Weekly topic: 5 Wealth points for those who answer correctly, 2 Wealth points for participation； Question 137
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Multiple-choice: Since June 1, 2008, the production, sale, and use of plastic shopping bags have been restricted nationwide. Common plastic shopping bags fall into two categories: one of which has polyethylene as its main component； Another major component is polyvinyl chloride. Which of the following statements is correct? ( ) A. This measure helps to improve the environment and reduce white pollution. B. Using polyvinyl chloride plastic bags for storing food is better than using polyethylene bags. C. Polyvinyl chloride and polyethylene plastic bags have fixed melting and boiling points. D. Both polyvinyl chloride and polyethylene can undergo addition reactions with bromine water. Answer: A
A. This measure helps improve the environment and reduce white pollution.
Answer: A. This measure helps improve the environment and reduce white pollution.
Since June 1, 2008, the production, sale, and use of plastic shopping bags have been restricted nationwide. Common plastic shopping bags fall into two categories: one of which has polyethylene as its main component； Another major component is polyvinyl chloride. Which of the following statements is correct? (a) A. This measure helps to improve the environment and reduce white pollution. B. Using polyvinyl chloride plastic bags for storing food is better than using polyethylene bags. C. Polyvinyl chloride and polyethylene plastic bags have fixed melting and boiling points. D. Both polyvinyl chloride and polyethylene can undergo addition reactions with bromine water
A. This measure helps improve the environment and reduce white pollution
Since June 1, 2008, the production, sale, and use of plastic shopping bags have been restricted nationwide. Common plastic shopping bags fall into two categories: one of which has polyethylene as its main component； Another major component is polyvinyl chloride. Which of the following statements is correct? (A) A. This measure helps to improve the environment and reduce white pollution. B. Using polyvinyl chloride plastic bags for storing food is better than using polyethylene bags. C. Polyvinyl chloride and polyethylene plastic bags have fixed melting and boiling points. D. Both polyvinyl chloride and polyethylene can undergo addition reactions with bromine water
A. This measure helps improve the environment and reduce white pollution
Multiple-choice: Since June 1, 2008, the production, sale, and use of plastic shopping bags have been restricted nationwide. Common plastic shopping bags fall into two categories: one of which has polyethylene as its main component； Another major component is polyvinyl chloride. Which of the following statements is correct? (A) A. This measure helps to improve the environment and reduce white pollution. B. Using polyvinyl chloride plastic bags for storing food is better than using polyethylene bags. C. Polyvinyl chloride and polyethylene plastic bags have fixed melting and boiling points. D. Both polyvinyl chloride and polyethylene can undergo addition reactions with bromine water
Which of the following statements is correct? a
A. This measure helps improve the environment and reduce white pollution
Choose A; polyvinyl chloride is toxic and cannot be used as food packaging bags； Neither polyvinyl chloride nor polyethylene has a fixed melting or boiling point ； Polyethylene is formed when ethylene undergoes intermolecular addition polymerization (between two ethylene molecules), which converts the double bonds in ethylene into single bonds; as a result, it cannot react with bromine water