Lab 3

Most of the ultraviolet absorption of proteins at 280 nm is due to their content of a. Glutamate b. Tryptophan c. Alanine d. Aspartate

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8. You are using mass spectrometry to determine the molecular weight of a peptide, which has multiple peaks (each represents an M/Z value) during the detection. You obtain M/Z values of 305 and 609 for two of these peaks. What is the molecular weight of the peptide: 152 153 b. 305 d. 608 1217

In IR absorption spectra of a compound, strong absorptions at 3300 cm and 2100 to 2260 cm were observed. What functional group might the compound contain? a. Alkyne b. Alkene с. Alcohol d. Carboxylic acid

Answer in a detailed paragraph

9) I have circled six different species in the attachment table of standard reduction potentials. Just consider the half-reaction that involve the circled species. Which of the circled species are oxidizing agents? Which is the strongest oxidizing agent? Which is the weakest oxidizing agent? Which of the circled species are reducing agents? Which is the strongest reducing agent? Which is the weakest reducing agent?

Rank the following compounds in increasing Amax- I. II. IV. N(CH3)2 N(CH3)2 + -N(CH3)3 -N(CH3)2 А. I, II, II, IV В. П, IV, II, І С. П, IV, I, IIШ D. I, II, IV, III Е. Ш, І, II, IV

Tom, an analytical chemist, bought a bag of decaffeinated coffee from a grocery store. However,Tom suspected that he might have received regular coffee and therefore decided to analyze hiscoffee for caffeine. In the lab, he took 0.5 mL of the brewed coffee and diluted it in water tomake a 100.0 mL solution. He performed four analyses and found the concentrations to be 4.69,3.99, 4.12, and 4.50 mg/L, respectively. (Assume the density of all solutions is 1.000 g/mL,1oz= 28.35 mL).(a) Report the concentration (in mg/L) of caffeine in the brewed coffee using the format asaverage ± standard deviation. (Note this is not the concentration in the diluted solution.)(b) Look up the caffeine content of regular vs. decaffeinated coffee. Do you think that Tom wasgiven the wrong type of coffee?(c) Caffeine intake of 300 mg per day reportedly has no adverse effects in the vast majority ofthe adult population. If Tom drinks 3 cups (8 oz/cup) of this coffee daily, is his intake withinthis known safe…

Your answer is incorrect. The volatile organic compounds (VOCs) produced by decomposing tissue and organs were studied in an effort to identify possible human-specific markers (PLOS ONE 2015 10(9): e0137341.). Of 452 VOCs isolated, six were found to be unique to humans, so this may prove to be a useful tool for forensic chemists trying to determine the source of unidentified remains. There are two doublets in the expected ¹H NMR spectrum of the following human-specific VOC. Identify the protons giving rise to each doublet. HOHHHH H3C НН H3C- "DOOS 0 LAK 123 HH 3 Identify the two groups of protons that give rise CH3 6 CH3 8 the doublets in the spectrum.

Please answer the rest. This is using up another one of my questions

3) What is the approximate retention time of benzoate?

ANSWER ALL QUESTIONS ON THE WORKSHEET AND USE THE INFORMATION GIVEN IN THE IMAGES

How can you distinguish aldehydes, esters and carboxylic acids using IR spectra? Explain using specific examples.

Name the following organic compounds:

All ethyl esters of long-chain aliphatic acids (for example, ethyl tetradecanoate, C13H27COOCH2CH3) show significant fragment ions at m/z 88, 73, and 45. Draw the structure of the ion that gives the m/z 73 peak. • In cases where there is more than one answer, just draw one. • You do not have to include lone pairs in your answer. • Include all valence radical electrons in your answer. • Do not use the square brackets tool in your answer. ChemDoodle

What are two ways to measure the total amount of all proteins in a purification sample? O 1) Calculating the yield and 2) calculating the purity of a purification. O 1) Measuring absorbance at 280 nm and 2) using an enzymatic assay for your protein of interest. O 1) Quantitating the amount of your protein of interest using binding of a labeled antibody (e.g.. an ELISA) and 2) using a dye-binding assay. O 1) Measuring absorbance at 280 nm and 2) using a dye-binding assay.

