Description If 200. mL of water are poured into the measuring cup, the volume reading is 6.76oz . This indicates that 200.mL and 6.76oz are equivalent. How many milliliters are contained in a fluid ounce based on this data?
Description Watch the videos for this lab, writing down the data shown. For Part A: Density of pre- and post- 1982 pennies, Trial 1 for each set of pennies is shown in the first video [+], and Trial 2 for each set us shown in the second video [+]. Watch each video and record the data into your data table. Then, enter the data into the questions in this assessment. This will give you feedback on the accuracy of your measurements. For Part B: Density of an Unknown Liquid, watch the third video [+], and record data into Data Table B. Instead of Trial 2, we will calculate the density of a 50/50 mixture of the Unknown liquid with water. You can cross out "Trial 2" and write: Mixture. Then record the data in the same data table. We will NOT calculate an average of these values, since they are different liquids. For Part C: Density of CO2 Gas, I will provide data to you so that you can complete the calculations for the Post-Lab questions. Videos:Part A Trial 1: Density of Pennies Trial 1 for pre- and post-1982 pennies [+] Part A Trial 2: Density of Pennies Trial 2 for pre- and post-1982 pennies [+] Part B: Density of an Unknown Liquid, and a 50/50 mixture of Unknown with water. [+] 1.)After recording data from the videos into your data table, enter the following values in the table below Pre-1981 PenniesPost-1983 Pennies Trial 1Trial 2Trial 1Trial 2Total Mass of pennies g g g gVolume of water before pennies added (Vinitial) mL mL mL mLVolume of water after pennies added (Vfinal) mL mL mL mL 2.)After recording data from the videos into your data table, enter the following values in the table below: Unknown LiquidMixtureMass of empty graduated cylinder gMass of graduated cylinder with 10.0 mL liquid g g 3.)For Part C, enter the following values in your data table and use these values to complete the calculations for Part C, below. Mass of dry, empty 125-mL flask with stopper106.1672 gMass of 125-mL flask with CO2 and stopper106.2533 gActual volume for gas inside the flask146.3 mL First, calculate the mass of air inside the empty flask. This air gets pushed out when the dry ice sublimes into CO2(g). When you weigh an “empty” flask, it is not really empty; the flask is filled with air. The mass of this air is generally insignificant when compared to the masses of solids and liquids, but it is significant compared to the mass of other gases, like CO2. When the CO2 sublimates, it displaces the air. To calculate the correct mass for CO2, the mass of the air must be subtracted from the mass of the “empty flask”. Use the measured volume of the flask (above) and the density of air (1.2 g/L) to calculate mass. Note the units! Mass of air in flask: g air Calculate the mass of flask if it were truly empty using the equation below:masstruly empty flask = massempty flask — massair in flask = g truly empty flask Calculate the mass of CO2 in the flask using the equation below:massCO2 = massflask with CO2 — masstruly empty flask = g CO2 Finally, calculate the density (in g/L) of CO2 gas (note units!): Density of CO2 gas: g/L CO2
Description C. Part I Follow-Up Questions (Show all calculations with units on each number and the final answer rounded to the correct significant figures for full credit.) Calculate balloon volume for each balloon at maximum inflation from the circumference data. (You will have to assume that the balloon was a perfect sphere.) To calculate balloon volume, first find the radius (in cm) of the balloon by using the formula C = 2?r. Then, use the radius' value in the formula V = (4/3)?r3 to calculate volume (in cm3). Show all your work, place units on all numbers (even those within the calculations), and express your answers with appropriate sig figs. (12 pts) Calculate the experimental value for the number of moles of CO2 in each balloon at maximum inflation using the formula PV = nRT. Use the volume you calculated in Question 1 at maximum inflation and recall that the gas constant R is 8.206 x 10-2 L atm/mol K. To find the temperature, look at your home thermostat. To find the pressure, use the internet to access the National Weather Service internet website. It will give you the pressure at your location on the day you perform the experiment. [Note: It is essential that your pressure as measured by the barometer be converted from the unit of inHg (inches of mercury) to atm, temperature from oF to K, and volume from cm3 to L before using the ideal gas law and the ideal gas constant.] (12 pts) Calculate the theoretical value for the number of moles of CO2 that should have been produced in each balloonassuming that 1.45 g of NaHCO3 is present in an antacid tablet. Use stoichiometry (a mole ratio conversion must be present) to find your answers (there should be three: one answer for each balloon). (6 pts) The balanced chemical equation for this reaction is: H3C6H5O7(aq) + 3 NaHCO3(aq) ? 3 CO2(g) + 3 H2O(l) + Na3C6H5O7(aq) 4.What is the percent error between the experimental value of moles of CO2 (from Question 2) and the theoretical value of moles of CO2 (from Question 3) for each balloon? (3 pts) 5.How do your experimental and theoretical values compare (discuss percent error from Question 4)? Explain any discrepancies and list TWO sources of error (“human error” and “calculator error” are unacceptable responses; your sources of error should be based on potential flaws in the experimental procedure or design). (6 pts) 6.Graph balloon volume versus the number of tablets used in a line graph. Since the independent variable in this experiment was the number of tablets used, that variable should be plotted on the horizontal axis. The dependent variable was the volume of the balloon; that variable should be plotted on the vertical axis. Be sure to use MS Excel or Graphical Analysis to create your graph and then copy/paste it here. Be sure to include a title for the graph, as well as labels with appropriate units on each axis. (6 pts) 7.Describe the relationship between the number of tablets in the balloon and the volume of the balloon as shown in your graph. (4 pts) C. Part II Follow-Up Questions (Show all calculations with units on each number and the final answer rounded to the correct significant figures for full credit.) Calculate the balloon volume of balloon #1 at both room temperature and at the high temperature using average circumference data. (You will have to assume that the balloon was a perfect sphere.) To calculate balloon volume, first find the radius (in cm) of the balloon by using the formula C = 2?r. Then, use the radius' value in the formula V = (4/3) ?r3 to calculate volume (in cm3). Show all your work, place units on all numbers (even those within the calculations), and express your answers with appropriate sig figs. (8 pts) What happened to the volume of balloon #1 as its temperature increased? Use numerical data from Question 8 to support your response. (4 pts) Explain the results from Part II. Your explanation must discuss the behavior of gas particles. (6 pts) Which gas law does Part II of the lab demonstrate? How do you know? What is the equation associated with this law? (3 pts) Using the law from your answer to Question 11, explain what would happen to a balloon if it were placed in a freezer for 15 minutes. Support your answer with data from the lab and/or content from the lab’s Background Information. (4 pts)
Description Please complete and upload the titration lab to this assignment. 6.9: Acid-Base Titration: Unknown HCl SUBMISSION Follow the experimental procedure and record data into the provided data table. Calculate the average concentration of HCl and record in the data table. Organize and label all calculations on a separate sheet. Upload both this worksheet and the calculations sheet as your submission.
Description Experiment Osmosis & Dialysis OBJECTIVES • Learn how to prepare a solution from a solid or by dilution • Study the effects of different solution concentrations on cells • Learn the differences between dialysis and osmosis Please check the word document for all the in
