12.2 chemical reactions of alkanes Flashcards
1
Q
why do alkanes not react with most common reagents?
A
- sigma bonds are strong
- Alkanes are non- polar
2
Q
write the reaction of when ethane reacts completely in oxygen
A
C2H6(g) + 3.5O2(g) -> 2CO2(g) + 3H2O(l)
3
Q
what are the limitations of radical substitution
A
- further substitution
- reactions at different positions in a carbon chain.
4
Q
what are the 3 stages of radical substitution?
A
- initiation
- propagation
- termination
5
Q
what conditions are needed for alkanes to react with halogens
A
UV light
6
Q
how many stages are there in initiation?
A
1
7
Q
how many stages are there in propagation?
A
2
8
Q
how many stages are there in termination?
A
3
9
Q
write the 2 reactions of when heptane doesn’t completely react in oxygen
A
C7H16(l) + 7.5O2(g) -> CO(g)+ 8H2O(l)
C7H16(l) + 4O2(g) -> 7C(s) + 8H2O(l)
