POD 1 Flashcards
1
Q
what is THERMAL CRACKING?
A
- hydrocarbons heated in absence of oxygen
- 750-900C
2
Q
what is CATALYTIC CRACKING?
A
- hydrocarbons broken into positively charged fragments which recombine
- 500-600C
- zeolite porous which increases SA and decrease activation energy
3
Q
why is ETHENE USEFUL?
A
- electron rich double bond highly reactive
- readily transformed into many useful products
- monomer from which many polymers are made
4
Q
what is OXIDATION?
A
increased proportion of oxygen in compound
5
Q
what occurs in HALOGENATION?
A
halogen splits and adds across double bond
6
Q
what occurs in HYDROHALOGENATION?
A
hydrogen adds to one side and halogen adds to the other
7
Q
what is CRACKING?
A
breaking larger hydrocarbons into smaller ones
8
Q
what occurs in HYDRATION?
A
hydrogen adds to one side and hydroxide to the other
9
Q
what is an ADDITION POLYMER?
A
polymer formed through addition reaction between monomers
10
Q
describe the PROCESS of ADDITION POLYMERISATION?
A
- initiation
- initiator decomposed
with heat or light - pair of free radicals formed
- initiator decomposed
- activation
- monomers combine with radicals
to become activated
- monomers combine with radicals
- propagation
- activated monomers activate more
monomers - increase chain length
- activated monomers activate more
- termination
- radicals combine to from non-
activated species - lower temperature and pressure
- addition of inhibitor
- radicals combine to from non-
