Weekly topic: 5 Wealth points for those who answer correctly, 2 Wealth points for participation； Question 141

“\"Non-stick\" cookware is made by applying a thin layer of polytetrafluoroethylene to the inner wall of a metal pot. Which of the following statements about polytetrafluoroethylene is correct? (B) A. The monomer of polytetrafluoroethylene does not contain carbon-carbon double bonds. B. Polytetrafluoroethylene burns easily at high temperatures. C. Polytetrafluoroethylene has very stable chemical properties and does not undergo any chemical changes under normal use. D. Polytetrafluoroethylene has many internal branches that are intertwined with each other, so it will not contaminate food

D. PTFE has many intramolecular branches that are intertwined with each other, so it does not contaminate food

“\"Non-stick\" cookware is made by applying a thin layer of polytetrafluoroethylene to the inner wall of a metal pot. Which of the following statements about polytetrafluoroethylene is correct? (C) A. The monomer of polytetrafluoroethylene does not contain carbon-carbon double bonds. B. Polytetrafluoroethylene burns easily at high temperatures. C. Polytetrafluoroethylene has very stable chemical properties and does not undergo any chemical changes under normal use. D. Polytetrafluoroethylene has many internal branches that are intertwined with each other, so it does not contaminate food

Which of the following statements about polytetrafluoroethylene is correct?

“\"Non-stick\" cookware is made by applying a thin layer of polytetrafluoroethylene to the inner wall of a metal pot. Among the following statements regarding polytetrafluoroethylene, the correct one is (C. Polytetrafluoroethylene has very stable chemical properties and does not undergo any chemical changes under normal use). Explanation: A. The monomer of polytetrafluoroethylene is tetrafluoroethylene, which contains carbon-carbon double bonds; therefore, option A is incorrect； B. “Non-stick” cookware is made by applying a thin layer of polytetrafluoroethylene to the inner wall of a metal pot, which shows that polytetrafluoroethylene remains stable at high temperatures; therefore, B is incorrect ； C. Polytetrafluoroethylene is commonly known as the \"king of plastics\"; it is resistant to acids and alkalis and does not readily undergo chemical reactions. Moreover, for reasons related to food safety, the material used to cover the inner surfaces of cooking utensils must not easily react chemically. Therefore, C is correct ； D. Tetrafluoroethylene has only one single bond; after addition polymerization, there are no other unsaturated bonds that can undergo cross-linking reactions, so there are no side chains. Therefore, D is incorrect

C. PTFE has very stable chemical properties and does not undergo any chemical changes under normal use

“A \"non-stick\" cooking pot is made by applying a thin layer of polytetrafluoroethylene to the inner wall of a metal pot. Which of the following statements about polytetrafluoroethylene is correct? (C) The monomer of polytetrafluoroethylene is tetrafluoroethylene, which contains carbon-carbon double bonds； Polytetrafluoroethylene is very stable at high temperatures ； Polytetrafluoroethylene has only one single bond and no branches

B. Polytetrafluoroethylene burns easily at high temperatures. C. Polytetrafluoroethylene has very stable chemical properties, and no chemical changes occur during normal use. D. Polytetrafluoroethylene contains many internal branches that are intertwined with each other, so it does not contaminate food

C. -----------------