Cracking

Question 1

What is the problem with long-chained hydrocarbons?

Answer 1

• Not very flamable meaning they are not good fuels.
• Short chained hydrocarbons are in high-demand for fuels.
• To solve this, we can break down longer-chained hydrocarbons into smaller chained.
• Cracking.

Question 2

What is produced in cracking?

Answer 2

• Shorter chained Alkane and an Alkene.

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Question 3

What are the 2 conditions for cracking?

Answer 3

• Catalytic cracking:
• Use high temperature and a catalyst.
• Speed up the reaction.

Steam Cracking:
- High Temperature and steam.
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Question 4

What is an Alkene?

Answer 4

• Ends in “ene”.
• Double Covalent bond between 2 carbon atoms.
• Very useful.
  CnH2n
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Question 5

How are alkenes useful?

Answer 5

• Used to make polymers.
• Used as a starting material for other useful chemicals.
• ## More reactive than alkanes.

Question 6

How do we test for Alkenes?

Answer 6

• Using bromine water (orange).
• ## If Alkene is present with bromine water it turns colourless.