Weekly topic: 5 Wealth points for those who answer correctly, 2 Wealth points for participation； Question 142
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Multiple-choice: The outer material of the Olympic mascots Fuwa is pure wool yarn, while the inner filling is non-toxic polyester fiber. Which of the following statements is correct? ( ) A. Wool and polyester fiber have the same chemical composition. B. Both polyester fiber and wool can be hydrolyzed under certain conditions. C. Pure wool is a pure substance. D. Wool and polyester fiber cannot be distinguished by burning. Answer: B. Hint: The chemical composition of wool is protein, whereas that of polyester fiber is esters; therefore, option A is incorrect； Both wool and polyester fibers can be hydrolyzed under certain conditions; proteins are ultimately broken down into amino acids, while polyester fibers are converted into terephthalic acid and ethylene glycol. Option B is correct ； Since all polymer compounds are mixtures, option C is also incorrect ； Wool is composed of proteins, and it emits a smell of burnt feathers when burned, which allows for differentiation; therefore, option D is incorrect.
The outer material of the Olympic mascots Fuwa is pure wool yarn, while the inner filling is non-toxic polyester fiber. Which of the following statements is correct? (B) A. Wool and polyester fiber have the same chemical composition. B. Both polyester fiber and wool can be hydrolyzed under certain conditions. C. Pure wool is a pure substance. D. Wool and polyester fiber cannot be distinguished by burning
A. Wool and polyester fibers have the same chemical composition
The outer material of the Olympic mascots Fuwa is pure wool yarn, while the inner filling is non-toxic polyester fiber. Which of the following statements is correct? (C) A. Wool and polyester fiber have the same chemical composition. B. Both polyester fiber and wool can be hydrolyzed under certain conditions. C. Pure wool is a pure substance. D. Wool and polyester fiber cannot be distinguished by burning
The outer material of the Olympic mascots Fuwa is pure wool yarn, while the filling is non-toxic polyester fiber. Which of the following statements is correct? (B)
The outer material of the Olympic mascot Fuwa is pure wool yarn, while its inner filling is non-toxic polyester fiber; the correct statement among the following is b
The outer material of the Olympic mascots Fuwa is pure wool yarn, while the inner filling is non-toxic polyester fiber. Which of the following statements is correct? (B) Wool is a natural polymeric compound made of proteins, whereas polyester fiber is a synthetic material formed by the polymerization of monomers. Proteins can be hydrolyzed ； Proteins have a burnt taste, which can be detected
B. Both polyester fibers and wool can be hydrolyzed under certain conditions
B. Both polyester fibers and wool can be hydrolyzed under certain conditions
B. Polyester fibers and wool can both be hydrolyzed under certain conditions