E2_gas_laws_worksheet_SP2024

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University of Texas *

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204204

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Chemistry

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Feb 20, 2024

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Experiment 2 Gas Laws EXPERIMENT 2 – LAB REPORT Worksheet (80 pts) Student name: _____________________________________ TA name: _________________________________________ Day & time of the lab: _______________________________ The lab report packet for this experiment should consist of the following in THIS ORDER: The lab report packet for this experiment should consist of the following: 1. (10 pts) IN-lab notebook pages 1.1. Experimental procedure 1.2. Observations that were noted and exact data file name (as saved from the LabQuest) 2. (70 pts) The WORKSHEET 2.1. (65 pts) Complete (full sentence) answers to ALL the discussion questions (DQ) and Data Analysis Section. 2.2. (5 pts ) POST-lab notebook pages 2.2.1. All calculations performed present Complete this worksheet and turn in your digital lab packet to Canvas. Feel free to adjust space in this document as needed. The tables provided here are only an example of these may look like, feel free to replace the entire tables with your own creations using Excel, etc All tables and figures (graphs) must be accompanied by captions which should be positioned above tables and below figures. TURN IN the digital copy to Canvas on the due date by 11:59 pm. All electronic material must be completed by the due date to avoid late penalties. 1 P. Sotelo SP2024

IN-LAB NOTEBOOK PAGES (10 pts) Name, date, title of experiment, detailed procedure, observations and data taken while in lab. Upload scans or images of your written in-lab notebook pages here. DATA ANALYSIS For all calculations in this worksheet report the pressure and k values to 4 significant digits. See the lab manual post lab data analysis section for specific instructions on how to create the figures and get the data for the discussion questions. (5 pts/ea.) Copy and paste the two figures you created for Part A and Part B below. Make sure they have all the necessary components of a properly formatted figure. (See the document on canvas titled Report composition tips). Figure 1: here… Figure 2: here… 2 P. Sotelo SP2024

DISCUSSION QUESTIONS (Answer the following questions in full sentences .) Part A 1. (8 pts) Describe the relationship between the pressure and the volume of a confined gaseous sample. What equation is used to best describe this relationship? Use that equation and the values obtained from Step 5 of the Data Analysis to complete Table 1 below. Table 1 : Pressure readings and calculated k Part A values at each specified volume. Volume, V (mL) Pressure, P (kPa) Constant, k Part A ( appropriate units) 5.8 7.8 9.8 11.8 Etc. 2. (4 pts) Calculate an average of the values of k Part A from the table above. In this study, what are the appropriate units of k Part A ? 3. (4 pts) Using the equation from Discussion Question 1 and value of k Part A from Discussion Question 2, calculate the expected pressure of the gaseous sample at a volume of 2.5 mL. Calculate the pressure at a volume of 40 mL. 4. (8 pts) Compare the pressures at volumes of 2.5 and 5 mL. Compare the pressures at 2.5 and 10 mL. Compare the pressures at 2.5 and 40 mL. For each comparison, what is the numerical factor by which each variable increases or decreases? Do these results make sense? 5. (4 pts) Compare your average k Part A to the slope of your trendline in Figure 1 . Describe in detail one or more sources of experimental error from this part of the lab. Part B 6. (9 pts) Describe the relationship between the pressure and the temperature of a confined gaseous sample. What is the general equation that can be used to best describe this relationship? Use that equation and the values obtained from Step 14 of the Data Analysis to complete Table 2 . What is the experiment specific equation (see the trendline) that can be used to describe this relationship (with the exact values of m and b)? 3 P. Sotelo SP2024

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Table 2 : Pressure readings and calculated k Part B values at each specified temperature. Temperature, T (K) Pressure, P (kPa) Constant, k Part B ( appropriate units ) 300 320 340 360 7. (4 pts) Using the table from DQ 5 , calculate an average of the four values of k Part B from the table above. In this study, what are the appropriate units of k Part B ? 8. (6 pts) Using the general equation from DQ 5 , and value of k Part B from Discussion Question 6, calculate the expected pressure of the gaseous sample at a temperature of –50 °C. Calculate the pressure at a temperature of 200 °C. 9. (8 pts) Calculate these two new pressures using the specific equation found in DQ 5 (the equation for the trendline on the Part B graph). What are the expected pressures at –50 °C and 200 °C using this method? Are they similar to the calculated pressures from Discussion Question 7? Describe in detail one or more sources of experimental error within the experiment that might account for any discrepancies. 4 P. Sotelo SP2024

(5 pts) POST-LAB NOTEBOOK PAGES For the post lab notebook pages, you must show a sample calculation of each unique calculation completed during the data analysis and discussion questions. 5 P. Sotelo SP2024