A melting point of an old sample of Naphthalene was completed and a melting range of 78-79 °C was observed and recorded. The accepted literature value for the melting point of Naphthalene is 80.2 °C. A melting point of a sample of Urea was completed and a melting range of 120-129 °C was observed and recorded. The accepted literature value for the melting point of Urea is 133-135 °C. What does the melting point range and percent error suggest about the samples for Naphthalene and Urea ? 12pt Paragraph BIUAT²

Impure Compound X was found to have a melting point range of 106-114 oC. What do each of these numbers (104 and 112) represent?

Which of the following is NOT a distillation technique? . Simple distillation Density distillation Vacuum distillation Fractional distillation

67. This compound is called Steroid Glycerin Wax

21-48 List all of the functional groups that make taurocholate water-soluble.

Solution Concentration of FeSCN2+ (M) Absorbance1 0.0000491                                              0.3112 0.0000818                                               0.5763 0.000115                                                    0.7554 0.000152                                                       0.9075 0.000196                                                        1.185     Solution Concentration of FeSCN2+ (M) Absorbance 1 0.0000491 0.311 2 0.0000818 0.576 3 0.000115                              0.755 4 0.000152                                0.907 5 0.000196                               1.185   A series of aqueous solutions of FeSCN2+ of different concentrations were prepared, and the absorbance of each was measured at a wavelength of 455 nm. Use Excel or Google Sheets to prepare a useful graph of the data (given below) that could be used to determine the concentration of an unknown solution from its absorbance. Ensure your graph is properly formatted and labeled. Click the…

105 100 95 75 0 1 2 3 4 5 67 8 9 10 11 12 13 14 15 16 17 18 19 20 Volume distillate collected (mL) 1. Indicate the volume of the distillate at which you should stop collecting to make sure that the distillate is only composed of one component. 2. Indicate the boiling point range involved in the collection of this amount of distillate. Temp in Still Head ("C)

The melting point of acetanilide is 114.3 C. The melting point of the crude acetanilide was 113 C. How does the melting point of the crude compare to the reported melting point? Draw a conclusion about the synthesis based on this.

The type of separation technique that is based on distribution of organic compounds between two immiscible solvents is O crystallization O distillation extraction O sublimation

A compound's literature melting point is118°C under normal atmospheric pressure. Which of the following samples must have the highest percentage of the compound? (experimental melting point ranges are given) a. Sample 1 (MP 108-116 degree C) b. Sample 2 (MP 113-114 degree C) c. Sample 3 (MP 115-117 degree C) d. Sample 4 (MP 120-127 degree C)