231L+Dyes+TEMPLATE 2023-04-18 20_33_05

Not exactly sure how to fill out the table?

Hello, please answer the following attached Chemistry question correctly and fully based upon the attached table. Please answer the "Low and High absorbance" parts. Thank you.

This is going with the first assignment I submitted. Fingerprinting

Chemistry Hi, i just need some help on how to calculate the concentration of the samples? Thank you

What, if any, impact is using drops instead of specific volumes has on the experiment?

is one able to help? please

Instruction: 1. Using a 25-mL glass stoppered buret filled with distilled water and with an initial reading (IR) of 0.00 mL, if about 1/3 of the content is run down record the final reading (FR) for Trial 1. For trial 2  run down another 1/3 of the content. Record the IR and FR of the second trial.   2.  Using a 25-mL rubber stopperd buret  filled with distilled water and  with an  initial reading (IR) of 0.00 mL, if about 1/4of the content  is run down record the final reading (FR) for Trial 1. For trial 2  run down another 1/4 of the content. Record the IR and FR of the second trial.

Instruction: 1. Using a 25-mL glass stoppered buret filled with distilled water and with an initial reading (IR) of 0.00 mL, if about 1/3 of the content is run down record the final reading (FR) for Trial 1. For trial 2  run down another 1/3 of the content. Record the IR and FR of the second trial.   2.  Using a 25-mL rubber stopperd buret  filled with distilled water and  with an  initial reading (IR) of 0.00 mL, if about 1/4of the content  is run down record the final reading (FR) for Trial 1. For trial 2  run down another 1/4 of the content. Record the IR and FR of the second trial.   3. Complete the table.   1. Buret with Glass Stopper                TRIAL 1             TRIAL 2 Final reading     Initial reading     Volume Used               2. Buret with Rubber Stopper                TRIAL 1             TRIAL 2 Final reading     Initial reading     Volume Used

sub= 18 help

PART ONE: Preparation of FECNS* Solution Prepare the two solutions in table 1 by accurately measuring the required volumes of distilled water and CNS into two labeled test tubes. The absorbance of the solutions must be measured soon after adding the Fe" solution from a buret. TABLE 1 Fe 5 ml 5S mL Solution Distilled Water CNS 2 mL Total Volume 3 ml 2 ml 10 ml 3 mL 10 ml In this part of the experiment you are to explore what the above quote means. As a PRELIMINARY Exercise, formulate a hypothesis as to what would happen under each of the following circumstances: 1. 1ml of 0.0020 M CNS' solution is added to the unused portion of solution 1 in the test tube 2. One drop of 0.20 M CNS solution is added to the unused portion of solution 2 in the test tube.

Using the lab instructions and data table with data, please help me complete part 1 and 2 of my lab worksheet

St. John's University Department of Chemistry CHE2241L Date 427/2022 8:00AM Organic Lab Final Exam NAME 1) The attached picture shows the structure of aluminum oxide the column chromatography stationary phase that we used to separate fluorene from fluorenone. Iis this compound a) Polar 5) Nonpolar Explain why it is polar or nonpolar. It is because 2) Safety: Which of the following chemicals are extremely flammable: a) diethyl ether b) acetone c) methanol d) benzyl alcohol e) All of the above except d.

It's important to mark the solvent front with a pencil after the plate is finished being developed in order to calculate an Rf. Group of answer choices True False

3. Using the data at right: a. Calculate the absorbance of each sample. You will need to express the %T values as decimals before calculating the logarithms. (e.g., for T = 25%, A = -log 0.25 = 0.602) b. Use the graph paper on the back of this page (or a spreadsheet) to plot absorbance vs. concentration. Make a proper graph, with labeled axes, uniform scales, etc. Use a ruler to draw the best-fit line.. C. Use the graph to find the concentration of the un- known sample. (Draw dotted lines on the graph showing how you found your answer.) CONCENTRATION PERCENT (ppm) TRANSMISSION 0 100.0 100 74.1 200 54.9 300 40.7 400 30.1 500 22.3 unknown 31.6 ABSORBANCE

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Peak Retention Time (minutes) Area 1.201 136501204 acetone 2.011 1253056 toluene ortho-product para-product 3.201 8340750 3.350 14890645 a) What was the relative percent yield of the ortho-product? b) What was the relative percent yield of the para-product? c) What was the relative percent yield of the product?

