C6.2.6

Question 1

Cracking:

Answer 1

Chemical reaction that converts large alkane molecules into smaller alkane molecules and alkene molecules

Question 2

Cracking of octane:

Answer 2

Octane → Hexane + Ethene

C₈H₁₈ → C₆H₁₄ + C₂H₄

Question 3

What does cracking involve?

Answer 3

Cracking involves heating oil fractions to high temperatures and passing them over a hot catalyst

Question 4

What catalysts are used in cracking?

Answer 4

Alumina or Silica

Question 5

What happens to covalent bonds under cracking conditions?

Answer 5

Covalent bonds between atoms in the large molecule break

Question 6

What temperature does cracking usually happen at?

Answer 6

600 ^oC- 700 ^oC

Question 7

What scale in cracking carried out on?

Answer 7

On a huge scale in refineries

Can be done on a small scale in the lab using pieces of broken pot as a catalyst