Lab 3 REPORT FORM - Greg Chekerdjian

• Stock solution: 1000 mg/L Target sample concentrations: 50-400 mg/L • Create a 5-point standard dilution to cover the test • If each test only needs 10 mL, make plans to make the dilution so you have 20 mL of each concentration. ·

Please let me know which 2 answers are correct, an explanation including evidence

1. What are fibers and where are they found? How could forensic scientists use fibers to solve a crime?   2. Define the word probative. What is the probative value of a fiber in a forensic investigation?     3. Describe steps you would take from collecting a fiber(s) at a crime scene to performing an analysis to determine its identity.     4.  Which of the 6 fiber types you observed are natural? Which are man-made?     5.  Are fibers classified or individualized? Why?

In a chromatography experiment, samples can be separated based on their polarity. If you have a polar solvent and nonpolar chromatography sheet, what conclusion can be drawn from analyzing the results? A. The sample that travels farthest up the sheet is most like the solvent, therefore it must be polar. B. The sample that travels farthest up the sheet is most like the solvent, therefore it must be nonpolar. C. The sample that doesn't travel at all and stays near the origin is most like the sheet, therefore it must be polar.  D. The sample that doesn't travel at all and stays near the origin is most like the solvent, therefore it must be polar.

Vacuum filtration is just one method that can be used to separate the components of a mixture. Describe another method for separating the components of a mixture, and comment on how "green" the method is. Be sure to indicate the physical state of each component during separation. Scientific literature should be cited as part of your response.

a. What instrument was used to discover the structure of DNA? b. What shape was expected from the instruments output? VWhy? c. Who were the four main scientists involved in discovering the structure of DNA? d. What did you notice about the process of science represented in the video? Name at least three things that you noticed. Edit View Insert Format Tools Table 12pt v Paragraph v BI Address DELL F4 F5 F6 F7 F8 F9 F10 F11 II 88888: $ & 4. 6. 7

Describe a chromatogram and explain what type of information it contains.

The following densities of water were obtained by Student A: 1.09g/mL, 1.14g/mL, and 1.15g/mL.Determine the average and standard deviation of the density.

Consider the following sets of replicate measurements: (1) Calculate the mean and standard deviation of Group A. (2) Determine the confidence interval at 95% confidence level. Assume the data here are the only knowledge you have and no previous measurements are available.

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 -

Assume the data below was collected for two different sample solutions using the same experimental procedure you carried out. Based on the two lines shown below, which solution (orange data points or blue data points) corresponds to the sample that would look DARKER in terms of how much light goes through the glass. 0.9 y= 4.7713x - 0.0728 R0.99953 0.8 0.7 0.6 0.5 0.4 0.3 0.2 y1.414x - 0.0546 R0.99642 0.1 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 0.1 [Concentration, M] orange data points (lower line) blue data points (upper line) Absorbance

Your Question :help  please answer in text form with proper workings and explanation for each and every part and steps with concept and introduction no AI no copy paste remember answer must be in proper format with all working!

LIMIT TEST (IMPURITIES - BIOLOGICAL) Instructions: Note the color change of each of the samples by writing blue or pink accordingly. Then give inference whether the sample is contaminated or not contaminated upon observation. Answer the highlighted numbers.     BLANK  (Sterile distilled water) Reference Sugar Solution Sample A Sample B REPLICATE 1 BLUE BLUE PINK PINK REPLICATE 2 BLUE PINK BLUE PINK REPLICATE 3 BLUE PINK PINK PINK INFERENCE NOT CONTAMINATED CONTAMINATED 1 2   1. 2. 3. Which of the two samples is relatively clean of biological impurities? 4. Given the result in limit test as an analyst, what will be the final conclusion to this? Write whether rejected or accepted for each sample.  (see attached photo)

What safety rules did Andrew break?

Choose the one correct or one incorrect statement regarding filtration:      gravity filtration uses a Buchner funnel, filtering flask and negative pressure      filter paper should be wet with solvent to seal it to the funnel before filtering      the solution collected in the filtering flask is called the residue      vacuum filtration is most often used to remove impurities from a solution      the solution to be filtered should completely fill the top of a Buchner funnel

Histology stains that are used to create microscopic images originally came from the industry. clothing cosmetics healthcare automotive food

Level = 6ft of water (h20 density = 0.036 Ib/in^3) Find gauge reading in psi = Find gauge reading psig = Find gauge reading in psia =

PLEASE JUST DON'T EXPLAIN IT!! Please answer and solve this question!!