At which temperature and pressure ethene is polymerized to polyethylene and polyurethane?
Correct answer: A. 200°C and 2000 atm
- A. 200°C and 2000 atm
- B. 500°C and 200 atm
- C. 400°C and 100 atm
- D. 400°C and 200 atm
Explanation
The correct conditions for polymerizing ethene to polyethylene involve a combination of high pressure and moderate temperature. Option A provides these conditions with 200°C and 2000 atm, which are typical for high-pressure polymerization processes. The high pressure is crucial to ensure the polymerization occurs efficiently as it facilitates the alignment of ethene molecules, leading to the formation of long polymer chains.Option B's temperature is excessively high, risking degradation rather than polymerization. Option C's pressure is too low for effective polymerization in a high-pressure process. Option D also presents a temperature that is not optimal for the desired polymerization, risking side reactions.
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Hydrocarbons are studied through the structures and reactions of alkanes, alkenes, alkynes and aromatic compounds. Coverage includes free radical substitution in alkanes, electrophilic addition to carbon-carbon multiple bonds, benzene substitution, aromatic stability and the difference between addition reactions of alkenes and substitution reactions of benzene.
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