Cracking Alkenes

Why do we crack long hydrocarbons?

• A.We like to put them in small packages

• B. To lower their boiling points to use as fuels

• C. To increase their boiling points to use as fuels

• D. To make them difficult to vaporise

Alkenes are…..

• A. Saturated hydrocarbons with double bonds 

• B. Unsaturated hydrocarbons with single bonds

• C. Unsaturated hydrocarbons with double bonds

• D. Chemicals that smell funny

What conditions are needed for Cracking to occur?

• A. High temperature and a Catalyst

• B. High temperature only

• C. Warm tropical climate and sandy beaches

• D. Low temperature and a catalyst

What type of reaction is catalytic cracking?

• A. Thermal

• B. A bad reaction

• C. Combustion

• D. Thermal Decomposition

This is a molecule of……

• A. 2 Alkanes

• B. Water only

• C. Ethene only

• D. Alkane + Alkene

C8H16  is an…

• A. Alkene 

• B. Aardvark

• C. Saturated Hydrocarbon

• D. Alkane

Bromine turns what colour when added to an Alkene ?

• A. Orange/Yellow

• B. Blue/Black

• C. Clear/Colourless

• D. Red/Green

What is the formula for an alkene in terms of n ?

• CnH2n+2

•  CnH2n

•   CnH3n

• CnH1/2n+2