ࡱ> dfc "bjbj~~ $XZ%#   8W4b+//"QQQIII+++++++ -/+ I'"IIM+ QQ+   Q8Q Q+ I+  e& 'ϥj&'<2+0b+ '|0 |0('  'III :   E-10 Name: Beverage Density Lab Data Table: Known SamplesMass (data)Density (calc)BeveragesMass (data)Density (calc)% Sugar (analysis 2)Calories in 1 serving: _____ mL (analysis 4)Calories per mL (analysis 4)0%Cola5%Diet cola10%Grape juice15%Grape soda20%Powerade Analysis: 1. We will make a GRAPH in computer lab Monday. See WB pg52, the rubric (other side) & the booklet pg12 for guidance. 2. Mark the approximate sugar contents of the beverages on the graph using known densities. (see WB p51), Mark on Data Table. 3. Rank beverages by sugar content: _____________ _____________ _______________ ______________ ______________ Most sugar 2nd 3rd 4th least 4. Calculate Calories per mL for each beverage. Record in DATA TABLE. (Cal. in 1 serving the # of mL in one serving) Is sugar content directly proportional to calorie count? Yes or No Why? _____________________________________ Questions: 2. Pure water has a density of 1.00 g/mL at 4 oC. Was your room temperature value for the density of water (0%) higher or lower than 1.00? Why do you think the density value was off in that direction (Hint: think about how temperature may affect the variables used to determine the density may be affected by temperature changes). Calculated Water density = Why was it not 1.00 g/ml? 3. In this lab, you discarded all the liquids into the sink. When would this not be appropriate? What liquids should not be discarded in the sink? When can you NOT discard liquids down the sink? ________ Name 3 Liquids that can NOT go down the sink. ____ 4. This lab uses density to approximate sugar content in beverages. What assumption does the lab make about the other ingredients in the beverages? ________________________________ _________ 5. Look at the various pieces of glassware used to measure volume in the laboratory. How does the diameter seem to affect the precision of the measuring instrument? 6. Give 2 reasons why the pipette is more precise than a graduated cylinder. Conclusion: Write out your conclusion in full sentences on a separate piece of graph paper. Address all 4 lab purposes and give 2 likely sources of error. See the rubric on the other side and the booklet page 7 for guidance. Make sure you arent telling me that you learned something, explain WHAT you learned and give data/examples to back up statements. Sources of error are possible design flaws or procedural errors that would unintentionally affect lab results. Mind Prober: 1. Imagine you are at a picnic and there are cans of diet and regular cola in a cooler of ice water. Where (at the top or bottom of the cooler) would you find each beverage? - top = - bottom = 2. How would you make a 10% sugar solution? (Exactly how much sugar & water would you use?) - how much sugar = - how much water = E10 Lab Rubric Prelab: (15 total)POINTS EARNEDHeading (Title, name, date) All 4 prelab questions answered correctly in full sentences restating ? Purposes Procedure (clear, but not word-for-word)Data & Calculations (30 total)---------------------All data & calculations have units labeled, are complete & logical All data & calculations are reported with correct significant figuresGraph & Analysis (25 total)---------------------Axes and units are labeled Title box is present (y vs x) Scales are logical, graph is FULL page size Data points are correctly plotted, with error circles. Intersections of known % sugars & each beverage are circled & labeled. #3 is answered on worksheet. #4 is answered on data table AND completed on worksheet.Questions (10 total)---------------------All answers are correct. All parts of each question are answered.Conclusion (20 total)----------------------The conclusion is in complete sentences. avoids personal pronouns (I, you, we, me, etc.) Addresses ALL of the purposes Tell me what the correct formula for DENSITY is. Explain how you constructed a calibration curve (refer to graph). What data went into it? Include RESULTS to support statements. Explain HOW you used the calibration curve to determine the % sugar in the 5 beverages. Include results to support statements. Tell me two things that would have been experimental errors and how they each would have affected results. (2 SOURCES OF ERROR)Mind Prober (10 total) BOTH are answered thoughtfully on the worksheet.  Total Points earned above: _________ / 100 Standard penalties Lab not in ink (& no red pen) - 10 _____ Lab not on graph paper - 10 _____ (except for typed/printed portions) Lab LATE (due end of class Mon 10/3 -20 per day _____ Messy/ disorganized up to -10pts _____ No prelab stamp - 5 _____ How to make a graph using Excel Open Excel. Click on Excel workbook icon. In cell A1 type mass percent. Starting in cell A2 and moving downward, enter in the data for the independent variable (0, 5, 10, 15, & 20%). In cell B1 type density. Starting in cell B2 and moving downward, enter in the data for the dependent variable (density for the 5 sugar solutions in this lab). Click and drag to highlight all data. Next, click on the Chart Wizard Icon. When step 1 Chart Type box appears, choose XY Scatter graph. Hit enter. The graph should appear as step 2. Hit enter again. When step 3 Chart Options appears, type in your name as the title, then hit tab key and type in the name of the independent variable (% sugar), then hit the tab key again and type the name of the dependent variable (density g/mL). Click on the finish icon. At this point the graph should appear on the same page as your data. Click on the word Chart at the top of the screen and highlight add trendline. Choose linear when the menu box appears. Click on the options tab. Click on the boxes for display equation on chart and display R-squared value on chart. Hit the enter key. At this point the graph should re-appear on the same page as your data. After your teacher checks your graph, then you can print a copy. Then continue on #2 of the analysis for the lab.     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