Cracking and Hydrocarbons mid-topic review

What is a SATURATED hydrocarbon?

• a compound that only has double bonds between carbon atoms

• a compound that has no double bonds between carbon atoms

• a compound that does not contain any carbon atoms

• a compound that only has one double bond between carbon atoms

What is the general formula for the ALKANES?

• CnH2n

• CnHn

• C2nHn

• CnH2n+2

What happens in the process of CRACKING?

• long chain hydrocarbons are joined together to make even longer ones

• short chain hydrocarbons are joined together to make longer ones

• long chain hydrocarbons are broken into shorter ones

• long chain hydrocarbons are separated into fractions

What TYPE of reaction is cracking an example of?

• oxidation

• reduction

• thermal decomposition

• trick question - it s a physical change!

What is the general formula for ALKENES?

• CnH2n

• CnHn

• C2nHn

• CnH2n+2

Why is CRACKING useful?

• It produces short chain alkanes and alkenes, which are more useful than long alkanes

• It produces longer alkanes which are the most useful hydrocarbons

• It uses up the alkenes for which there is only a low demand

• There is a greater demand for long chain alkanes than can be met by crude oil only

What can be used to distinguish (tell the difference between) ALKANES and ALKENES?

• a flame

• limewater

• bromine water

• distilled water

What colour does bromine water turn in the presence of an ALKENE?

• it stays orange-red

• bright orange

• bright yellow

• it becomes colourless

Which of the following is an ALKENE?

• CH4

• C6H6

• C3H6

• C3H8

What is the correct name of the molecule with the formula C2H6?

• Ethane

• Ethene

• Propane

• Propene