Cracking and alkenes 4.7.1.3 & 4.7.2.1

Question 1

What is cracking?

Answer 1

Taking long-chain hydrocarbons molecules and “cracking” them into smaller, more useful molecules.

Alkanes —–> Alkanes + Alkenes
C12H26 —–> C8H18 + C4H8

Question 2

What is the product of cracking?

Answer 2

• Alkanes

- Alkenes

Question 3

What is meant by the term “saturated”?

Answer 3

the hydrocarbon is “full-up” of hydrogens

Question 4

What are Alkenes?

Answer 4

Alkenes are a homologues series which contain hydrogen and carbon, they all have a carbon DOUBLE bond (C=C) and are unsaturated.

Question 5

What are alkenes used for?

Answer 5

• to produce polymers

- starting materials for production of many other chemicals.

Question 6

what are short chained hydrocarbons used for?

Answer 6

• fuel

- making plastics

Question 7

what is the general formula of alkenes?

Answer 7

CnH2n

Question 8

what is the formula for ethene?

Answer 8

C2H4

Question 9

What is the formula for propene?

Answer 9

C3H6

Question 10

What is the formula for butene?

Answer 10

C4H8

Question 11

What is the formula for pentene?

Answer 11

C5H10