Weird Question in Chem paper 1! HELP

[MrKiller009]

Hey guys,
There is a weird question in chem paper 1 in http://www.xtremepapers.me/CIE/Cambridg ... _qp_12.pdf QUESTION NUMBER 29.. i just need an explanation that why "calcium" is used in making steel.. Never knew about it before to be honest.
thanks in advance!

 

[sweetiepie]

REASON FOR IT MIGHT HELP U.....

Calcium oxide is a basic oxide and reacts with acidic oxides such as silicon dioxide present in the rock. Calcium oxide reacts with silicon dioxide to give calcium silicate.

CAO+SIO2-->CASIO3

The calcium silicate melts and runs down through the furnace to form a layer on top of the molten iron. It can be tapped off from time to time as slag.

 

[sweetiepie]

READ HERE IF U STILL DINT GET IT...

http://www.chemguide.co.uk/inorganic/ex ... /iron.html

 

[MrKiller009]

oh thanks alot sweetiepie!

 

[sweetiepie]

ur welcum anything u want jux pm mee ...

 

[MrKiller009]

ur welcum anything u want jux pm mee ...

alright !

 

[sweetiepie]

yeah...