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Chemistry

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Feb 20, 2024

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Experiment 4 Enthalpy of Chemical Reactions GRADING RUBRIC EXPERIMENT 4 – LAB REPORT Worksheet (80 pts) Student name: ____Paulina Uribe___ Lab partner name: ___Britney Nguyen___ TA name: ___Rose___ Day & time of the lab: _02/15_ 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. Recorded experimental values and the file name (as saved on your USB drive) 1.3. Observations if any were noted 2. (70 pts) The WORKSHEET 3.1 (22 pts) POST-lab data analysis 3.2 (10 pts) Figures of graphs with captions in the right positions. Tables with captions 3.3 (38 pts) Complete (full sentence) answers to the discussion questions (DQ; Provide well- rounded answers composed with complete sentences for full credit. If you need to refer to any of the data or tables produced during the “Data Analysis” section, clearly indicate their location within your answers for the graders to find them readily.) 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 SP2023
Reaction 1 Reaction 2 Reaction 3 Reaction 4 Reaction 5 Time (s) Temperature °C Time (s) Temperature °C Time (s) Temperature °C Time (s) Temperature °C Time (s) Temperature °C 0 21.4 0 20.5 0 21.1 0 20.9 0 20. 15 21.4 15 20.5 15 20.9 15 20.8 15 20. 30 21.3 30 20.4 30 21 30 20.8 30 20. 45 21.3 45 20.4 45 21 45 20.8 45 20. 60 21.3 60 20.4 60 27.7 60 20.9 60 20. 75 21.2 75 20.5 75 33.3 75 20.7 75 20. 90 31.2 90 21.4 90 33.5 90 20.7 90 20. 105 34.6 105 21.4 105 33.4 105 20.7 105 20. 120 34.7 120 21.4 120 33.2 120 21.6 120 22. 135 34.8 135 21.4 135 33.2 135 23 135 35. 150 34.7 150 21.4 150 33 150 23.7 150 38. 165 34.6 165 21.6 165 33 165 24.4 165 38. 180 34.5 180 21.4 180 33 180 25.3 180 39. 195 26.3 195 39. 210 26.9 210 39. 225 27.9 225 3 240 28.5 240 3 255 29 255 38. 270 29.5 270 38. 285 30 285 38. 300 30.4 300 38. 315 30.5 315 38. 330 30.6 330 38. 345 30.9 345 38. 360 30.9 360 38. 375 31.1 375 38. 390 31.2 390 38. 405 31.3 405 37. 420 31.2 420 37. 435 31.1 435 37. 450 31.2 450 37. 465 31.3 465 37. 480 31.2 480 37. 0 20 40 60 80 100 120 140 160 180 200 0 5 10 15 20 25 30 35 40 Reaction 1 Time Temperature 0 20 40 60 80 100 120 140 160 180 200 19.5 20 20.5 21 21.5 22 Reaction 2 Time Temperture Highest temp: 21.6°C 0 20 40 60 80 100 120 140 160 180 200 0 5 10 15 20 25 30 35 40 Reaction 3 Time Temperature 0 100 200 300 400 500 600 0 5 10 15 20 25 30 35 Reaction 4 Time Temperature 0 100 200 300 400 500 600 0 5 10 15 20 25 30 35 40 45 Reaction 5 Time Temperature Highest temp: 34.8°C Highest temp: 33.5°C Highest temp: 31.3°C Highest temp: 39.2°C 2 P. Sotelo SP2023
3 P. Sotelo SP2023
(22 pts) POST-LAB DATA ANALYSIS Post-lab should contain all work done outside of the lab, especially sample calculations for every type of math operation, as detailed in the DATA ANALYSIS in reference to DQs . You may choose to show your work in the post-lab notebook pages or typed in the data analysis and discussion portions of the worksheet. PART B: The Reaction of Hydrochloric Acid and Ammonium Hydroxide The following steps will guide you on how to proceed with data analysis using the software of your choice, Excel or LoggerPro: 1. If you choose to use Excel , open your file (.txt) from Part B in Excel. 4 P. Sotelo SP2023
a. Open Excel and select the “data” tab. b. Select the “From Text” action, and select the desired file to import. c. Excel should automatically identify your data as “Delimited”. Ensure that this is the selected file type and click “Finish”. d. Some versions of Excel will import data sets without retaining their numerical values (your data will not be erased, but Excel will treat numbers as letters). Data cannot be analyzed in this state. To convert the text into values, select a column, and click “Text to Columns” under the Data tab. Numbers that are successfully converted to values will be aligned on the right side of the cell. Generate a new graph for each reaction. e. Highlight the desired data set, select “Insert” from the task bar in the top left, then select “Insert Scatter”. f. From the “Design” tab, you can change the name of an axis by selecting “Add Chart Element”, then “Axis Titles”. g. Ensure that each graph (three total) plots Time on the x-axis and Temperature on the y-axis. h. Identify the maximum temperature value for each reaction and label it on its graph. i. Add an appropriate title to each graph by selecting “Add Chart Element”, then “Chart Title”. If you choose to use Logger Pro 3.14, open the (.txt or .qmbl) file saved on your USB drive from Part B. To generate a new graph for each reaction: Select “Insert” from the task bar in the top left, then select “ Graph ”. o You can change the name (and corresponding data of) an axis by simply left - clicking on it and selecting the desired option from the drop-down menu. To toggle between the temperature readings from each different reaction, click on the y-axis title (Temperature) to access the drop-down menu, then select “More” to see options for each individual run. o Ensure that each graph (three total) plots Time on the x-axis and Temperature on the y-axis. o Select “Analyze” and “Statistics” to add a statistics legend to each graph. o Add an appropriate title to each graph by right -clicking on the graph and selecting “Graph Options”. o Copy and paste all three graphs into the R&D section of the report. (2 pts/each) FIGURES (five total) Figure 1: (insert caption below the figure) 5 P. Sotelo SP2023
0 20 40 60 80 100 120 140 160 180 200 0 5 10 15 20 25 30 35 40 Reaction 1 Time Temperature Figure 1: The reaction of Hydrochloric acid and Sodium Hydroxide had a maximum temperature of 34.8°C at 135 seconds. Figure 2: 0 20 40 60 80 100 120 140 160 180 200 19.5 20 20.5 21 21.5 22 Reaction 2 Time Temperture Figure 2: The reaction of Sodium Hydroxide and Ammonium Chloride had a maximum temperature of 21.6°C at 165 seconds. Figure 3: 6 P. Sotelo SP2023 Highest temp: 34.8°C
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