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The Learning Goal for this assignment is:<br />
Explore the scientific theory of atoms ( also know as atomic theory) by describing changes in the atomic<br />
model over time and why those changes were necessitated by expiramental evidence.<br />
Notes Section<br />
Calculating atomic mass<br />
In order to calculate the atomic mass you must understand the occurences of number due to the percentage. The<br />
first step to understandin how to calculate atomic mas is turning your relative abudance/Amu into a decimal<br />
by makin it zero point and its original numbers. Then after you converted your amu into a decimal you times it by<br />
the mass. Then you repeat the same process with the other set of mass and amu. After you add both of the results<br />
up and then you get your awnser then you put in correct format by looking at the exact number of significant figures<br />
the first set of number had and you put the same amount of signifcant number in your final awnser.<br />
Ex<br />
The element is naturaly occurring isotopes with the masses numbers of 63 and 65. The realtive abudance and the<br />
atomis mass is 69.2 % for mass= 62.93 amu and 30.8% for mass= 64.93 amu. Calculate the atomic mass of<br />
Copper?<br />
First of you must get your first pair first which is :<br />
69.2% = 62.93 amu Repeat process with the other numbers.<br />
30.8=64.93<br />
Next you turn the amu into decimal.<br />
Turn amu into decimal<br />
0.6293 0.6493<br />
Then you multiply the decimal by the mass.<br />
Multiply decimal with mass<br />
69.2 x 0.6293 30.8 x 0.6493<br />
You recieve awnser<br />
you recieve youre awnser<br />
43.54756 19.99844<br />
Then you add both of your awnser together to get final awnser<br />
43.54756 + 19.99844 = 63.546<br />
you put in correct format by looking at the exact number of significant figures<br />
that the mass had and you put the same amount of signifcant number in your final awnser<br />
<strong>Final</strong> awnser : 63.5<br />
http://www.learner.org/interactives/periodic/basics_interactive.html<br />
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