The air contains oxygen. The oxygen allows the coke (carbon) to burn and form carbon dioxide. This reaction gives out heat, i.e., it is exothermic, so it heats up the furnace.
  • The air contains oxygen. The oxygen allows the iron ore to burn and form carbon dioxide. This reaction gives out heat, i.e., it is exothermic, so it heats up the furnace.
  • The air contains oxygen. The oxygen allows the limestone to burn and form carbon monoxide. This reaction gives out heat, i.e., it is exothermic, so it heats up the furnace.

Pregunta 3

Pregunta
What is dropped into the furnace?
Respuesta
  • Limestone
  • iron ore
  • coke
  • slag
  • copper
  • steel

Pregunta 4

Pregunta
What are the products of a carbon monoxide and iron oxide reaction?
Respuesta
  • iron and carbon dioxide
  • slag and molten iron
  • oxygen and carbon
  • carbon and iron
  • slag and carbon dioxide

Pregunta 5

Pregunta
Is iron a solid, liquid or a gas when it forms at 1500 degrees Celsius?
Respuesta
  • solid
  • liquid
  • gas

Pregunta 6

Pregunta
What is molten slag (impurities) used for?
Respuesta
  • slag isn't used for anything and must be disposed of when the reactions are complete
  • roads
  • airplanes
  • tools

Pregunta 7

Pregunta
In which order do the following reactions happen?
Respuesta
  • IRON FORMS then CARBON MONOXIDE FORMS then CARBON DIOXIDE FORMS
  • CARBON DIOXIDE FORMS then CARBON MONOXIDE FORMS then IRON FORMS
  • CARBON MONOXIDE FORMS then CARBON DIOXIDE FORMS then IRON FORMS
  • IRON FORMS then CARBON DIOXIDE FORMS then CARBON MONOXIDE FORMS
  • CARBON DIOXIDE FORMS then IRON FORMS then CARBON MONOXIDE FORMS
  • CARBON MONOXIDE FORMS then IRON FORMS then CARBON DIOXIDE FORMS

Pregunta 8

Pregunta
Carbon monoxide is the reducing agent used in the blast furnace. How is carbon monoxide produced in the furnace?
Respuesta
  • carbon dioxide gas reacts with coke
  • limestone and coke react
  • limestone and carbon dioxide gas react
  • coke reacts with oxygen

Pregunta 9

Pregunta
When an element is reduced it loses electrons in the reaction
Respuesta
  • True
  • False

Pregunta 10

Pregunta
limestone is a sedimentary rock
Respuesta
  • True
  • False

Pregunta 11

Pregunta
What are the advantages to using limestone?
Respuesta
  • bright white in colour
  • easy to mine
  • neutralises acid
  • environment friendly
  • easily disposed of
  • breaks down in water

Pregunta 12

Pregunta
Zone 3 - what is the main chemical reaction? [blank_start]Fe[blank_end]2[blank_start]O[blank_end]3(s) + [blank_start]C[blank_end]O(g) → [blank_start]Fe(s)[blank_end] + [blank_start]CO[blank_end]2(g)
Image:
93876285-7d82-450e-b971-78ff2aef3581.gif (image/gif)
Respuesta
  • Fe
  • O
  • C
  • Fe(s)
  • O(g)
  • C(s)
  • CO
  • FeO

Pregunta 13

Pregunta
Zone 2 - what is the main chemical reaction? [blank_start]CO[blank_end]2(g) + [blank_start]C[blank_end](s) → [blank_start]2CO[blank_end](g)
Image:
a82edb36-b57d-433e-b307-0bf9ca9bda70.gif (image/gif)
Respuesta
  • CO
  • FeO
  • ClO
  • C
  • 2CO
  • 2FeO
  • 2ClO

Pregunta 14

Pregunta
Zone 1 - what is the main chemical reaction? [blank_start]C[blank_end](s) + [blank_start]O2[blank_end](g) → [blank_start]CO2[blank_end](g)
Image:
7d9c5f6c-bcfe-447c-b330-f4c16ee64c21.gif (image/gif)
Respuesta
  • C
  • CO
  • Fe
  • O2
  • CO2
  • FeO2
  • ClO
  • Cl

