Alkanes and cracking

Question 1

What are the two cracking types

Answer 1

catalytic and steam

Question 2

Why is cracking of hydrocarbons done

Answer 2

so long hydrocarbon molecules can be cracked to meet the demand of the more useful shorter hydrocarbons

Question 3

What does catalytic cracking involve

Answer 3

high temperature and catalyst

Question 4

What does steam cracking involve

Answer 4

very high temperature and steam

Question 5

What is the general rule for alkanes

Answer 5

C(n)H(2n+2)

Question 6

Methane formula

Answer 6

CH(4)

Question 7

Ethane formula

Answer 7

C(2)H(6)

Question 8

Propane

Answer 8

C(3)H(8)

Question 9

Butane

Answer 9

C(4)H(10)

Question 10

C(8)H(18) -> (cracking)

Answer 10

C(6)H(14) + C(2)H(4)

Question 11

What does thermal decomposition mean

Answer 11

heat breakdown

Question 12

How can we tell if a hydrocarbon is an alkane or an alkene

Answer 12

only alkenes decolourise bromine water

Question 13

Meth-

Answer 13

1

Question 14

Eth-

Answer 14

2

Question 15

Prop-

Answer 15

3

Question 16

But-

Answer 16

4

Question 17

Pent-

Answer 17

5

Question 18

Hex-

Answer 18

6

Question 19

Hept-

Answer 19

7

Question 20

Oct-

Answer 20

8

Question 21

Non-

Answer 21

9

Question 22

Dec-

Answer 22

10

Question 23

Stages in the breakdown of large hydrocarbon molecules

Answer 23

hydrocarbons are heated -> hydrocarbons vaporise -> hydrocarbon vapours passed over a hot catalyst -> hydrocarbons undergo thermal decomposition -> small hydrocarbon molecules are formed

Question 24

What bond do alkanes have

Answer 24

single covalent bond

Question 25

What bond do alkenes have

Answer 25

at least one double bond

Question 26

What is the general rule f