4. A student prepared a compound. The melting point of the crude product was 42 to 48°C. After purifying the solid for the first time, the melting point was 47 to 51°C. After another purification, the melting point was 50 to 53°C. At this stage, can the student confidently say the product has been completely purified? Justify your answer. ied

4. A student prepared a compound. The melting point of the crude product was 42 to 48°C. After purifying the solid for the first time, the melting point was 47 to 51°C. After another purification, the melting point was 50 to 53°C. At this stage, can the student confidently say the product has been completely purified? Justify your answer. ied

Introduction to General, Organic and Biochemistry

11th Edition

ISBN:9781285869759

Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres

Publisher:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres

Chapter31: Immunochemistry

Section: Chapter Questions

Problem 31.72P

See similar textbooks

Similar questions

(1) GUIDE:- Substituted working formula - From the general formula, directly present your answer with substituted values already - Format: "F=_+_-_" (examples: F=2+1+1 , F=1+2+2 ... ) - Spaces and other formats will invalidate your answer - Degrees of freedom - Multiple choice, each item is equivalent to one ANSWER THIS QUESTIONS 1a. What is the number of components for the formulation: "Beeswax + Glycerin + Methyl paraben"? CHOICES: A. ONE, B.ZERO, C.TRHEE, D. TWO 1b. Present your working formula for the formulation: "Beeswax + Glycerin + Methyl paraben" 1c. What is the degrees of freedom for the formulation: "Beeswax + Glycerin + Methyl paraben"? CHOICES: A. ONE, B.ZERO, C.TRHEE, D. TWO
You’ve collected a soil sample from an unexplored island and cultured a new bacterial species by growing it on complete media. Being a wild-type strain, you assume it is prototrophic. What would you do to determine whether this is true? Assume you find that your new bacterial strain is auxotrophic. What might you do to determine what kind of auxotroph it is?
what is a reason why company leaders would add melamine to their product to make the protein content appear higher than the actual amount of the product? Describe two possible reasons for why food safety inspectors often use an overall nitrogen content test, instead of Bradford assay, to determine the protein content in a product.
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?
1. Furosine and lactulose are 2 Maillard reaction products that are monitored to indicate milk quality. Describe how they are formed (what chemical entities and reactions are involved)? What are the conditions that favoured their formation? Why their formation can be used to indicate milk quality? 2. What is lignin and where are they found?
1. How does salt get into crude oil? Why does crude oil require refining? 2. What was the principal driving force that initiated the thermal refinery? 3. Why fractions of higher boiling from crude oil (such as heavy gas oil) does not make a good fuel for engine combustion?
Furosine and lactulose are 2 Maillard reaction products that are monitored to indicate milk quality. Describe how they are formed (what chemical entities and reactions are involved)? What are the conditions that favour their formation? Why their formation can be used to indicate milk quality?
Distinguish between mixed-acid fermentation and butanediol fermentation and describe the test(s) that can be used to detect each. Briefly describe the reactions and changes that take place during the decarboxylation of amino acids in the decarboxylase medium. Explain the experiment that you would perform in order to determine whether the organism that you were instructed instructed to identify is positive or negative for gelatin hydrolysis. How do microorganisms such as bacteria eliminate harmful reactive oxygen species? Nitrate reduction to nitrite is indicated by the formation of a pink to red color after addition of nitrate test reagent. However, if a culture does not produce a colour change several possibilities exist. Explain.
Sequencing. Arrange the following procedures according to the CORRECT manner of preparing products. USE LETTERS IN SEQUENCING. 1. Turpentine Emulsion Preparation A. Triturate rapidly until the product is creamy while producing a crackling sound. B. Transfer to a graduate and made to volume with water. C. Solid substances like preservatives are dissolved in a suitable volume of water and are added to the primary solution. E. Add other formulative ingredients miscible with external phase AB. Triturate gum with oil in mortar until thoroughly mixed. AC. Add two parts of water all at once. 2. Methyl Salicylate Emulsion A. Add the remaining water to make final emulsion. B. Oil is first shaken thoroughly with the gum. C. Add the water all at once and shake vigorously. D. Add more water in small proportions with constant agitation in each addition. 3. Tragacanth Mucilage A. Mix water with glycerin and heat to boiling. B. Stir until uniform and strain if desired. C. Add water to make the…
Albert Szent-Gyorgi, a pioneer in early pho-tosynthesis research, stated, “What drives life is a little electric current, kept up by the sunshine.” What did he mean by this?
Heat the reaction mixture, (p-aminophenol, distilled H2O, and acetic anhydride). with stirring, directly on a hot plate, using a thermometer to monitor the internal temperature (about 100°C). After the solid has dissolved (it may dissolve, precipitate, and redissolve), heat the mixture for an additional 10 minutes at about 100°C to complete the reaction. (Final product crude Acetaminophen) <--What if the following was heated to 200 °C instead?
Which statement is true regarding drugs given intramuscularly?A. The drug goes directly to the network depotB. all answers are correctC. The drug undergoes an absorption phase until it reaches the blood circulationD. the drug passes through the bloodstream in the processE. The drug is absorbed from the gastrointestinal tract In drugs that undergo an enterohepatic cycle, drugs that are already in the intestine will experience ….A. reaction with intestinal bacteria so that it becomes lipophilic and can be excreted through fecesB. reaction with intestinal bacteria so that it is hydrophilicC. re-absorption because it reacts with intestinal bacteriaD. excretion through the intestineE. absorption of drugs into the kidneys