organic chemisry - cracking

Question 1

what binds do alkanes have?

Answer 1

sing covalent bonds between carbon atoms are fully

Question 2

why don’t long chain hydrocarbons make good fuels?

Answer 2

the bigger they are the less flammable they are

Question 3

what is there a high demand for?

Answer 3

short chain hydrocarbons to be used as fuels

Question 4

what happens during cracking?

Answer 4

a long chain alkane is broken down to produce smaller more useful molecules. (shorter chain alkanes) also another type of molecule formed (alkene)

Question 5

what are the two ways to carry out cracking?

Answer 5

catalytic or steam cracking

Question 6

what are the conditions for catalytic cracking?

Answer 6

very high temperatures and a catalyst. job of catalyst is to speed up the reaction

Question 7

what are the conditions of steam cracking?

Answer 7

high temp and steam

Question 8

what bonds do alkenes have?

Answer 8

double covalent bonds between carbon atoms

Question 9

why are alkenes very useful molecules?

Answer 9

• used to make chemicals called polymers
• starting material for other useful materials

Question 10

Alkenes are more ________ than alkanes

Answer 10

reactive

Question 11

how do we test for alkenes?

Answer 11

using bromine water which is orange. if we shake alkene with bromine water it will turn colourless.

Question 12

C25H52 -> C20H42 + C?H?

Answer 12

C5H10
(must have an equal number of atoms in each side)