4.1.2 Alkane properties

Question 1

general formula

Answer 1

CnH2n+2

Question 2

is it stable?

Answer 2

yes

Question 3

its reactivity is it high or low?

Answer 3

low

Question 4

is it saturated?

Answer 4

yes, only 1 covalent bonds

Question 5

what is a sigma bond and where is it?

Answer 5

this is a type of covalent bond formed between c-c and c-h

result of direct overlapping of s orbatils

Question 6

what shape are alkanes

Answer 6

• 4 sigma bonds so forms trigonal planar

- 109.5 degrees

Question 7

what is a london force

Answer 7

a weak intermolecular force between molecules

Question 8

what happens to the temperature (bp) as you increase the chain length and why?

Answer 8

as the length of the chain increases, the amount of london forces increase causing more energy to be needed to break them

Question 9

what happens to the temperature (bp) as you increase the amount of branches and why?

Answer 9

as the number of braches increases -> less surafce area -> so less points of contact are available -> so less london forces can be formed -> so less temp is required to break them