Exam 1 (Answer Key)

SERIAL DILUTION: PROBLEM SOLVING. Set up five (5) tubes on the test tube rack and label them 1-5. Place 0.9 ml of saline to tube #1 and 0.5 ml of saline to tubes # 2-5. Add 0.1 ml of patient's serum to tube #1, mix and transfer 0.5 ml of the mixture to tube # 2. Then, mix and transfer 0.5 ml of the mixture to tube # 3. Mix and continue dilutions through tube # 5. Discard O.5 ml from tube # 5. Finally, add 0.5 ml of the reagent to each tube # 1-5. Compute for the initial dilution of tube #1 and final dilution of tube #5. Show your computation and encircle your final answer.

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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.

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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?

I need answers for # 2-9 on this worksheet

D. Solvent Extraction Samples Upper phase Lower phase Oil + Water Kerosene + Oil

Subparts 4-6

7. You can see an MSDS below. Please answer the following questions related to the MSDS. a) What is the name of this chemical? b) What should you do if someone drinks the chemical? c) Would this chemical catch on fire if it was exposed to flames? d) If this chemical gets in your eye what should you do? e) What color is this chemical? f) What should you do if someone spills a small amount of the chemical?

Use the following data to answer questions 1-5 below. Metal Rxn with Rxn with Rxn with room Rxn with warm acid water steam temp acid Didn't observe Fizzes slightly Vigorous gas production Small bubbles Didn't observe NR Steady stream of bubbles Didn't observe C Didn't observe NR NR A few bubbles Didn't observe Didn't observe Vigorous Vigorous bubbles and the sample dissolves bubbles Question 1 Which of the following is the least active metal? O A OD O B MacBook Pro

Color BEFORE adding Color AFTER adding Intensity of color AFTER adding FeCl3 Test Tube # FeCl3 FeCl3 #1 (salicylic acid) clear lilac 100% #2 (commercial aspirin A) clear slightly pink 50% #3 (commercial aspirin B) clear lilac 95% #4 (aspirin from your clear pink 20% synthesis above) #5 (control) clear clear 0% Based on this data and the melting point of Aspirin, how pure is the synthesized product?

Hello, the priority to be answered would be page 1 (1st image). However, I can put part 2 (2nd image) on a new question/post. Just wanted to include that in this post for reference to whoever will answer it. Thank you!

Please help me fill the table.

c) the following are the active ingredients of some of over the counter pain relievers (analyzed by TLC In Lab 9). For each circle the different functional group and name the functional groups (hint is given to help you with the number of functional group) CH3 H3C HO ÓH ČH3 acetaminophen ibuprofen caffeine aspirin 4 functional group 4 functional group 3- functional group 3-functional group

Please help me graph this on a graph like this .

PLEASE Answer within 20-30 minutes. Thank you!

Sea X Assignments: ANATO X Gi 0220907135028396%20(1).pdf 2 CD Page view Human Anatomy X A Read aloud *20220907135028396 X TAdd text Draw 4 You prepare four solutions: Solution 1: Reactants + enzyme at #0 (about 100°F) and pH 7 Chemistry Check your recall lab. x V Highlight UNIT 2 65 3 Decompression sickness (also known as the bends) is a condition that affects divers and others operating under pressurized conditions. It occurs when gases such as nitrogen (N₂) come out of solution in the blood. This can lead to symptoms including joint pain, shortness of breath, and paralysis. Severe cases may result in death. a What type of molecule (ionic, polar covalent, nonpolar covalent) is nitrogen gas? b The liquid medium of blood is water. What type of compound (ionic, polar covalent, nonpolar covalent) is water? c What happens when molecules such as nitrogen gas mix with water? How does this explain the problems we see with decompression sickness?

Table #2 Worktable for BCA Assay Standard Water (μl) Tube # 1 2 3 4 5 6 7 8 9 0 125 325 175 325 325 325 400 400 BSA source (μl) 300 stock 375 stock 325 stock 175 of tube #2 325 of tube #3 325 of tube #5 325 of tube #6 100 of tube #7 0 Protein (ug) Add the volumes listed in Table 2 to each tube. Add the water first and then the appropriate standard. Pipette each of the protein samples directly into the water, do not dribble on the side of the test tubes. The standard is at a concentration of 2 mg/ml and contains bovine serum albumin (BSA). Calculate the amount of BSA protein added to each of the tubes and write this in Table 2 (Protein (ug)).

