Lesson 3.3.2.2
3.3.2.2 Modification of alkanes by cracking Quiz: AQA Chemistry, Unit 3
20 questions
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Lesson 3.3.2.2, Modification of alkanes by cracking: 20 multiple choice questions for the AQA Chemistry (7405), Unit 3: Organic chemistry, written with Revision Ninja.
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The 20 questions
-
Which specific bonds are broken during the cracking of alkanes?
- C–H bonds
- C=C bonds
- Hydrogen bonds
- C–C bonds
-
Which conditions are used during the thermal cracking of alkanes?
- Low pressure, temperature
- High pressure, temperature
- Low temperature, catalyst
- Zeolite catalyst, pressure
-
What catalyst is used in catalytic cracking?
- Platinum wire only
- Concentrated sulfuric acid
- Sodium hydroxide
- A zeolite
-
Which product is mainly formed by thermal cracking?
- Ionic salts
- Metals
- Alkenes
- Carboxylic acids
-
What are the main products obtained from catalytic cracking used for?
- Polymers
- Lubricants
- Motor fuels
- Synthetic dyes
-
Which of these equations represents cracking of decane?
- C10H22 -> C10H20 + H2 only
- C10H22 -> C8H18 + C2H4
- C10H22 + O2 -> CO2 + H2O
- C10H22 -> 2C5H12
-
What is the primary economic reason for cracking long-chain alkanes?
- Produces more lubricants
- Creates pure polymers
- Reduces atmospheric sulfur
- Matches demand for fuels
-
What high-demand product is thermal cracking mainly used to produce?
- Cycloalkanes
- Aromatic hydrocarbons
- Alkenes
- Hydrogen gas
-
Which product of catalytic cracking is an aromatic hydrocarbon?
- Ethanol
- Benzene
- Methane
- Ethene
-
What is the molecular formula of the alkene produced when C12H26 is cracked to give C8H18 and one alkene?
- C2H4
- C4H8
- C6H12
- C4H10
-
What catalyst is used in the catalytic cracking of alkanes?
- Platinum catalyst
- Iron catalyst
- Nickel catalyst
- Zeolite catalyst
-
Which product type is formed in high yield by thermal cracking?
- Cycloalkanes
- Aromatic hydrocarbons
- Branched alkanes
- Alkenes
-
Which compound is a common product of cracking that is used as a feedstock in the chemical industry?
- Sodium chloride
- Ethene
- Ethanoic acid
- Iron(III) oxide
-
What type of hydrocarbon molecules are broken down during cracking?
- Short-chain alkenes
- Cycloalkanes
- Aromatic rings
- Long-chain alkanes
-
What is the balanced equation for cracking C16H34 to give C8H18 and an alkene?
- C16H34 -> C8H16 + C8H20
- C16H34 -> C4H10 + C12H24
- C16H34 -> C8H18 + C8H18
- C16H34 -> C8H18 + C8H16
-
Which crude oil fractions are in surplus relative to market demand?
- Long-chain fractions
- Short-chain fractions
- Gaseous alkanes
- Petrol fraction
-
A refinery cracks C10H22 into C5H12 and an alkene. What is the alkene formula?
- C5H12
- C10H20
- C5H8
- C5H10
-
Why are alkenes produced by cracking useful as chemical feedstocks?
- High boiling point
- C=C bond reactivity
- Saturated structure
- Lack of polarity
-
What pressure conditions are used in catalytic cracking compared to thermal?
- Atmospheric pressure
- Vacuum pressure
- High pressure
- Slight pressure
-
Which process during alkane cracking causes the overall reaction to be endothermic?
- Breaking C-H bonds
- Breaking C-C bonds
- Forming C-H bonds
- Forming C-C bonds
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