Chm 2045L Lab 2 Data Tables And Plotting Objectives

Chm 2045l Lab 2 Data Tables And Plotting Lab Dataobjectiveslea

Chm 2045L Lab 2: Data Tables and Plotting Lab Data Objectives: Learn how to make a data table. Learn how to plot lab data, including titles, labels, and best-fit straight line. Data Tables: When making data tables, the following are required: Title: A few words to briefly describe the type of information in the table. If more than 1 table is present, number the tables. For example, Table 1. Data for Lab 4: Determining the formula for a compound. Table 2. Summary %Cu and %Cl in copper chloride compounds. The 1st row of the table should be a header row and contain titles for each column. If there are units associated with the values, include those in parentheses. When possible, try to not to have tables spread over 1 page. For large tables this may not be avoidable, in which case make sure to include the header row at the top of the table on each page. Plotting Data (also known as Graphing Data): When graphing scientific data, there are several things that must be included in addition to plotting the data points, such as a title and axes labels including any applicable units. In this lab we will cover the basics of what is required for graphs you will be making in this and subsequent chemistry labs. When plotting data points, typically the 1st column is the value for the x-axis (horizontal axis) and the 2nd column is the value for the y-axis (vertical axis). Some lab data may require they be switched so that the slope of the best-fit data line gives a desired result. For example, plotting mass on a y-axis and volume on an x-axis would result in a slope that gives the density of the substance. Every graph or plot should have a title that clearly states what type of data is being shown. In axes should also be labeled with what is being measured as well as the units used to measure. For example, an axes may be labeled volume (in mL) or as volume, mL. Both ways are acceptable and are often used. After data points are plotted, it’s often necessary to find the best-fit straight line. This should be a straight line that is drawn as close to the points as possible and usually doesn’t not include all of the data points. Figure 1 shows an example of a best-fit straight line. Figure 1. Sample best-fit straight line. Equation for a best-fit line: A line has the equation: y=mx+b where: y = vertical axis value (also known as the ordinate) x = horizontal axis value (also known as the abscissa). m = slope, which may be found using x and y values from 2 places on the best-fit straight line. Ideally these 2 places on the line should not be close together. Slope = (y2-y1)/(x2-x1). The units of the slope depend on the units of the y- and x-axes. b = y-intercept (the value of y where x=0). V o lu m e ( m L) Pressure (mm Hg) Sample Data Plot Name: ___________________________ Procedure: For each of the following sections, follow the directions to graph the data. The graphs and answered questions will count as your lab report for this lab. Each student must turn in their own graphs and answers to the questions. You must do the graph for #1 by hand using graph paper, a ruler, and calculator. For #2 and #3 you may either do them by hand or using a spreadsheet like Excel, but you must print out your spreadsheets as well as your graphs. 1. Given the following data from a gas experiment measuring changes in volume in response to increasing the temperature: Data for #1. Temperature (oC) Volume (L) 20.0 1..0 3..0 5..0 5..0 6..0 8..0 12.29 a. Plot the points on a graph. b. Draw a best-fit straight line. c. Calculate the slope. d. Calculate the y-intercept. e. At what temperature would the volume = 1.50L? f. At what volume would the temperature = 125.0 oC? g. What is the equation for the line? 2. Given the following data, graph mass vs. volume so the slope will give the density of the substance. Data for #2. Volume (mL) Mass (g) 0.50 4..00 7..40 10..00 11..80 22..81 30.1 a. What would the volume be at 25.0g? b. Draw the best-fit straight line and write the equation for the line on the graph. c. What is the slope of the graph? d. Using the table at the end of this lab to identify the metal. 3. Given the following non-linear data, plot pressure along the y-axis and 1/volume along the x-axis. Data for #3. Volume (mL) Pressure (torr) 42.........2 1200 a. Draw the best-fit straight line. b. Write the equation for best-fit straight line. c. What is the slope of the line? Table of metallic densities for #2. Element Density g/mL Aluminum 2.70 Antimony 6.68 Barium 3.62 Brass 8.55 Bronze 8.20 Chromium 7.15 Copper 8.96 Gold 19.3 Iron 7.87 Lead 11.3 Magnesium 1.74 Nickel 8.90 Platinum 21.5 Rhodium 12.4 Silver 10.5 Tin 7.26 Titanium 4.51 Tungsten 19.3 Zinc 7.14 Zirconium 6.52 Due Date: By 11:59 p.m. EST, Wednesday, of Unit 6 Points: 100 Overview: Covey’s 7th habit, Sharpening the Saw, is all about keeping your personal self “sharp.†It means regularly renewing and strengthening the four key dimensions of your life: your body, your brain, your heart, and your soul. You can’t even think about sharpening the saw when you’re always busy sawing. • What is something you’d work on improving if you had the time? • What is the best way to balanceâ¯your brain? Body? Heart? Soul? • What are some ways you can keep your saw sharp while in school and then also in your profession? Requirements: • Eachâ¯journal is meant to be an ongoing individual conversation betweenâ¯you andâ¯your instructor during the week. • All conversations in the journal are strictly between you and your instructor and cannot be seen by other students. Be sure to read the criteria below by which your work will be evaluated before you write and again after you write. Evaluation Rubric for Sharpening the Saw Journal CRITERIA Did not meet expectations Needs improve ment Competent Meets or exceeds expectations (0–23 points) (24–29 points) (30–35 points) (36–40 points) Content Reflection Reflection states only what was read or heard in class without Reflection raises ideas from the coursework with limited Reflection shares the meaning you place on coursework Reflection reveals critical thinking about course ideas and concepts CTC101 – College Success Seminar Unit 6 Journal: Sharpening the Saw any further development. sharing about what it means to you and what you think about the ideas. experiences and how they connect to support your success. that connect the meaning of the ideas and ways to make them work for you in college and life. (0–17 points) (18–22 points) (23–26 points) (27–30 points) Personal Growth Inadequate evidence of reflection. Limited evidence of reflection on own work with a personal application and connection to learning. Evidence of reflection on own work with a personal application and connection to learning. Strong evidence of reflection on own work with a personal application and connection to learning. (0–11 points) (12–14 points) (15–17 points) (18–20 points) Writing Quality Poor writing style lacking in standard English, clarity, and lan guage used and/or frequent errors in grammar, punctuation, usage, and spelling. Needs work. Average and/or casual writing style that is sometimes unclear and/or with some errors in grammar, punctuation, usage, and spelling. Above-average writing style and logically organized using standard English with minor errors in grammar, punctuation, usage, and spelling. Well written and clearly organized using standard English, characterized by elements of a strong writing style, and free from grammar, punctuation, usage, and spelling errors. (0 points) (5 points) (7 points) (10 points) Timely Participation Initial journal entry was submitted after Sunday. Initial journal entry was submitted by Sunday. Initial journal entry was submitted by Friday. Initial journal entry was submitted by Wednesday.