In the synthesis of Sudan-1, the following precursors were used: Aniline – 0.2 mL β-naphthol – 0.35 g   Experimental data Weight of vial, g 13.1085 Weight of vial + recrystallized product, g 13.4714 Experimental melting point, °C 129-132 Given this data: What is the theoretical yield? What is the percent yield? What is the purity of the dye based on experimental melting point (theoretical is 131-133 °C) Please show solutions and equations

only do number 4 please

Electronic cinfiguration of carbon

Fill out this table, involving the compounds which will be used in this lab: Acetominophen Aspirin Caffeine Compounds (Analgesics) Structure Phenacetin Salicylamide Based on these structures, which of the analgesics is the most polar, and which is the least polar? Which will travel the highest on the TLC plate when using a low-polarity solvent?

Dangerous Paint Stripper Jessica has a summer job working for the city parks program. She has been using a cleaner called “Graffiti Gone” to remove graffiti from the bathrooms. She has to take a lot of breaks, because the chemical makes her throat burn. It also makes her feel dizzy sometimes, especially when the bathrooms don’t have very many windows. On the label, she sees that the cleaner has methylene chloride in it. She feels like she’s managing to get the work done, but she is worried about feeling dizzy. She wants to find out more about this chemical, what harm it can cause, and whether there are safer ways to do this work. Questions for following story. 1. What went right in this situation? 2. What went wrong in this situation? 3. What steps should be taken in this workplace to make sure employees are better protected and prepared the next time?

Which statement is true? Statement 1: In a paper chromatography that uses a cellulose-based filter paper as stationary phase and hexane as the mobile phase, polar compounds are expected to have higher Rf values than that of non-polar compounds.Statement 2: In paper chromatography, polar compounds tend to outdistance the non-polar substances.

I need the answer to this question within 2 hrs please. It's my homework and I'm facing a problem. Would appreciate it if you help me out as soon as possible.

I. Look at the MS/MS for paracetamol (a drug), explain the peaks seen at 134 and 110, and draw the structure for the 110 peak. Paracetamòl N-(4-hydroxyphenyliacetamide ESI+, MS/MSs Kky pan_03_c80720211368 1-38 RT: 0.00024 AV 35 N: 107ES T TMSES F ms 12.00g24 00 0 00-10.0g 100g 110.0 CH но 70 (M.H]* 162.0 16 1340 130 100

On each mass spectrum above, indicate the base peak and the molecular ion peak (or at least where you would expect to find it) and if the base peak on the mass spectrum for linalool has m/z 71, propose a structure for this fragment ion.

only the questions pls disregard the experiment results thank you

A student was trying to determine the identity of an unknown compound.  The melting point of the compound was 117-118oC. The student narrowed the possible compound down to the following:   Compound Melting Point Range acetanilide 113-115oC fluorene 114-116oC mandelic acid 120-122oC A second student, doing the same experiment as above, found that their melting point was 100-108oC.  What is wrong with the student’s melting point? Propose two reasons why the melting point could be incorrect. View keyboard shortcuts

Refer to the following information to answer questions 1 to 9: As a biotechnologist working for a pharmaceutical company, you as tasked with preparing the cardiac antiarrhythmic agent Amelfolide from p-nitrobenzyl chloride and 2,6-dimethyl aniline (Figure 2.1). You are provided the starting materials and asked to prepare 7.50g of pure material. No other instructions are given to you. MW 2,6-dimethylaniline = 121.18 g/mol MW p-nitrobenzyl chloride = 185.56 g/mol MW Amelfoliode = 270.29 g/mol %3D NH2 CI O2N O2N When developing a synthetic scheme, the first thing to do is check the scientific literature to see if someone has done this reaction before you. Upon performing a literature search, you identify a publication where a group from Japan has performed the same reaction you are tasked with completing. The paper is in Japanese and you cannot read the details of the procedure, however, you can make out that the reaction is performed using DCM as the solvent and proceeds with a yield of…

Please answer it. I upvote

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