A sample of naphthalene is contamined with a small amount of anthracene. The melting point would be about the sample as the pure sample O higher and the range broader than the pure sample lower and the range more narrow than the pure sample lower and the range broader than the pure sample O higher and the range more narrow than the pure sample
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- In chromatography, the compound that is least soluble in the mobile phase a) Travels the furthest away from the line of origin b) Stays closest to the line of originWhat are the different melting point apparatus that are available for routine analysis? Describe each.Describe the errors which may cause an observed melting point range of a PURE sample to be: higher than the correct melting point broad in range
- 15 g of unknown organic sample was dissolve in 575 mL of Dicloromethane (DCM). The boiling point of benzene was increased by 3.40oC. Determine the molecular weight of the unknown sample? Kb of DCM = 2.42oC/m Bb of benzene = 39.6 oC density of benzene = 1.33 g/mL at 25 °Cin fractional distillation, how do you tell which liquid is in which fraction and which fraction has a mix of liquids if you are trying to seperate cyclohexane and toluene?? what would the density and boiling point of the first fraction be………… is usually used only to separate liquids whose boiling points differ greatly or to separate liquids from involatile solids or oils. which option is correct?a. distillation b. simple distillation c. fractional distillationd. steam distillation e. vacuum distillation
- During the distillation of the Bromobenzene and water mixture which fraction is richer in Bromobenzene: a) First fraction b) Second fraction c) The last fraction d) All fractions have the same compositionA student attempts to determine the molecular weight of an unknown liquid with aboiling point of 79.6°C, using the method of lowering the boiling point.naphthalene freeze. Explain why you were unable to determine its molecular weight.The melting point (mp) range of reference compound A is 320-340°C. The mp range of a 1:1 mixture of a sample of A with a sample of unknown compound B is found to be 140-300°C. Do the samples consist of identical compounds? A)Yes, because the mp of the mixture is lower than the mp of pure A. B) Not enough information is given to answer the question C) Yes, because they melt over a broad range. D) No, because the mp of the mixture is lower than the melting point of pure A.
- 12 g of unknown organic sample was dissolve in 706 mL of Dicloromethane (DCM). The boiling point of benzene was increased by 2.72oC. Determine the molecular weight of the unknown sample? Kb of DCM = 2.42oC/m Bb of benzene = 39.6 oC density of benzene = 1.33 g/mL at 25 °C Round your answer to the nearest whole number, no units required.1. An organic student did an experiment extracting benzoic acid from a mixture of other organic substances. Other analyses of the obtained sample confirmed the presence of benzoic acid. The student also measured the melting point of the white solid, 117.4-121.6 oC. The literature mp of benzoic acid is 122.3oC. What can you conclude about the sample? Select one. Group of answer choices The sample of benzoic acid contains soluble impurities. The student obtained a good yield of benzoic acid. The sample of benzoic acid contains insoluble impurities. The student obtained pure benzoic acid from the extraction. The student obtained a poor yield of benzoic acid. 2. Which phenomenon are sometimes confused with melting during mp analysis? Select all that apply. Group of answer choices decomposition cracking shaking sagging/shrinking sweating solidifying 3. Study the bond types in the compound shown. Select the type(s) of intramolecular force(s) you predict the substance to exhibit. Select all…Determine ΔT (T1 – T2), where T1 is the melting point of pure lauric acid and T2 is the melting point of the unknown & lauric acid mixture.