C7: ALKENES Flashcards
What are the names of the first 4 alkenes?
-methene
-ethene
-propene
-butene
What is the general formula for alkene?
CnH2n
What are the molecular formulae of the first 4 alkenes?
-CH2
-C2H4
-C3H6
-C4H8
What are the 2 types of cracking?
-steam cracking
-catalytic cracking
What are the conditions required for steam cracking?
-Vaporise hydrocarbon
-mix with steam
-heat to high temprature
What are the conditions required for steam cracking?
-Vaporise hydorcarbon
-pass over hot powedered Aluminum oxid catalyst
Test for alkenes + result
-add bromine water
-colour change from orange to colourless
Why are alkenes very reactive?
C=C double bond which undergoes addition reactions
What is needed when an alkene reacts with hydrogen?
a nickel catalyst
What is needed when an alkene reacts with steam?
a phosphoric acid catalyst
How do Alkenes react with oxygen in combustion reactions?
tend to burn in air with smoky
flames because of incomplete combustion
What is the functional group?
c=c
Draw the product when ethene reacts with hydrogen.
ethan
Draw the product when ethene reacts with chlorine.
Draw the product when ethene
reacts with water.
