Alkenes and Ethanol Flashcards
What is the bond of an Alkene
Double CC
Are alkenes Unsaturated or Saturated
Why?
Unsaturated
The double C bonds can open up to make new bonds
What are the first 3 Alkenes
Ethene
Propene
What is the structure of Ethene
H H
C=C
H H
What is the structure of Propene
H H H
H C-C=C
H H
Explain the test for an alkene
Add substance to Bromine Water
The alkene will de colourise the bromine water taking it from orange to colourless
Explain why the test for Alkenes changes from Orange to colourless
Double bond has opened up and formed bonds with the Bromine
What is the formula for Ethene
C H
2 4
What is the formula for Propene
C H
3 6
What do we react Ethene with to get Ethanol
Steam
What is the process of turning Ethene to Ethanol
Hydration with Steam
Explain making Ethanol from Ethene
Hydrate Ethene with steam in the presence of a catalyst
What is an advantage of using the hydrating method to make ethanol
Cheap because Ethene’s cheap and not much is wasted
What is a disadvantage if using the hydrating method to make ethanol
Ethanol is produced from crude oil; this makes it non-renewable and so it will become expensive as resources start to run out
What is the alternative method to using hydration
Fermentation
What is the word equation for Fermentation
Sugar-> Carbon Dioxide + Ethanol
How does Fermentation work
Convert sugar into Ethanol using yeast
What do you need for fermentation
Lower Temperatures
Simpler Equipment
What are 2 advantages of using Fermentation
Renewable as sugar is grown in many parts of the world
Can be used as a cheaper fuel in countries that don’t have oil reserves for making petrol
What is a disadvantage of using Fermentation
Isn’t very concentrated so you still have to distil and purify it to increase its strength
What is the rule to find the formula of n Alkene
C H
n 2n
