Preview

Chemistry 205 Chapter 2 Concept Explorations

Good Essays
Open Document
Open Document
1110 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Chemistry 205 Chapter 2 Concept Explorations
Assignment Chapter 2
Concept Explorations
2.25. Average Atomic Mass
Part 1:
Consider the four identical spheres below, each with a mass of 4.00 g. a. Calculate the average mass of a sphere in this sample.
(4.00 + 4.00 + 4.00 + 4.00)/4= 16.00/4= 4.00g Part 2:
Now consider a sample that consists of four spheres, each with a different mass: blue mass is 4.00 g, red mass is 3.75 g, green mass is 3.00 g, and yellow mass is 1.25 g. * a. Calculate the average mass of a sphere in this sample.
(4.00 + 3.75 + 3.00 + 1.25)/4= 3.00g * b. How does the average mass for a sphere in this sample compare with the average mass of the sample that consisted just of the blue spheres? How can such different samples have their averages turn out the way they did? The sizes of these spheres are different. This can be caused by many factors such as the temperature could have changed the composition or size of the spheres in part two or the spheres could be different sizes. These factors are unknown, but what is known is that the masses are different, so the average mass changed for varying masses as compared to a constant mass.
Part 3:
Consider two jars. One jar contains 100 blue spheres, and the other jar contains 25 each of red, blue, green, and yellow colors mixed together. * a. If you were to remove 30 blue spheres from the jar containing just the blue spheres, what would be total mass of spheres left in the jar? (Note that the masses of the spheres are given in Part 2.)
70 X 4.00= 280.00g * b. If you were to remove 30 spheres from the jar containing the mixture (assume you get a representative distribution of colors), what would be the total mass of spheres left in the jar?

70 X 3.00= 210.00g * c. In the case of the mixture of spheres, does the average mass of the spheres necessarily represent the mass of an individual sphere in the sample?
No, because the average is not the exact mass for each sphere. It is an estimated number that represents

You May Also Find These Documents Helpful

  • Satisfactory Essays

    2. The stirring furthered the reaction so it changed more towards blue as it was mixed.…

    • 501 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    CHM130 Lab 6

    • 1556 Words
    • 6 Pages

    4. In Part II, what happened to the cans of soda when you placed them in water? Use the concepts/vocabulary of volume and mass to explain the…

    • 1556 Words
    • 6 Pages
    Good Essays
  • Satisfactory Essays

    FLVS homeschool

    • 424 Words
    • 2 Pages

    4. Calculate the density (g/mL) of the irregular-shaped solid (D) for each trial. (Divide the mass of the solid [4] by the volume of the solid calculated above (C))…

    • 424 Words
    • 2 Pages
    Satisfactory Essays
  • Powerful Essays

    Nt1310 Unit 6 Lab Conclusion

    • 2742 Words
    • 11 Pages

    The mass of a cylinder was determined using a digital balance. These results are more questionable since the device may not have been properly calibrated. A more refined approach would be to use a newly calibrated balance of even greater…

    • 2742 Words
    • 11 Pages
    Powerful Essays
  • Good Essays

    Chem Lab

    • 721 Words
    • 3 Pages

    The purpose of this experiment is to use two common laboratory methods to see how mixtures can be separated based on physical properties. Paper chromatography will be used to separate the dye colors from M&M candy to see which colors contain yellow #5. Gravimetric separation will be used to separate salt and sand from a mixture.…

    • 721 Words
    • 3 Pages
    Good Essays
  • Good Essays

    6. Divide the mass of each sample by its respective amount of beans to find the average mass of one bean. Write these numbers in the data table.…

    • 792 Words
    • 4 Pages
    Good Essays
  • Good Essays

    The persona COmputer

    • 624 Words
    • 3 Pages

    44. A student has several different-size samples of substances I and II. She measures the masses and volumes of these samples and plots the graphs shown in Figure D page 67. Which substance has greater density? How do you know?…

    • 624 Words
    • 3 Pages
    Good Essays
  • Powerful Essays

    Osmosis Lab Report

    • 1235 Words
    • 5 Pages

    Beginning with the beaker of 0.0 g pull one potato core out of the solution and utilization of the electronic balance, determine the mass of each.…

    • 1235 Words
    • 5 Pages
    Powerful Essays
  • Good Essays

    One error in our data was that the measurements we gathered for one of our sets were rather high. Even after re-doing the entire procedure for the set, our measurements were still off. Looking back, we didn’t dry off the graduated cylinder each time before re-filling it with water, which could have thrown off our volumes and therefore our densities. Since we combined all of our data as a class, we were able compensate for these errors. One method that could be improved to ensure more accurate and precise data is to have everyone use the same balance to get the masses of the pennies.…

    • 417 Words
    • 2 Pages
    Good Essays
  • Good Essays

    Chemistry Experiment 2

    • 280 Words
    • 2 Pages

    Conclusion: Weighing all the substances as one should weight the same as weighing them each separate and adding them together.…

    • 280 Words
    • 2 Pages
    Good Essays
  • Good Essays

    Density Lab

    • 832 Words
    • 4 Pages

    2. Suppose you determined the density of a cube to be 1.40 g/cm3. Would the density of the cube be different if you had a cube made of the same material with twice as much mass? Explain.…

    • 832 Words
    • 4 Pages
    Good Essays
  • Good Essays

    The Scientific Method

    • 372 Words
    • 2 Pages

    This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor.…

    • 372 Words
    • 2 Pages
    Good Essays
  • Good Essays

    Naked Egg Lab Report

    • 1402 Words
    • 6 Pages

    The hypothesis that was posed was that, “If naked eggs are soaked in two different colors of food coloring for different periods of time, then the mass of the egg will differ, and the red food coloring will make the egg overall bigger than the blue.” However, the data proved that the color of the dye does not affect the osmotic properties of a naked egg in food dye. Both the red and blue food dye at the end of the experiment ended around 100 grams (blue at 99.86, and red at 100.84). By just this, you would tell you that red food coloring caused more of a gain in mass. However, you can tell on the graph above that the increase and decrease of egg mass between days did not differ enough to make that assumption. Because the original red egg was larger at the beginning, this probably explains why it ended up bigger than the blue at the end of the…

    • 1402 Words
    • 6 Pages
    Good Essays
  • Good Essays

    Chem Pre-Lab

    • 635 Words
    • 3 Pages

    We know that that the end point of the titration is reached when, after drop after careful drop of NaOH, the solution in the flask retains its pale pink color while swirling for about 30 seconds (as opposed to the pink color simply disappearing as the base mixes into the solution).…

    • 635 Words
    • 3 Pages
    Good Essays
  • Good Essays

    M&M Lab

    • 533 Words
    • 3 Pages

    C. You now have two values for the thickness of an M&M in Table 1. Determine the average M&M thickness using these values and record your value in Table 3.…

    • 533 Words
    • 3 Pages
    Good Essays