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CGP GCSE Chem > Removing the Impurities: > Flashcards

Removing the Impurities: Flashcards

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1
Q

What is the main impurity?

A

Sand - still solid even at 1500°C and would tend to stay mixed in with the iron

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2
Q

What removes this?

A

Limestone

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3
Q

What is the limestone decomposed by and what into?

A

The heat into calcium oxide and CO2

CaCO3 —> CaCO + CO2

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4
Q

What does the calcium oxide then do?

A

Reacts with the sand to from calcium silicate, or slag, which is molten and can be tapped off
CaO + SiO2 —> CaSiO3 (molten slag)

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5
Q

What is the cooled slag and what is it used for?

A

Solid

  • road-building
  • fertiliser
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CGP GCSE Chem (233 decks)

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