100 MASS SPECTRUM 80 60 40 20 0.0 10 20 30 40 50 60 m/z NIST Chemistry WebBook (https://webbook.nist.gov/chemistry) 1. What is the M'? 2. What is the m/z of the base peak? 3. Does it contain chlorine? Explain your answer. Rel. Intensity

▪ True or False: In an untargeted analysis by GC-MS, we extract all acidic drugs and all basic drugs using SPE with hydrophobic resin. A)True B)False ▪ In a comprehensive drug screen by GCMS, we set the detector to what mode and why? ▪ A) Full scan; we don't know what analyted are in the sample, so we don't know what m/z to focus the detector's time on. ▪ B) SIM; We have a good id

0.200 M 0.00200 M Test Tube No. [FESCN2*1std (M) Absorbance Fe(NO3)3 (mL) KSCN (mL) 17.98 1.97 0.815 5 (Standard) Edit Edit Edit NG 1 Info

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

Please answer all and post below the answer the source from where you got the answer thank you!

A) Using the Data Graph below (with the equation for the best fit line), Camculate the concentration of a solution with an absorbance of 0.385.  B) Write the KC Expression for the Lab's Reaction.

Please correct answer and don't use hand rating

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.

Pre-Lab Assignment Goals and objectives of the experiment should be written in your laboratory notebook. Pre-Lab Question 1. Make a list of the IR bands and predict the absorption frequencies for the following compounds. a) 2-Chloropropionic acid b) Methyl salicylate

DATA REPORT FORM Procedure A: Ink Analysis by Paper Chromatography 1. Attach the chromatography paper results here. Name 2. Calculate the Rf value for each ink/marker sample. If there are more than one spot in the sample, calculate and list Rf for all components. Procedure B: Identification of Unknown Analgesic Drugs 1. Sketch the best results of the TLC plate here, including unknown sample and known compounds. 11

If the peak width w of both Peak 1 and Peak 2 fro eon 1g is 0.5 minutes, what is the resolution factor between the two peaks? 1.13 Selectivity is Peak 1 (6.0 min, Peak 2 w=0.5 (6.8 min, w=0.5 25 min) min) 20 15 Hold up peak (1.8 min) 10 0. 0. 4. 8. time (minutes) 2. 5. Signal

3) 3-Methylbutyramide 100 relative intensity .8888 relative abundance .88 CHINO 101 298 888 mass charge (m2) CaH₁N 60 4) n-Butylamine 100 60 CHOCHOCHS R98 8 mass charge (m/z) MW=101.15 MW-73.13

2.Dscribe The History of Forensic Chemistry? 3.Enumerate and discuss the functions of forensic Chemist. 4.Discussed the Purposed of the Golden rules in the practice of Forensic Chrmistry. 5.What is Toxicology. 6.Discussed the History of Toxicology. 7.Discussed Tbr collection of Sample for toxicology. 8.Discussed The importance of toxicology. 9.Discussed the Types of poison. 10. Discussed the entrance and elimination of poisons in Human body....

Please help! I don't know how to even start

ucumberlands.blackboard.com Take Test: Quiz 3 - Spectroscopy Test Informatlon Description Instructions This test has a time limit of 50 minutes. You will be notified when time expires, and you may continue or submit. Warnings appear when half the time, 5 minutes, 1 minute, and 30 seconds remain. Timed Test Multiple Atternpts Not allowed. This test can only be taken once. Force Completion Once started, this test must be completed in one sitting. Do not leave the test before clicking Save and Submit. Remaining Time: 22 minutes, 36 seconds. Question Completion Status: AMoving to another question will save this response. Question 19 The amount of energy in infrared (IR) light corresponds to: the amount of energy needed to increase certain molecular motions, such as bond vibrations, in organic molecules the amount of energy needed to strip a molecule of one electron to generate a cation radical the amount of energy needed to promote one electron from a bonding to an antibonding molecular…