Understanding Cracking and Alkenes

What is the general formula for alkanes?

• CnH2n+2

• CnH2n

• CnH2n-2

• CnHn

What is the primary reason for the process of cracking?

• To increase the flammability of hydrocarbons

• To test the presence of alkenes

• To convert long chain hydrocarbons into shorter, more useful ones

• To create polymers from alkanes

What is the result of cracking a long chain hydrocarbon?

• A single longer chain alkene

• A single shorter chain alkane

• Shorter chain alkanes and possibly alkenes

• Only alkenes

What is the purpose of using a catalyst in catalytic cracking?

• To act as a reactant in the process

• To increase the size of hydrocarbon chains

• To decrease the reaction temperature

• To speed up the reaction

Which of the following is a condition for catalytic cracking?

• Room temperature and a catalyst

• Low temperature and high pressure

• High temperature and a catalyst

• High temperature and steam

What is steam cracking?

• Cracking that occurs naturally in the environment

• Cracking that uses a catalyst and water

• Cracking that uses low temperatures and high pressure

• Cracking that uses high temperature and steam

What distinguishes alkenes from alkanes?

• Alkenes have triple covalent bonds between carbon atoms

• Alkenes have a general formula of CnH2n+2

• Alkenes have single covalent bonds between carbon atoms

• Alkenes have at least one double covalent bond between carbon atoms

What are alkenes used for?

• As a catalyst in cracking

• To increase the length of hydrocarbon chains

• To make polymers and other chemicals

• As fuels in their pure form

What happens to bromine water when it reacts with an alkene?

• It turns colorless

• It turns blue

• It remains orange

• It turns pink

How do you determine the products in a cracking equation?

• By only considering the carbon atoms

• By guessing the possible products

• By adding more hydrogen atoms to the products

• By ensuring the number of carbon and hydrogen atoms is the same on both sides