Lesson 4.7.1.4
4.7.1.4 Cracking and alkenes Quiz: AQA Chemistry, Unit 7
20 questions
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Lesson 4.7.1.4, Cracking and alkenes: 20 multiple choice questions for the AQA GCSE Chemistry (8462), Unit 7: Organic chemistry, written with Revision Ninja.
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The 20 questions
-
What are the two main methods of cracking?
- Thermal and fractional
- Steam and thermal
- Catalytic and fractional
- Catalytic and steam
-
What is the main purpose of cracking hydrocarbons?
- Forming longer chains
- Increasing viscosity
- Producing smaller molecules
- Removing impurities
-
Which two types of hydrocarbon are products of cracking?
- Alcohols and acids
- Polymers and proteins
- Metals and salts
- Alkanes and alkenes
-
What colour change shows an alkene when bromine water is added?
- Green to yellow
- Colourless to blue
- Orange to colourless
- Purple to red
-
Which homologous series is more reactive?
- Alkanes
- Polymers
- Alkenes
- Alcohols
-
Why is there a high demand for small hydrocarbon molecules?
- Used as solvents
- Used as fuels
- Used as catalysts
- Used as lubricants
-
What primary product category are alkenes used to manufacture?
- Esters
- Ceramics
- Polymers
- Glass
-
What are the conditions used in steam cracking?
- Low temperature
- Room temperature
- High temperature
- High pressure only
-
Cracking C8H18 gives C4H10 and one other product. What is the other product?
- C8H16
- C4H8
- C2H4
- C4H6
-
Cracking C10H22 gives C6H14 and one alkene. Which alkene balances the equation?
- C5H12
- C4H10
- C4H6
- C4H8
-
Which balanced equation shows cracking of C6H14 into C3H8 and an alkene?
- C6H14 -> C3H6 + C2H6
- C6H14 -> C3H8 + C2H4
- C6H14 -> C3H8 + C3H6
- C6H14 -> C3H8 + C3H8
-
What key component is used in catalytic cracking besides heat?
- Steam
- Oxygen
- Bromine
- A catalyst
-
Which substance decolourises bromine water during testing?
- Water
- An alkane
- An alkene
- Carbon dioxide
-
What are the two types of products formed by cracking?
- Alkenes and alcohols
- Alkanes and polymers
- Alkanes and alkenes
- Alcohols and alkanes
-
Cracking C12H26 gives C6H14 and one other product. What is the other product?
- C6H12
- C12H24
- C6H10
- C6H16
-
What economic benefit does cracking provide to the petroleum industry?
- Creates crude oil
- Removes all impurities
- Stops combustion
- Matches supply to demand
-
How do the products of cracking directly support modern lifestyle requirements?
- Forming solid metals
- Providing noble gases
- Generating raw minerals
- Supplying fuels and polymers
-
Cracking C10H22 gives C5H12 and X, where X is an alkene. What is X?
- C10H20
- C5H8
- C5H12
- C5H10
-
Which crude oil fractions are typically selected for cracking?
- Petrol fraction
- Heavier fractions
- Gases
- Refinery gases
-
Which reagent is used to distinguish between alkenes and alkanes?
- Limewater
- Universal indicator
- Hydrochloric acid
- Bromine water
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