a)
Interpretation:Errors in procedure that cause observed melting point of pure compound to be lower than correct melting point should be determined.
Concept introduction:Melting point is temperature that involves conversion of substance from solid to liquid state. Both liquid and solid phases are present in equilibrium with each other at this temperature.
b)
Interpretation:Errors in procedure that cause observed melting point of pure compound to be higher than correct melting point should be determined.
Concept introduction:Melting point is temperature that involves conversion of substance from solid to liquid state. Both liquid and solid phases are present in equilibrium with each other at this temperature.
c)
Interpretation:Errors in procedure that cause observed melting point of pure compound to be broad in range than correct melting point should be determined.
Concept introduction:Melting point is temperature that involves conversion of substance from solid to liquid state. Both liquid and solid phases are present in equilibrium with each other at this temperature.
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EBK EXPERIMENTAL ORGANIC CHEMISTRY: A M
- Brian forgot to close the end of his capillary tube when he was conducting the boiling point determination experiment. He then decided to use a lighter to close the end, making sure that it does not touch the oil. Which of the following statements is true? a. Brian did a great job in making sure that the experiment worked. It is important to close the end of the capillary tube for accurate determination of the lower limit of the sample's boiling point. b. What Brian did is dangerous as oil is a flammable substance. He should have stopped the experiment then closed the tube first before continuing. c. It is not important to close the end of the tube. He could have just proceeded with the experiment or covered the end of the tube with tape since prolonged air contact might contaminate the sample. d. Brian could have covered the end of the capillary tube with his finger, since it is not as dangerous as using the lighter on a flammable substance such as oil.…arrow_forward1. Name two different industrial/commercial applications for benzoic acid. 5. Why is it important that melting points are recording using a slow heating rate 6. Benzoic acid is a solid at room temperature. Suggest and describe two different types of intermolecular force that are responsible for its observed melting point.arrow_forwardWhat is the strongest attractive force present in the pure substances below? a.CH3CH₂CH3 b.CH₂Br2 C. CH3NH2 d.NaF wwwwwwwarrow_forward
- Answer the following (This is all about Phase Diagram of Water and Carbon Dioxide). A. Using the Venn Diagram differentiate the phase diagram of water from carbon dioxide. B. Give practical applications of phase diagram in the industry. C. Explain why expressing a concentration as "x-percent can be ambiguous?arrow_forwardWhy is it best to cool a solution slowly as a solid crystallizes? impurities are more likely to crystallize as well when done quickly the solid obtained will have a higher purity when done quickly no solid will form when done quickly the solvent could start to boil again when done quicklyarrow_forwardWhat is the relationship between vapor pressure at a temperature and its melting point so that sublimation can occur? What are the different phase changes involved in the purification using sublimation experiment?arrow_forward
- 13. Which molecule best disolves in water? Explain a. C2H6 b. CH3-O-CH3. c. CH3OH 14. Which molecule best disolves in hexane? Explain a. C2H6 b. CH3-O-CH3. c. CH3OH 15. Which molecule has the highest boiling point? Explain a. CH4 b. CH3F. c. CH3OHarrow_forwardDue to the fact that the liquid you used was a volatile one, it will not completely recondense. Some of the liquid remains in the vapor phase, even at room temperature. If you were able to correct for this by making the vapors recondense completely, would your final molar mass value be greater than, less than or the same as the value you determined? Explain your reasoning.arrow_forwardWhat effect does the presence of impurity have on the melting point?arrow_forward
- 3. A student is trying to identify an unknown solid based on its melting point. She noted that the compound began to melt at 172°C and finished melting at 177°C. Knowing it is possible for there to be impurities in the sample, is this compound more likely to be camphor or hydroquinone. Explain your reasoning. 4. A young chemist has synthesized what he believed to be acetaminophen. He measured the melting point of this newly formed compound to be 163-178°C. If the literature value for the melting point of acetaminophen = 169-170.5°C, would the young chemist be wise to consume this product for headache relief? Why or why not?arrow_forwardWhat is the strongest attractive force present in the pure substances below? a. CH3CH2CH3 b.CH3NH2 c. NaF wwwwwwww d.CH2CI2arrow_forwardIV. Arrange the following according to decreasing intermolecular force of attraction. Explain your answer. A. carbon tetrachloride B. water C. sodium chloride D. iodine-chloridearrow_forward
- EBK A SMALL SCALE APPROACH TO ORGANIC LChemistryISBN:9781305446021Author:LampmanPublisher:CENGAGE LEARNING - CONSIGNMENT