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Graphing and Data Analysis in Chemistry How many licks does it take to get to the center of a dumdum? Procedure: 1. Open Excel on a computer at your lab station. 2. Create a data table with the following information: a. In Cell A1: Number of licks b. In Cell B1: The name of one lab partner c. In Cell C1: The name of the next partner d. In Cell D1: The name of the next partner e. In Cell E1: Average f. In cells A2 down place the numbers: 0, 20, 40, 60, 80, 100 until you reach 200 3. Obtain a dumdum lollipop for each student. Mass the pop with the wrapper on. Record in the data table as the mass of 0 licks. 4. Remove the pop from the wrapper, do NOT throw out the wrapper. 5. Lick the lollipop 20 times. It doesn’t matter what you call a “lick” as long as you are consistent. 6. Place the pop on the wrapper and mass it again. 7. Lick the lollipop 20 more times. 8. Place the pop on the wrapper and mass it again. 9. Repeat for 200 total licks (10 masses). 10. Finish the lollipop and mass the empty wrapper and stick. Record this mass on a separate sheet. Data Analysis: 1. To fill in the “average” column. Type the following equation into cell E2: =average(B2,C2,D2) When you hit enter, the average value should appear. 2. To copy the equation for the rest of the sheet, click on cell E2 again. A green box should appear around it. There is a small square in the lower right corner. If you place your cursor above it, the cursor will change to a black +. When it does this click and drag down until you have filled in the column. 3. Create an xy scatter plot of your data by: a. Click on cell A1 and drag down to the lower right cell with data in it. The area on the table that you have typed in should now be highlighted grey. b. Click the “Insert” tab at the top of the screen. Next to the words “Recommended Charts” is this ion: . Click and a drop down menu will appear. Choose the option that has data points connected by a smooth curve as shown highlighted in the picture to the right. c. On the menu bar at the top of the screen, click on the Quick Layout option, and choose Layout One, so that you have axis titles. d. Double click on the words “Axis title” and type in the appropriate title for the both the X and Y axes. Also change the Chart title. e. You are now going to extend your average value line on the graph so that they cross the x axis. This will allow us to graphically determine the number of licks to finish the lollipop. f. Right click on the “Average” line on your graph. On the pop-up menu, choose “Add Trendline”. g. You will need to Forecast the line forward until it crosses the axis. You will need to use an educated guess as to how many “periods” you must go forward to hit the axis. If your estimation is too short or too long, change it. The forecast line does not need to hit exactly on the line, but should be close, or a little over. h. Print the graph only. To ensure that the graph prints on the whole page, make sure that you have clicked somewhere on the graph before choosing to print. Look at print preview first! If the preview shows the data table and graph, go back and choose the graph only! Questions – Complete on the graph. Use the back of the graph if needed. 1. Are the number of licks to get to the end of the lollipop equal to the number of licks when the mass is equal to zero. Explain your answer. 2. Considering question #1, how many licks would it take to finish the lollipop? Use your graph and explain how you reached your answer. 3. Which of your lab partners would finish their lollipop the fastest? The slowest? How did you determine this?