Alkenes Flashcards
1
Q
What kind of bond does an alkene have?
A
A double carbon bond
C == C
2
Q
Why are alkenes unsaturated?
A
They can make more bonds - the double bond can open up, allowing the 2 carbon atoms to bond with other atoms
3
Q
What is the general formula for alkenes?
A
CₙH₂ₙ
4
Q
What are the first 2 alkenes?
A
Ethene (2 carbons) and Propene (3 carbons)
5
Q
What is the formula and structure of ethene?
A
C₂H₄
H H
> C == C <
H H
p55
6
Q
What is the formula and structure of Propene?
A
C₃H₆
H H H
H--C -- C == C <
H H
p55
7
Q
How do you test for an alkene?
A
1) Adding the substance to bromine water
2) An alkene will decolourise the bromine water, turning it from orange to colourless
8
Q
Why do alkenes decolourise bromine water?
A
The double bond has opened up and formed bonds with the bromine
