Cracking and Alkenes Quiz

What is the main purpose of cracking in the petrochemical industry?

• To separate crude oil into its components

• To convert smaller hydrocarbons into larger ones

• To produce more crude oil

• To convert long alkanes into shorter, more useful hydrocarbons

Which of the following is a characteristic of alkenes?

• They are less reactive than alkanes

• They contain at least one C=C double bond

• They contain only single bonds

• They are saturated hydrocarbons

What is the general formula for alkanes?

• CnH2n+2

• CnH2n

• CnH2n-2

• CnH2n+1

What is the catalyst used in catalytic cracking?

• Platinum

• Copper

• Zeolite

• Iron oxide

What is the temperature used in steam cracking?

• 750 °C

• 850 °C

• 450 °C

• 550 °C

Which of the following is a product of cracking hexane?

• Octane

• Propane

• Methane

• Butane

What is the test for the presence of a C=C double bond in a molecule?

• Reaction with oxygen producing a flame

• Reaction with water producing a precipitate

• Reaction with sulfuric acid producing a gas

• Reaction with bromine water turning it colorless

What is the main reason for the importance of cracking?

• It reduces the cost of crude oil

• It increases the size of hydrocarbon molecules

• It helps match the supply of fractions with demand

• It produces more crude oil

Which of the following is a property of alkanes?

• They are unsaturated hydrocarbons

• They are more reactive than alkenes

• They contain at least one triple bond

• They are saturated hydrocarbons

What is the balanced symbol equation for cracking C16H34 to produce an alkane with 10 carbon atoms?

• C16H34 → C10H22 + C6H12

• C16H34 → C8H18 + C8H16

• C16H34 → C12H26 + C4H8

• C16H34 → C14H30 + C2H4