Chemistry
Name________________
Block_________________
The Atomic Mass of Beanium
Lab Report Format:
Heading:
Chemistry
Name________________
Teacher’s Name
Block_________________
The Atomic Mass of Beanium
Purpose: To analyze the isotopes of beanium and to calculate its atomic mass.
Materials:  sample of beanium
 balance
Procedure:
Obtain a sample of beanium. Separate the three isotopes (red beans, black eyed peas and
popcorn) and measure the mass of each isotope. Count the numbers of each type of bean.
Make a table similar to the table below, to record your measured and calculated data.
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Black Eyed
Red Beans
Popcorn
Totals
Peas
Total Mass
(grams)
Number
Average
Isotopic Mass
(grams)
Relative
Abundance
Percent
Abundance
The average atomic mass of Beanium is _________________________________.
Calculations:
Using the experimental data, record the answers to the following questions below in your data
table.
1. Calculate the average mass of each isotope by dividing its total mass by the number of
particles of that isotope.
2. Calculate the relative abundance of each isotope by dividing its number of particles by
the total number of particles. Since these are both counting numbers with no estimation
in the reading, give the answers to four significant figures
3. Calculate the percent abundance of each isotope by multiplying the relative abundance
from Step 2 by 100.
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4. Calculate the average atomic mass of all beanium particles. {Remember Average
Atomic Mass = (mass isotope #1)(relative abundance isotope #1) + (mass isotope
#2)(relative abundance isotope #2)+ ········}. This average mass is the atomic mass of
beanium.
Questions:
1. What is the result when you total the individual percent abundances? The individual
relative abundances?
2. Explain any differences between the atomic mass of your beanium sample and that of
other lab groups. Be sure to present the data from the other groups in your lab report.
Explain why the difference would be smaller if larger samples were used.
Grading Criteria:

Word Processed with Correct Format
(10 points)

Correct Spelling Used with Complete Sentences
(10 points)

Purpose Correctly Stated
(10 points)

Materials Correctly Stated
(10 points)

Procedure Correctly Stated
(10 points)

Observations/Data Tables
(10 points)

Correct Mass of Beanium
(10 points)

Sample Calculations (can be hand written)
(20 points)

Analysis & Conclusions
(10 points)
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