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Cracking And Alkenes (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Cracking And Alkenes' from the broader topic Organic Chemistry. The test is geared towards the AQA exam board style syllabus.
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What happens to the bromine water when an alkene is added?
Why are addition polymers like poly(ethene) difficult to dispose of?
Which test would show that a hydrocarbon contains a carbon–carbon double bond?
Which statement about alkenes compared with alkanes of the same carbon number is correct?
Which of the following is a typical use of short-chain alkenes produced by cracking?
What are the products when an alkene reacts with cold, dilute potassium permanganate (KMnO4)?
What is the IUPAC name of CH3–CH=CH–CH3 when the double bond is between the second and third carbon?
What happens to the physical shape of a polymer when it has many cross-links between chains?
Which pair of reagents will convert an alkene to a dihaloalkane in an electrophilic addition?
Which industrial feedstock is ethene mainly produced from?
Which structural feature best explains why alkenes can undergo addition reactions?