Pregunta 15

Pregunta
Iron ore, limestone and [blank_start]coke[blank_end] are fed into the top of the furnace. Then [blank_start]hot air[blank_end] is blasted through the furnace. [blank_start]Oxygen[blank_end] in the hot air reacts with [blank_start]carbon[blank_end] to form [blank_start]carbon dioxide[blank_end] and then the carbon dioxide reacts with the coke to form [blank_start]carbon monoxide[blank_end]. This gas reacts with [blank_start]iron oxide[blank_end] changing it to [blank_start]iron[blank_end]. In the end the [blank_start]limestone[blank_end] reacts with the [blank_start]impurities[blank_end] to form [blank_start]slag[blank_end] which runs to the bottom of the furnace where it [blank_start]floats on top of[blank_end] the molten iron. During this process the [blank_start]molten iron[blank_end] runs to the bottom of the furnace where it is [blank_start]tapped off[blank_end].
Respuesta
  • coke
  • hot air
  • Oxygen
  • carbon
  • carbon dioxide
  • carbon monoxide
  • iron oxide
  • iron
  • limestone
  • impurities
  • slag
  • floats on top of
  • mixes with
  • molten iron
  • tapped off
  • separated from the slag

Pregunta 16

Pregunta
Then at high temperatures, carbon dioxide gas reacts with more coke and is therefore reduced. What is this reaction? [blank_start]carbon dioxide + carbon[blank_end] = [blank_start]carbonmonoxide[blank_end]
Respuesta
  • carbon dioxide + carbon
  • carbon dioxide + coke
  • oxygen + carbon
  • carbon + dioxide + coke
  • carbonmonoxide
  • carbon dioxide
  • reduction

Pregunta 17

Pregunta
How is carbon dioxide formed in a blast furnace? [blank_start]carbon + oxygen[blank_end] --> [blank_start]carbon dioxide[blank_end]
Respuesta
  • carbon + oxygen
  • oxygen + coke
  • oxygen + iron
  • carbon + dioxide
  • carbon dioxide

Pregunta 18

Pregunta
How is carbon monoxide formed in a blast furnace? [blank_start]carbon dioxide + iron oxide[blank_end] --> [blank_start]carbon monoxide[blank_end]
Respuesta
  • carbon dioxide + iron oxide
  • carbon + carbon dioxide
  • iron + carbon + oxygen
  • oxygen + carbon
  • carbon monoxide
  • carbon dioxide

Pregunta 19

Pregunta
How is iron formed in a blast furnace? [blank_start]carbon monoxide + iron oxide[blank_end] --> [blank_start]carbon dioxide + iron[blank_end]
Respuesta
  • carbon monoxide + iron oxide
  • iron + oxygen
  • iron oxide + carbon dioxide
  • carbon dioxide + iron
  • iron
  • oxygen + iron

Pregunta 20

Pregunta
Write out the fully balanced equation for the reaction that the resulting gas will have with iron. - When a number is placed after an element it is regarded as a subscript. Before an element it is regarded as a coefficient [blank_start]Fe[blank_end][blank_start]2[blank_end][blank_start]O[blank_end][blank_start]3[blank_end] + [blank_start]3[blank_end][blank_start]CO[blank_end] ---> [blank_start]2[blank_end][blank_start]Fe[blank_end] + [blank_start]3[blank_end][blank_start]CO[blank_end][blank_start]2[blank_end]
Respuesta
  • Fe
  • CO
  • O
  • Fe
  • 2
  • 3
  • 4
  • 3
  • 2
  • 4
  • 3
  • 2
  • 4
  • CO
  • C
  • O
  • Fe
  • 2
  • 3
  • 4
  • Fe
  • CO
  • O
  • C
  • 3
  • 2
  • 4
  • CO
  • C
  • O
  • Fe
  • 2
  • 3
  • 4

Pregunta 21

Pregunta
What was this reaction?
Respuesta
  • oxidation
  • reduction
  • redox
  • none of those
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