Tuesday, May 24, 2011

5.13 I can describe catalytic cracking of long-chain hydrocarbons

Catalyst: a catalyst helps to speed up a reaction.


Why is a Catalyst used?


A catalyst is used to speed up a reaction, this is useful because with the catalyst you would be making the product faster, therefore sell it faster and get more money. 


Why are high temperatures needed?


High temperatures (between 600 - 700) degrees are needed to 'crack' the strong bonds of hydrocarbons into smaller chained hydrocarbons.







8 Questions about this video - Cracking Paraffin.


What does liquid Paraffin contain?
Liquid Parafin contains long chained hydrocarbons


What Happens when Liquid Paraffin gets Heated up?
The Liquid Paraffin made out of long chained hydrocarbons 'crack' into smaller chained hydrocarbons.


What is a catalyst and which one is used in the video?
A catalyst speeds up the process of a reaction and the catalyst used in the video is a ceramic catalyst ( a broken pot) which contains silica that is used to speed up the process. 


What important safety precautions are carried out in the experiment?
The gas will be collected under water, you should take out the delivery tube out of water to prevent suck back which can cause an explosion.


Why are the first bubbles that come out are not collected?
The First couple of bubbles that are made is due to the air expanding from the heat thus moving the air out.


 What is used to soak the liquid paraffin ?
Ceramic Wool


What is the process to distill crude oil called ?
Cracking


Why does Liquid Paraffin heated up?
To break the long chain bonds into smaller ones by heat.

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