Weekly topic: 5 Wealth points for those who answer correctly, 2 Wealth points for participation； Question 146
Thread Content
Multiple choice: Which of the following polymers, when burned in air, produces only CO2 and H2O? ( ) A. Gelatin (animal gelatin) B. Viscose fiber C. Neoprene D. Hair B. Viscose fiber
Which of the following polymers, when burned in air, produces only CO2 and H2O? (a)
Which of the following polymers, when burned in air, produces only CO2 and H2O? (B) A. Gelatin (animal gelatin) B. Viscose fiber C. Neoprene D. Hair
Which of the following polymers, when burned in air, produces only CO2 and H2O? (B) A. Gelatin (animal gelatin) B. Viscose fiber C. Neoprene D. Hair
A. White gelatin (animal glue). . . . . . . . . . . . . . . .
Among the following polymers, the one that burns in air to produce only CO2 and H2O is (B)
Among the following polymers, the one that produces only CO2 and H2O when burned in air is B
Answer: B. Analysis: A. White gelatin (animal gelatin) is a protein that contains nitrogen; therefore, its combustion products include not only CO2 and H2O, so A is incorrect ； B. Viscose fiber is made from plant fibers and contains only the elements C, H, and O; therefore, its combustion products consist solely of CO2 and H2O, so B is correct ； C. Neoprene contains chlorine, so in addition to CO2 and H2O, its combustion products also include HCl; therefore, C is incorrect ； D. Hair contains proteins, which contain nitrogen; therefore, the combustion products include not only CO2 and H2O, so D is incorrect.
Among the following polymers, the one that burns in air to produce only CO2 and H2O is (B. Viscose fiber). Explanation: A. Gelatin (an animal-derived protein) is a protein that contains nitrogen; therefore, its combustion products include not only CO2 and H2O, so option A is not correct； B. Viscose fiber is made from plant fibers and contains only the elements C, H, and O; therefore, its combustion products consist solely of CO2 and H2O, so B is the correct choice ； C. Neoprene contains chlorine, so in addition to CO2 and H2O, its combustion products also include HCl; therefore, C is not the correct choice ； D. Hair contains proteins, which contain nitrogen; therefore, the combustion products include not only CO2 and H2O, so D is not the correct choice ； Therefore, the answer is B
Among the following polymers, the one that burns in air to produce only CO2 and H2O is (B). Animal glue contains proteins, and hair also contains proteins as well as nitrogen; neoprene contains chlorine, so the answer is B