Prelab for Experiment 6 Chromatography of Kool Aid

The Covid-19 pandemic has many experts commenting on the science associated with the virus - origins, vaccines, monoclonal antibodies, masks, social distancing.  It is important to consider what the experts say, but to also evaluate their statements.  We will start with the scientific method.  I want you to outline the scientific method from what you have been taught in previous classes.  You can list steps, parts, process, short descriptions, whatever.  If not taught in previous classes, then you will make your best guess about it.

What is the difference between precision and accuracy in analytical chemistry? Give an example from everyday life

Suppose some measurements are made on two different homogeneous stones to find out if they are made of the same kind of rock. The mass and volume measurements are listed below. Are the two stones the same type of rock? Why or why not? Show all calculations. Mass Volume Calculations Stone 1 58.0 g 20.0 cm Stone 2 50.1 g 15.0 cm3 21/common/assets/pdfjs/1.0.0.30/web/viewer.ht...ndered-pdf&fullscreen=Dd21-fileviewer-rendered-pdf-dialog&height=746#0

On a dry day, your hair flies apart when you brush it. How would you explain this?Match the words in the left column to the appropriate blanks in the sentences on the right.

A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of glycerol, pentane, acetone, tetrahydrofuran, and dimethyl sulfoxide. The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from his collection of Material Safety Data Sheets (MSDS), the chemist finds the following information: liquid density glycerol 1.3 g•cm pentane - 3 0.63 g·cm 3 0.79 g·cm аcetone tetrahydrofuran 3 0.89 g·cm dimethyl sulfoxide 1.1 g·cm Next, the chemist measures the volume of the unknown liquid as 0.683 L and the mass of the unknown liquid as 752. g. Calculate the density of the liquid. Be sure -3 Ox10 your answer has the correct number of significant digits. 1101 g·cm Given the data above, is it possible to identify the liquid? yes no

While creating a piece of art work, a student becomes curious about the ink he is using to create his art. He wonders if the in is a pure substance or a mixture. The ink appears to be uniform throughout, but separates when a chromatography experimer is performed on it, leaving multiple marks of different colors along the chromatography paper. Using his observations of the properties of the ink, the student can classify it as a heterogeneous mixture. solution. compound. element.

Now it's time to create, analyze and interpret a Chemistry-based graph! Let's do this in steps. Data Measurement number Temperature (°C) Solubility (g NaCl/100 g water) 1 0.00 35.2 2 20.0 36.1 3 40.0 37.0 4 60.0 37.7 5 80.0 38.4 100.0 39.0 Let's assume that you just finished your first research laboratory experiment and you collected the data listed above. Pay close attention to the titles. Based on the titles listed answer and complete the following: a. What would be the title of the graph? b. What set of data would you place on the y-axis? This is your dependent variable-measurable variable whose value depends on the independent variable. c. What set of data would you place on the x-axis? This is your independent variable-measurable variable of which when changed, the value of the dependent variable changes. d. Based on the data listed above, use the following site to make a Line Graph of the data listed above and turn it in here. e. Give a detailed CER writing response to the…

CHEMISTRY 3A---WORKSHEET 2 CHAPTERS 1 AND 8 1. The different colors of light have different wavelengths. The human eye is most sensitive to light whose wavelength is 555 nm (greenish-yellow). What is this wavelength in millimeters? A tun consists of four hogsheads, one hogshead is 0.500 butt, and one butt is 126 gal. How many liters are equal to 1.00 tun? 2. A day on Jupiter is 3.543 x 104 seconds long. How many earth days are equal to one day on Jupiter? 3. 4. The human body is 0.0040% iron. How many milligrams of iron does a 165 pound person contain?

A A Monate ab 4 Paragraph Help Search (Alt+Q) No Spacing Heading 1 Editing Dictate Sensitivity Voice Sensitwity Styles Two methods of separating an undissolved solid from a liquid are and The method for separating a dissolved solid from the water in an aqueous solution 15 • Using a solvent to dissolve only one substance in a mixture is called 2. A mixture can consist of two or more pure substances. Does that mean a mixture can only consist of elements? 3. Explain your answer to question number 2 4. Oil and water mixed together form a heterogenous or homogenous mixture? 5. 2.000 g of the unknown mixture was placed in an evaporating dish. The empty evaporating dish weighs 38.135 g. After subliming the ammonium chloride from the mixture, the evaporating dish and the remaining mixture weighs 39.775 g. (Put your answer in 3 sig figs and show your work) • What is the weight of the ammonium chloride? • What is the percent of ammonium chloride in the sample? Normal 1. Fill in the following…

What are fibers and where are they found?  How could forensic scientists use fibers to solve a crime? Define the word probative.  What is the probative value of your unknown fiber identities, for a forensic investigation? Starting from the crime scene, explain the steps you would follow to collect, preserve, and identify fiber evidence. Which of the 6 fiber types are natural? Which are man-made? Are fibers classified or individualized?  Why? What is the identity of your assigned unknown?

A 106.2 mL sample of 0.100 M methylamine ( CH3NH2; Kb = 3.7 x 10-4) is titrated with 0.235 M HNO3. Calculate the pH after the addition of each of the following volumes of acid.

After creating her standard curve for absorption versus the concentration (M) of FD&C Red 40 and processing her data, Sally found that her drinking strength Kool-Aid sample had a concentration of 4.692 x 10–5 M. If 0.132 grams of Kool-Aid powder was used to prepare an 8-fl oz cup of her assigned flavor, what is the percent by mass of FD&C Red 40 in her Kool-aid powder? Report your answer as a percentage with two places after the decimal. Do not include the percentage sign in your answer. Pay attention to units. You are trying to find the mass percentage of red dye, so you need to know each variable in the equation in Appendix B. Note that the percent by mass equation should be multiplied by 100. There may be some useful conversion factors in the experimental procedure.