complete the lab

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complete the lab as complete sentence

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Pre-Lab Questions: 1. In your own words, describe how to calculate density. Click here to enter text. 2. Explain why the metric system is used in science. Click here to enter text. 3. In any given experiment, how is it possible for your experimental technique to be both accurate and precise? Click here to enter text. 4. If you are changing M to cm, what direction do you move the decimal point? Experiment 1: Metric Measurement Lab Table 1: Length of Materials Material Diameter of penny Height of counter/table Width of textbook Length of room Meters (m) 0.01905m 0.762m 0.219 2.4m to 3.6m Centimeters (cm) Millimeters (mm) Kilometers (km) 1.905 19.05 1.905*10^-5 Click here to enter Click here to enter 7.62*10^-4 text. text. 21.9cm 219mm 2.19*10^-4 240cm to 360cm 2400mm to 0.24km to 0.36km 3600mm Table 2: Mass of Materials Material Grams (g) Centigrams (cg) Milligrams (mg) Kilograms (kg) Mass of a penny 2.5g 250cg 2500mg 2.5*10^-3 258cg 2580mg 2.58*10^-3 3650cg 2,580,000mg 0.0365 Mass of empty 10 ml graduated 2.58g cylinder Mass of 10 mL graduated cylinder with 10 mL water 36.5g Mass of a pencil 8kg 800cg 8000mg 8*10^-3 Table 3: Volume of Materials Volume Liters (L) Centiliters (cL) Millileters (mL) Kiloleters (kL) 2 mL 0.002 0.2 2 0.000002 5 mL 0.005 0.5 5 0.000005 6 mL 0.006 0.6 6 0.000006 9 mL 0.009 0.9 9 0.000009 Post-Lab Questions 1. In the metric system what unit of measurement is used for volume? Click here to enter text. 2. Describe the table that you measured and how the measurement was conducted. Click here to enter text. 3. Why were you asked to use a 10 mL graduated cylinder to measure volume instead of a 250 mL beaker? Click here to enter text. 4. Describe the room you measured and how the measurement was conducted. Click here to enter text.Experiment 2: Density of a Gummy Bear Table 4A: Day 1 Mass Data Materials Grams (g) A. Weight of Paper Towel 2.1g B. Weight of Paper Towel with Gummy Bear Weight of Gummy Bear (AB) 6.5g *Record this Value in Table 5 Table 4B: Day 2 Mass Data Materials Grams (g) A. Weight of Paper Towel 3.0g B. Weight of Paper Towel 7.4g with Gummy Bear Weight of Gummy Bear (A- *Record this Value in Table 5 B) Table 5: Density Gummy Bear Data 1700 n/a orang e 2.3cm 0.8cm Front to Back Thicknes s (cm) 1.3cm n/a 1700 tan 2.8cm 0.9cm 1.2cm 3.024cm3 3.0g 0.99g/c m3 n/a n/a Much paler 0.5cm 0.1cm 0.1cm 1.23cm3 0.9g 0.18g/c m3 Start Time Day Day 1 Day 2 Difference (Day 1- Day 2) Stop Time Bear Color Head to Toe Length Arm to Arm Width (cm) (cm) Volume Mass Density (cm3) (g) (g/ cm3) 1.794cm3 2.1g 1.17g/c m3 Post-Lab Questions: 1. What was your hypothesis as to what would happen to the gummy bear? Was it correct? Click here to enter text. 2. How long did your gummy bear soak? What do you think would have happened if you left it in for twice as long? Click here to enter text. 3. Which change was greater, volume or mass? Explain your answer using scientific logic. Click here to enter text. 4. Which piece of information recorded in the data table do you think is least important? Explain why you think this is and why it had no effect on the results of the experiment. Click here to enter text. 5. How did the changes in mass and volume from Day 1 to Day 2 affect the density of your bear? Click here to enter text. 6. How could you get more accurate results from this lab? List and explain one way you could reduce your errors. Click here to enter text. Using the sheet of graph paper in your kit, create a bar graph using the data in Table 5 to compare the density obtained for each day studied. You can also use a graphing program to create this graph. Hint: In order to scale the graph, you take the range of the numbers (the highest number and the lowest number), subtract them and divide by the number of lines on your graph. This will tell you how to divide up your graph evenly so it’s not all squished onto one area of the graph. Hint: The dependent variable is placed on the Y axis when the independent variable is placed on the X axis. When you create your graph, remember that the X and Y axes need to be labeled and you should give a title to your graph. Insert a picture of your graph.

Tutor Answer

proggerardo
School: Purdue University

Attached you will find the answers for the third lab. I made some changes in your data. I noticed some mistakes in the calculations. Please let me know if you need clarification or edits.

Pre-Lab Questions:
1. In your own words, describe how to calculate density.
The density of a substance is calculated as a division between the mass of the substance (in the
numerator) and the volume of the substance (denominator). The units of density are related
with the units of mass and volume used, normally is expressed as kg/m3, g/cm3 or g/mL.
2. Explain why the metric system is used in science.
To avoid confusion between scientists they agreed to use a system of standard units, the
International System of Units (abbreviated SI). SI units are closely related with the metric units,
that are commonly used in many industrialized nations of the world except for the United
States. Making a comparison with some of the most common physical quantities, the basic
metric unit of mass is the gram (g) rather than the kilogram (kg), the metric unit of volume is
the liter (L) rather than the cubic meter (m3), and the metric unit of temperature is the Celsius
degree (°C) rather than the kelvin. The meter is the unit of length and the second is the unit of
time in both systems. Although SI units are now preferred in scientific research, metric units are
still used in some fields.
3. In any given experiment, how is it possible for your experimental technique to be both accurate
and precise?
Accuracy tells us how close a measurement is to the true value of the quantity that was
measured. Precision refers to how closely two or more measurements of the same quantity
agree with one another. ...

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Anonymous
awesome work thanks

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