Creating and Interpreting Graphs

uvqqrrrra1234
timer Asked: Dec 6th, 2015

Question Description

This is a laboratory paper i need to be done ASAP. I will attach two files that will explain what exactly needs to be done!

lab_unit_3.doc
instructions.docx

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Name: Date: Graded Assignment Lab Report Answer each question, using complete sentences. When you have finished, submit this assignment to your teacher by the due date for full credit. (6 points) 1. Which variable did you choose for the independent variable? Which variable did you choose for the dependent variable? Explain. Score Answer: (12 points) 2. How did the final temperature of the hot water alone compare to the other two trials? If you had to add cream to your coffee, when is the best time to add it so that you have the warmest possible coffee after 15 minutes? Explain your answer using your data. Include your data sheet and the graph of your data in your answer. Answer: Score (7 points) 3. How might you describe the cooling curve for the hot water alone? Was it linear or nonlinear? How about the cooling curve for the other trials? Score Answer: Your Score ___ of 25 Laboratory: Creating and Interpreting Graphs Laboratory Instructions Question Suppose you pour yourself a cup of coffee and are about to add cream. Suddenly you realize you must do something else for fifteen minutes. Should you add the cream before you leave or when you return, to drink coffee that is as hot as possible? Observe You have probably felt the sensation of radiated warmth if your hand is alongside a hot object but not touching it. Have you ever noticed that as the object cools, it does not warm your hand nearly as much? If so, you observed that the rate a hot object transfers heat to its surroundings depends on the object's temperature. Similarly, how fast hot water transfers heat to its surroundings, and therefore how fast it cools, depends on its temperature. Hypothesize Write a hypothesis in the form of an if-then statement regarding when cold water is added to the hot water and the final temperature of the mixed water. Materials Supplied • • • • • • • • Student Guide Graph Paper Laboratory Guidelines funnel stopwatch goggles, safety thermometer, advanced graduated cylinder (250 mL) Also Needed • • • • • • ruler, standard pencils, colored household objects – water household objects – oven mitt or potholder household objects – coffee mugs able to hold at least 250 mL – 2 household objects – stove-safe or microwave-safe container for boiling water Advance Prep (3 days) Review the list of materials for the lab prior to the lesson, because there are several items that you must supply. Safety Review the Laboratory Guidelines before conducting the lab. Experiment: Gather Data Regarding the Cooling Liquid Procedure 1. Prepare a data sheet like the one shown. Have it ready for recording data. 2. Fill a coffee mug with cold water and place it in the refrigerator. Allow at least 30 minutes for the water to cool to the refrigerator temperature. Take a temperature reading of the cold water, and record the temperature at the bottom of the data sheet. 3. Boil water on the stove or in the microwave. (You will need at least 250 mL after boiling.) 4. Measure out 230 mL of the hot water with the graduated cylinder and pour it into a second coffee mug. 5. Place the thermometer in the coffee mug. 6. Read the thermometer. When the temperature of the water reaches 80°C, start the stopwatch and take temperature readings every 30 s for 15 min. Record the data in the table of the data sheet. • Note: You want the initial temperature of the water in the coffee cup to be above 85°C and falling before you start taking your measurements. The empty coffee cup at room temperature may absorb enough heat from the boiling water so that your thermometer never reads above 85°C. If that is the case, empty the water from the coffee cup into the container in which you boiled the water, reboil the water, and repeat Steps 4–6. 7. Repeat Steps 3–6, but use 200 mL of hot water and add 30 mL of the cold water immediately after the 2 minute temperature reading. Place the mug of cold water back in the refrigerator as soon as possible to prepare for the next set of data. 8. Repeat Steps 3–6, but use 200 mL of hot water and add 30 mL of the cold water immediately after the 12minute temperature reading. Time (min) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 Temp. of Hot Water Alone (°C) Temp. of Hot Water When Cold Water Is Added at 2 Min (°C) Temp. of Hot Water When Cold Water Is Added at 12 Min (°C) Time (min) Temp. of Hot Water Alone (°C) Temp. of Hot Water When Cold Water Is Added at 2 Min (°C) Temp. of Hot Water When Cold Water Is Added at 12 Min (°C) 12.5 13 13.5 14 14.5 15 Temperature of 30 mL of cold water = __________°C Experiment: Draw Your Graph Procedure 1. Draw horizontal and vertical axes on your graph paper. • • Which variable did you control, time or temperature? The variable that you controlled was the independent variable and will go on the x-axis (horizontal axis). Which variable did you measure, time or temperature? The variable that you measured was the dependent variable and will go on the y-axis (vertical axis). 2. Look at the range of data of the independent variable. Based on your data, decide on a scale that will go from the minimum value of the independent variable data to the maximum value in even increments. You may want to round the scale up to the nearest convenient value. 3. Label the x-axis with the independent variable and its units. 4. Look at the range of data of the dependent variable. Decide on a scale that will go from the minimum value of the dependent variable data to the maximum value in even increments that make tick marks fall right on graph paper lines. You may want to number every other graph line, or every fifth graph line, or every tenth. Choose what works best for your data. 5. Label the y-axis with the dependent variable and its units. 6. For each trial, plot the same data on the graph. Use a different color to plot the data points for each trial. Draw a smooth trend line for each set of data that approximates the direction of the data points. 7. Write a title for your graph. Be sure that your graph is dark and clear enough to be scanned. 8. Add a legend or label the three different trend lines to show which one is which.
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