C7: ALKENES Flashcards
1
Q
What are the names of the first 4 alkenes?
A
-methene
-ethene
-propene
-butene
2
Q
What is the general formula for alkene?
A
CnH2n
3
Q
What are the molecular formulae of the first 4 alkenes?
A
-CH2
-C2H4
-C3H6
-C4H8
4
Q
What are the 2 types of cracking?
A
-steam cracking
-catalytic cracking
5
Q
What are the conditions required for cracking?
A
-high temp
-steam/catalyst present
6
Q
Test for alkenes + result
A
-add bromine water
-colour change from orange to colourless
7
Q
Why are alkenes very reactive?
A
C=C double bond which undergoes addition reactions
8
Q
What is needed when an alkene reacts with hydrogen?
A
a nickel catalyst
9
Q
What is needed when an alkene reacts with steam?
A
a phosphoric acid catalyst
