Cracking (Cognito Video)

What is crude oil primarily composed of?

• A mixture of hydrocarbons

• Pure carbon

• Water and minerals

• Single type of hydrocarbon

Which process is used to separate hydrocarbons in crude oil?

• Cracking

• Evaporation

• Fractional distillation

• Filtration

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

• To remove impurities from crude oil

• To convert hydrocarbons into water

• To break down long hydrocarbons into shorter ones

• To create longer hydrocarbon chains

What is the catalyst used in catalytic cracking?

• Aluminium oxide

• Silicon dioxide

• Magnesium oxide

• Iron oxide

In steam cracking, what is mixed with the vaporized hydrocarbons?

• Carbon dioxide

• Steam

• Nitrogen

• Oxygen

What could be products when cracking decane (C10H22)?

• Heptane (C7H16) and propene (C3H6)

• Hexane (C6H14) and butene (C4H8)

• Heptane (C7H16) and ethene (C2H4)

• Nonane (C9H20) and methane (CH4)

What is the formula for the unknown alkane when decane (C10H22) is cracked into ethene (C2H4)?

• C9H20

• C7H16

• C8H18

• C6H14

What is the structural difference between alkenes and alkanes?

• Alkenes have double bonds, alkanes have single bonds

• Alkenes have single bonds, alkanes have double bonds

• Alkenes have triple bonds, alkanes have single bonds

• Alkenes have single bonds, alkanes have triple bonds

What happens when bromine water is added to a solution of alkenes?

• It turns green

• It remains orange

• It turns blue

• It decolorizes from orange to colorless

Why are alkenes more reactive than alkanes?

• Because they have double bonds

• Because they are saturated

• Because they have single bonds

• Because they have more hydrogen atoms