Prelab 2

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!

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…

PART 3- LABORATORY EQUIPMENT EQUIPMENT NAME FUNCTION To hold test tubes. Attaches to a retort stand to support glassware being heated. To pour liquid from a large container into a small container. To provide a flame during an experiment. ones To light the Bunsen burner. To attach test tubes to a retort stand. To clean substances out of a test tube. To hold a hot crucible or flask. To hold a hot test tube. To place on the lab bench to prevent burning or to use with ring clamp. To transfer small amounts of liquid. To grow bacteria or contain small experiments. To hold liquids. To measure liquids. To contain experiments (a stopper can be used to close the flask). To hold a hot beaker. To perform an experiment with a different substance in each well. To hold chemicals and perform experiments in. To scoop and transfer small amounts of substances, To stir during experiments that involve mixing or dissolving.

Please do it fast

Please answser 18-19-20

Please send me the question in 30 minutes it's very urgent plz

Answer number 9

Unknown Mixture #1 Unknown Mixture #2 Sample caffeine ibuprofen aspirin acetaminoph en Distance to solvent front 14,70 cm 14,70cm 14.70cm1u.70 cm 1나,구 cm |14.구0cm 5. 70 cm 11.90 cm I.85cm Distance Spot(s) traveled 175 cm 13.75cm 11.9 5 cm 6.4 0 cm 13,75 cm 13.75 cm 38 78 1908 .8095 Calculated R:(s) 119 ,9354 812 9 43 S .9354 9354 #1:Aspirin an d lbuprofen Components of Unknowns #2: Ace taminophen, aspirin an d ibu profen D. Additional Exercises 1. Which of the substances tested is most polar? What parts of the structure of this substance is polar? The Sul 2. Which of the substance tested is most non-polar? What parts of the structure of this substance in non-polar?

..HELP W/ORG CHEM HW

Table 2: Absorbance Values of Standards and Unknowns. Sample Blank Standard Solution 1 Standard Solution 2 Standard Solution 3 Standard Solution 4 Standard Solution 5 Water Sample 1 Water Sample 2 Phosphate Concentration (in ppm) Y17 0 ppm 0.02 ppm 0.04 ppm 0.08 ppm 0.16 ppm 0.32 ppm Freeman Lake 0.001 0.325 0.292 0.413 0.315 0.039 0.054 0.049 Absorbance at 2= 690 nm Calculations: 1. Construct a phosphate standard curve in Excel by plotting concentration (in ppm) on your x-axis and Absorbance (unitless) on your y-axis for your known solutions. Label the axes on the graph and provide the curve with a title. Use a linear trendline to generate a best fit line to your data. Label the graph with the equation and the R" value. Insert your labeled graph in the space below. X

5. EXTRACTION To 1 ml. of bromine water in a test tube add .5ml chloroform or carbon tetrachloride. Note the color of the liquid layers. Which layer is more colored? What do you call such liquids which do not form a homogenous mixture? Can you possibly make them homogenous? How? Transfer the mixture into a separatory funnel and add 2 ml. more of bromine water and add 1 ml. more of chloroform of carbon tetrachlorides then shake to effect proper mixing. Let out the lower layer through the stem of the funnel. Again add another 2 ml. to chloroform or carbon tetrachloride to the aqueous solution in the funnel and shake as before. How does the color of the chloroform or carbon tetrachloride layer compare with the first extract? How do you explain the difference? Is it possible that after several extractions the chloroform layer will become colorless? Why?

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 0.5 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.

Please answer fast i give you upvote.

. Be sure to understand what the dilutionfactor is for each sample (dilution factor = the number used to determine the actualconcentration of the stock UK after the diluted samples are analyzed) ?

I need help on questions 2-4?

Please don't provide handwriting solution

4 = 5 = 6 7 = 8 F 10 = 11 E 12 F 13 In a 0.20 mM aqueous solution of trimethylacetic acid (C¸H,CO,H), what is the percentage of trimethylacetic acid that is dissociated? You can find some data that is useful for solving this problem in the ALEKS Data resource. Round your answer to 2 significant digits. 0% Continue Submit Assignment O2020 McGraw-Hill Education. All Rights Reserved. Terms of Use | Privacy Accessibility esc 80 DD F2 F3 F4 F5 E7 F8 F9 F10 F11 F12

7-10 subparts

Subpart 4-6

Line equation?

please answer all w

this is for the Extraction and Isolation of Caffeine from coffee lab

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

In Figure 7 above, the 3 columns represent 3 different samples. Which column(s) represent pure compound(s)?

Blank 1 is an intensive property that is the basis of fractional distillation. Blank 1 Add your answer

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)).

Which of the following are properties of a good recrystallization solvent? Check all correct answers. Group of answer choices boiling point of solvent < melting point of crystals boiling point of solvent > melting point of crystals Crystals are soluble in solvent at low temperature and soluble at high temperatures. Crystals are soluble in solvent at high temperatures but insoluble or slightly soluble at low temperatures. Solvent boiling point is about room temperature. Impurities should be either soluble at all temperatures or insoluble at all temperatures. An abundant amount of crystals must be recoverable from the solvent.

please answer fast i give upvote

1 and 2 answers?