What would be an appropriate shelf-life, t90, for this drug (in days) in this solution?

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

I need help understanding how to do this, can you please show me how you get the CFU/mL

To run a spectrophotometry experiment, begin by warming up the spectrophotometer and preparing the samples. Be sure to select the correct absorbance (X), then run a measurement on the sample solution. Follow up by running measurements on sample solutions. Once data is collected, turn off the instrument, clean the area, and discard the samples. Partially correct (2 of 4 correct)

Could someone Please Help with these! No plagiarism Please! A tire inflated with air is an example of a ___________________________. Evidence - Explanation - A pellet of sodium (Na) sliced in two pieces is an example of a _____________________________. Evidence - Explanation -

How does analytical chemistry help in forensic science?

Carla is using a fertilizer that contains nitric acid. How is nitric acid classified? strong acid weak acid strong base weak base Save and Exit Next Mark this and return ContentViewers/AssessmentViewer/Activit.

Table of chemicals and reagents with their physicochemical properties (name, molecular formula, molecular weight, pKa, melting point, boiling point, etc.) Write a short outline or a flow diagram of the procedure List and safety issues Read and understand the MSDS information for each chemical used in this practical Experimental procedure Please do not scratch the clear sides of the UV cuvettes as this will invalidate your results. Part 1: Preparation of a calibration curve A calibration curve should be constructed using at least five concentrations of the pure paracetamol standard supplied in the range 3-15 ug/mL as follows: Weigh about 150 mg of paracetamol accurately and transfer to a 200 mL volumetric flask. Add 50 mL of o.1 M NaOH and dilute to about 100 mL with deionised water (DI). Shake and make up to volume with DI water. Dilute 10 mL of the resulting solution to 100 mL (volumetric flask) with DI water (= stock solution). Prepare standard solutions containing 3, 6, 9, 12 and 15…

STANDARD SAMPLE PREPARATIONS FOR ABSORBANCE & CONCENTRATION DATA Concentration of stock nickel sulfate hexahydrate solution = .400 Molarity Sample Volume Absorbance Concentration (In Molarity) a 5 mL .179 10 mL .329 15 mL .588 20 mL .760 25 mL .939 Reference Blank = 0 Please show how to find Molarity, please show steps. Thank you and stay safe.

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Why is the glucose assay one of the most common analytical test performed in clinical chemistry.

Data Collection Kinetic Data Collection Time, t (s) Volume of added base (mL) First addition 40 0.50 Second addition 101 1.00 Third addition 160 1.52 Fourth addition 224 1.99 Fifth addition 278 2.49 Sixth addition 334 3.01 Seventh additlon 389 3.48 Calculations Concentration of NaOH stock solution: 0.01 M Concentration of t-BuCl stock solution: 0.2 M Volume of t-BuCl solution: 10 mL stock stock solution added to 25 mL acetone Table view List view Kinetic Data Volume of Moles of Amount of t-Bucl (mol) [-Buc] In[-BuC Time, t (s) added base added base (mL) (mol) First addition 40 0.50 Second additlon 101 1.00 Third addition 160 1.52 Fourth addition 224 1.99 Flfth additlon 278 2.49 Sixth additlon 334 3.01 Seventh addition 389 3.48 Use the data in the table above to plot In[t-BuC]]; vs time (s). Include labelled axis, a title, and a linear trendline. Upload your plot here.

Will you check number 1? How do you do the other two questions. I don't understand. Please help.

I need help completing this I just need the formula and names of each box, there are some that I did.

Which of the following are hazards in this lab? Choose all that apply. Group of answer choices NaOH HCl NH3 acetic acid deionized water

II. b) What is the difference between liquid-liquid, solid-liquid and solid-phase extraction? Complete the table below and sort the following examples in the correct column: Steeping tea, washing an organic phase (workup), brewing beer, chemical desalting of crude oil, activated carbon sugar decolorization. liquid-liquid solid-liquid solid-phase Phase that contains analyte before extraction? Phase that contains analyte after extraction? Example(s)