Developing Fuels - ALKANES, CRACKING

Question 1

What is a Functional Group?

Answer 1

The part of the molecule responsible for that molecules chemical properties

Question 2

What does unsaturated mean?

Answer 2

Contains at least one C=C double bond

Question 3

What does saturated mean?

Answer 3

Contains only C-C single bonds

Question 4

What does Aromatic mean?

Answer 4

Compounds that contain a benzene ring

Question 5

What does Arene mean?

Answer 5

It is the name of aromatic hydrocarbon homologous series

Question 6

What does Aliphatic mean?

Answer 6

Compounds that do not have a benzene ring

Question 7

General formula for cycloalkanes?

Answer 7

CnH2n

Question 8

General formula for alkanes?

Answer 8

CnH2n+2

Question 9

What does cracking mean?

Answer 9

any reaction in which a larger molecule is made into smaller molecules using heat

Question 10

What colour is liquid pure bromine

Answer 10

red-brown

Question 11

what colour is bromine water

Answer 11

orange

Question 12

in the presence of an alkene, what would happen to bromine water?

Answer 12

solution would turn colourless

Question 13

in an alkane, what happens to bromine water visibly?

Answer 13

nothing, stays the same colour

Question 14

What is a catalyst?

Answer 14

a substance which speeds up the rate of a chemical reaction, but can be recovered chemically unchanged at the end

Question 15

what are the 4 stages of the model of heterogenous catalysis

Answer 15

1) Reactants adsorb onto the surface of the catalyst
2) Existing bonds weaken and break
3) New bonds form
4) Desorption

Question 16

when does heterogenous catalysis occur?

Answer 16

when the reactants and the catalyst are in different physical states

Question 17

How do catalyst poison molecules effect a catalyst?

Answer 17

They adsorb more strongly to the surface of a catalyst and block the active sites on the surface

Question 18

formula of a benzene ring?

Answer 18

C6H6