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

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…

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

Consider the following data that was collected for a protein that contain 0.76 % tryptophan amino acids by weight (Molecular weight of tryptophan amino acids is 204 g/mol). Absorbance Concentration (mg/L) 0.0250 0.100 0.150 0.226 0.259 0.400 0.600 0.964 1.14 1.78 1.45 2.35 1.78 2.87 How many mg of the protein present in 1.00 L solution that shows an absorbance of 1.20?

a) Lysine is an essential amino acid. It is taken by some people as a nutritional supplement in the form of a hydrated crystalline solid with the formula C6H₁4N2O2.XH₂O . To control the dose of lysine, it is essential to know the complete formula of the hydrate, which means determining the value of x. To determine the value of x in lysine hydrate, a pharmacist used a direct titration method. She dissolved 6.258g of the compound in approximately 100mL of distilled water and then made this up to 250mL in a volumetric flask. She then titrated 25mL aliquots of this solution with a standardized NaOH solution of concentration 0.1050 mol dm-³, obtaining a mean titre of 36.30 mL. In titrations, lysine behaves as a monoprotic acid. Use these data to determine the value of x in lysine hydrate. b) In a second experiment to verify the value of x, the pharmacist heated a 3.752g sample of the lysine hydrate to drive off all the water. When she reweighed the sample, the mass was 3.278 g. Use this…

18. Dehydroascorbic acid is the oxidized form of ascorbic acid 19. Iodine when present in solution at high concentration is seen as a reddish brown solution 20.Starch must be added to the titration mixture before the end point True or false

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3 ways to separate alcohol to a liquid mixture and its step by step procedure

Which one of the following could be classified as a quantitative analysis?   Choices Isolation of omega-3 fatty acid from fish oil Determination of the omega-3 fatty acid content in olive oil Determination of fatty acid types in cooking oil Separation of fatty acid mixtures in guts of salmon