Chapter 9 Homework

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blue ink from three different pens appears to be the exact same color. explain how to determine whether the dyes are identical

Help Save & Exit Submit Methanol (CH3OH) is converted to bromomethane (CH3Br) as follows: CH3OH + HBr CH3B + H20 If 12.23 g of bromomethane are produced when 5.00 g of methanol is reacted with excess HBr, what is the percentage yield? Multiple Choice 12.9% 33.8% 59.1% 2:41 PM 11-Mar-2. asus COLLECTION prt sc delete 12/A 7 (3) & %3D 8.

Chemistry Interactive 3D display mode H₂C-9 Submit 9129₂293 -C-C-NH₂ 0 Request Answer

HDPE and PS are both inert to bases and acids, which plastic would you rather chose to put 1 Liter of 6M HCl for general chemistry lab? Explain why.

retrosynthesis problems. Complete -ia x-208

The spectrophotometer is set at 600 nm. The absorbance of each cuvette is read. The data is shown below: Cuvette 1 is the clank Cuvette # ml albumin Absorbance 0. 0.2 .063 3 0.4 .163 4. 0.6 .187 0.8 .253 1.0 .289 Using this data, plot an Excel graph showing absorbance (y-axis) vs ml albumin (x-axis). Find the correlation coefficient (r). R2 > 0.99 = excellent data; r2 0.98-0.95 good data r2 0.94 -0.90 = fair data. How would you describe this data?- To find the relative sensitivity, for each of tubes 2-6 (neglect blank), perform the following operation absorbance (Lowry)/Absorbance (Biuret x 0.5 gram albumin (Biuret)/0.05 gram (Lowry) x 200 ml (Lowry)/100 mL (Biuret). This implifies to Relative sensitivity = 20 dilution factor x absorbance (Lowry)/Absorbance (Biuret). Report your relative sensitivity as an average of all 5 values.

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How do I find Concentration? flask Calculate solution Concentration (M) Volume stock of 0.40 M CuSO4 (ml) Volume of flask (ml) Absorbance at 635 nm(a.u.) 1   2.0 10 .185 2   4.0 10 .362 3   6.0 10 .510 4   8.0 10 .674 5   10.0 10 .843

Hello, I would like help with problem 41 in the image attached.

Please do question 5 for me and please don’t return in it just write one sentence for each box

these  both imagess are  linked. I need answers from 11 to 15

1) Which of the diet sodas have the highest concentration of caffeine? Which standard best reflects this concentration?

#40 & 42

Can someone help me interpret this data to be put on my research paper? This is the absorbance spectrum fo Sulfamethoxazole (sulfonamide antibiotic). Thank you so much!

MRI machines primarily work using ____.a. The nuclei of carbons in fatty acid chainsb. The nuclei of oxygen atoms from water molecules in the bodyc. The nuclei of hydrogen atoms from water molecules in the bodyd. The nuclei of radioactive isotopes injected into the body

Shown here is a Lewis structure for the chlorate ion, CIO3 , that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s). What is the formal charge on CI? :ö: Multiple Choice -1 +1 None of the above

q41 IF YOU DO NOT KNOW THE ANSWER PLEASE DO NOT REJECT IT please calculate the unknown concentration of the protein D wih an absorbance value of A412 given the standard curve indicated in the table. write your answers in numbers only with 2 decimals. protein concentration (ug/ml) absorbance 0 0.000 0.02 0.161 0.04 0.284 0.06 0.438 0.08 0.572 0.10 0.762

Nothing is graded. They’re homework questions that I started.

2. MF= C12H160 QE-300 20 200 180 160 140 120 100 80 60 40 20 2 2 3. 2 11 10 9 8 7 6 5 4 3 1

Need solution urgently write a brief summary about two-dimensional PtSe2

Humulin R U-100 insulin 30Units = ________ml

Suspect #1: George Norman Suspect #2: Becky Baker George Norman recently Becky Baker is a world famous chef. She had just finished baking a cake at the time of the crime. The recipe called for baking soda. The formula for baking soda (sodium bicarbonate) is had an accident where he cut himself with a Alaia knife. He cleaned the wound with rubbing alcohol. The formula for rubbing alcohol Bak ing Seda NaHCOз. (isopropanol) is C3H80. Suspect # 3: Liz Lemon Suspect #4: Ben Linus Liz Lemon just had her nails Ben Linus had been walking done, and she still has traces of nail polish remover on her hands. Nail around in the rain for about an hour before the crime polish remover he was suspected contains acetone. Acetone of occurred. He The formula for Polish was dripping wet with water acetone is C3H60. renover at the time. The formula for water is H2o.

This is not a graded assignment, this is a question from a worksheet that I am teaching, and I wanted to check my answers please:On a graph of Absorbance and Concentration. There are three data points in addition to (0,0). The first point is 0.189 Absorbance for 2x10^-6MThe second is 0.378 Absorbance for 4x10^-6MThe third and last is 0.634 Absorbance for 6x10^-6M (slightly above the trendline) a) If you recorded an absorbance of 0.525, calculate the corresponding molarity of the solution.  b) If the molar mass of the dye used was 791.41 g/mol, how many grams of dye were dissolved in 10.0 mLof the solution measured in part a? c) What is the calculated absorbance for a solution with a concentration of 1.5x10-6 M?  d) Propose a logical reason for the error that occurred with the data point at 6.0 x10-6 M.

Complete the table with at least 3 Major NMR shifts. Normal NMR Analysis BIU X₂ X²- Chemical shift, ppm Integration Multiplicity fxe Part of structure Tx

What is the retention factor (Rf) of the most polar and least polar spot present in the standard ink? (Use 2 significant figures)

analyte concentration(C)(mg/ml) injection volume (ul) elution time (time) peak DAD signal(mAU) caffeine 1 1 4.67 302.85 aspartame 5 1 7.53 15.83 benzoic acid 1 1 8.14 89.98 saccharin 1 1 1.91 84.86 mixture(add everything above with 1:1:1:1 ratio)   1 4.47 69.58 How to get the concentration of the mixture in this case?

The concentration and absorbance data below were collected for compound X. A sample of compound X of unknown concentration has a corrected average absorbance of 0.5621 (3 replicate measurements). Calculate the y-intercept. CONCENTRATION (mg/mL) ABSORBANCE 5 0.422 10 0.510 15 0.621 a. 0.299 b. 0.222 c. 0.319 d. 0.553

I Part 3 Discussion questions: Please answer in less than 2 paragraphs (20 points) 1. The FDA scientists have published 2 papers on the subject of sunscreen dermal absorption. What is different between the publications? The editorial page in the journal JAMA (Journal of American Medication Association) might help you answer this question.

Help with C & D!

2. 100 12 133 134 1 0 С6H8O 4000 9 HSP-45-691 8 3000 1 : 7 1 T 6 2000 5 ppm NAVENUMBERI : 4 T 3 1500 4:2 T 2 T T 1 wwwm 1000 0 500 DEPT-90 DEPT-135 - 200 180 160 140 120 COS-11-743 لد 100 ppm 80 60 40 20 m 0