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- 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) Absorbance1. 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?What is Donnan's theory? What is its importance in biophysical chemistry?
- A sample is dissolved in water and analyzed using spectrophotometry. The sample shows an absorbance peak at a wavelength of 486 nm. Which one of the following adjustments would increase the absorption at that wavelength? O Diluting the sample with additional water. O Evaporating some of the water from the sample. Decreasing the path length, b. the light takes through the sample. Re-measuring the absorbance of the blank (water).Consider four distinct physical properties: boiling point, melting point, solubility, and density. Which of these physical properties do you think allows thin layer chromatography (TLC) to work? Choose one then, explain your reasoning.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.
- 2. The goal behind suction filtration is to remove soluble impurities that are on the surface of the crystals. Therefore, why can't you simply use suction filtration instead of recrystallization to purify an impure solid?1. Write a report comparing the principles, limitations/capabilities of the following microscopic techniques. (a) Optical Microscopy(b) Scanning Electron Microscopy(c) Transmission Electron Microscopy(d) Atomic Force MicroscopyWho is the father of the microscope?
- a student ran a TLC plate with three different molecules that have the same carbon structure but each contain a different functional groups. Help the student match the compounds to the correct lane of the TLC plateCan paper chromatographt be used to separate and identify very volatile substances? Explain.PAPER CROMATOGRAPHY • Define chromatography • Demonstrate an understanding of the process of chromatography • Describe the steps involved in a chromatography investigation Explanation Coloured inks are often made up of several different inks. Each colour of ink will get carried a different distance by the water, allowing you to see all of the different inks. Try this with different colours to see what actually goes into a colour. This technique is called chromatography and can be used in chemistry to find out what is in an unknown mixture. II. Materials .Felt tip pens (non-washable) . Kitchen roll .A bowl or cup . Water • Scissors III. Health and safety • Make sure that you thoroughly clean any equipment after the experiment before using for food IV. Procedure Method 1 1. Take a sheet of kitchen roll and draw a simple picture with a non-washable felt tip pen. 2. Place the sheet over an empty bowl. This is to keep the paper from getting too wet. 3. Carefully add a few drops of water…