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Correct the wrong answers
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Correct the wrong answers
Correct the wrong answers
Name: 10. The neutral compound, 1,4-dimethoxybenzene is in a separatory funnel that also contains water and ether. How would you separate the 1,4-dimethoxybenzene? a. Drain out the ether layer, then filter the water layer. b. Add HCl, then basify the water layer with NaOH and filter the product. C. Add NaOH, then acidify the water layer with HCI and filter the product. Drain out the water layer, then evaporate the ether. A 11. After adding ImL concentrated sulfuric acid to Iml. ice cold hexene (C6H₁2) in a test tube and shaking the tube, what would you expect to observe? Separates into two distinct, colorless layers. b. Nothing happens in the tube. O The contents of the tube turn purple. d. Tube warms and there is a color change. D 12. How would the boiling point of water be effected if sand was added to the water? a. There would be an increase. b. There would be both an increase and a decrease. C. Impossible to tell without more information. d. There would be no effect. e. There would be a decrease.. A 13. The melting point of a pure sample of naphthalene should be: Higher than the melting point of an impure sample. Broader than the melting point of an impure sample. C. Lower than the melting point of an impure sample. d. Equal to the melting point of an impure sample. B 14. A student has two pure unknown liquids. The first liquid has a boiling point of 72.5 °C, and the second has a boiling point of 123 °C. Which of the following is most likely false? .. The two liquids can not possibly be the same substance. The first liquid will elute first from a gas chromatography column. C. The second liquid will primarily be collected first in a distillation. d. The boiling points of both liquids will be lower under reduced pressure. 15. In gas chromatography analysis of an unknown mixture, the area of the peaks on the chromatogram: (2) Can be used to calculate the mole percents of the components. b. Can not give any useable information for an unknown mixture. Can be used to directly identify the various components of the mixture. Can identify which component is more volatile. 3
Name: 10. The neutral compound, 1,4-dimethoxybenzene is in a separatory funnel that also contains water and ether. How would you separate the 1,4-dimethoxybenzene? a. Drain out the ether layer, then filter the water layer. b. Add HCl, then basify the water layer with NaOH and filter the product. C. Add NaOH, then acidify the water layer with HCI and filter the product. Drain out the water layer, then evaporate the ether. A 11. After adding ImL concentrated sulfuric acid to Iml. ice cold hexene (C6H₁2) in a test tube and shaking the tube, what would you expect to observe? Separates into two distinct, colorless layers. b. Nothing happens in the tube. O The contents of the tube turn purple. d. Tube warms and there is a color change. D 12. How would the boiling point of water be effected if sand was added to the water? a. There would be an increase. b. There would be both an increase and a decrease. C. Impossible to tell without more information. d. There would be no effect. e. There would be a decrease.. A 13. The melting point of a pure sample of naphthalene should be: Higher than the melting point of an impure sample. Broader than the melting point of an impure sample. C. Lower than the melting point of an impure sample. d. Equal to the melting point of an impure sample. B 14. A student has two pure unknown liquids. The first liquid has a boiling point of 72.5 °C, and the second has a boiling point of 123 °C. Which of the following is most likely false? .. The two liquids can not possibly be the same substance. The first liquid will elute first from a gas chromatography column. C. The second liquid will primarily be collected first in a distillation. d. The boiling points of both liquids will be lower under reduced pressure. 15. In gas chromatography analysis of an unknown mixture, the area of the peaks on the chromatogram: (2) Can be used to calculate the mole percents of the components. b. Can not give any useable information for an unknown mixture. Can be used to directly identify the various components of the mixture. Can identify which component is more volatile. 3
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