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Final Chemistry Notebook

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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 />

30

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