alkenes Flashcards
1
Q
what are alkenes
A
unsaturated hydrocarbons
2
Q
where do alkenes come from
A
cracking of alkanes from crude oil
3
Q
what are alkenes used to make
A
polymers (plastics)
4
Q
what does the term unsaturated mean
A
a molecule that contains a c=c bonds
5
Q
what is the general formula for an alkene
A
Cn H2n
6
Q
what kind of reaction is: ethene+chlorine = dichloroethane
A
addition reaction
7
Q
what happens in the test for alkenes
A
-alkane+ bromine water= remans orange, no reaction
-alkene+ bromine water= turns colourless
8
Q
what is meant by the term ‘addition polymers’
A
-the process of many small molecules (monomers) joining together to for a larger molecule (polymer)
9
Q
why is a polysterine cup used in calorimetry
A
-it is a good insulator and stops any heat exchange
