alkene

Question 1

pi bond

Answer 1

.electron density above and below atom
.no rotation

Question 2

sterioisomerism

Answer 2

.same strutucal but diff arrangement in space

Question 3

cis/trans

Answer 3

.cis = when same group is on the same side
.trans = when same group is on the oppo side

Question 4

E/Z

Answer 4

prioity = mass of atom not whole group

if same = add mass of the atoms bonded to it

Question 5

alkene shape

Answer 5

120 trigonal planer

Question 6

hydrogenation

Answer 6

alkene + H2 and Ni catalyst –> alkane

Question 7

alkene test

Answer 7

add bromine water and shake
= colourless

Question 8

alkene + H2O

Answer 8

conditions = steam and H3PO4

makes alcohol

Question 9

polymerisation

Answer 9

-[C-C]-n

Question 10

alkene + halogen mechanism (electrophillic addition)

Answer 10

Br-Br = top is slightly negative /bottom is positive

.arrow from C=C to Br positive
.arrow from Br-Br bond to negative Br

.alkane with a Br and a positive C
.Br- outside
.arrow from lone pair on Br- to C+

.forms dibromo alkene

Question 11

electrophile

Answer 11

electron pair acceptor

Question 12

addition of hydrogenhalide to alkene

Answer 12

.halogen on top and negative

.same as other mechanism but hydrogen goes first

Question 13

how to dispose of polymers

Answer 13

.crack the carbon chains to form many small alkenes and one new alkanes to make organic feedstock

.or burn them but HCl gas is bad