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Title: Atomic Mass and Theories
Description: average atomic mass, atomic theories, significant digits, isotopes, and mass spectrometer
Description: average atomic mass, atomic theories, significant digits, isotopes, and mass spectrometer
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Sig digs:
Ex
...
0130 when the decimal is present, ignore the left side
...
129 all sig digs
120 has 2
120
...
0 has 4
When adding/subtracting, only take the number with the least decimal places
...
1923
...
1 = 1929
...
Ex
...
02 x 26
...
Al-27 ion
P= 13
E = 10
N = 14
27-13 = 14 (atomic mass – atomic # = neutrons)
Accuracy and precision
Accuracy: how close the values are to the answer
Precision: how close the values are to each other
Percent error: =
𝐴𝑐𝑡𝑢𝑎𝑙 𝑣𝑎𝑙𝑢𝑒−𝑚𝑒𝑎𝑠𝑢𝑟𝑒𝑑 𝑣𝑎𝑙𝑢𝑒
𝐴𝑐𝑡𝑢𝑎𝑙 𝑣𝑎𝑙𝑢𝑒
x 100
Ex
...
25m teacher said its actually 2
...
what is the
percent error?
2
...
25
Percent error = 2
...
2
...
4
...
Same number of protons, different
numbers of neutrons because atomic mass is different
...
Co-60 = 60 is mass
Average atomic mass (AAM)
(𝑚𝑎𝑠𝑠 𝑜𝑓 𝑖𝑠𝑜𝑡𝑜𝑝𝑒 1 𝑥 𝑟𝑒𝑙𝑎𝑡𝑖𝑣𝑒 𝑎𝑏𝑢𝑛𝑑𝑎𝑛𝑐𝑒 𝑜𝑓 𝑖𝑠𝑜𝑡𝑜𝑝𝑒 1)
+ (𝑚𝑎𝑠𝑠 𝑜𝑓 𝑖𝑠𝑜𝑡𝑜𝑝𝑒 2 𝑥 𝑟𝑒𝑙𝑎𝑡𝑖𝑣𝑒 𝑎𝑏𝑢𝑛𝑑𝑎𝑛𝑐𝑒 𝑜𝑓 𝑖𝑠𝑜𝑡𝑜𝑝𝑒 2)
Ex
...
4 amu, what are the
% abundances?
(35)(x) + (37)(1-x) = 35
...
4
-2x + 37 = 35
...
4 = 2x
1
...
8 = x
20% is the abundance
Mass Spectrometer used to find the different isotopes in an element
1
...
Ionize (remove negative charges)
3
...
Deflect (particles pass thru magnetic field more mass = less deflection)
5
Title: Atomic Mass and Theories
Description: average atomic mass, atomic theories, significant digits, isotopes, and mass spectrometer
Description: average atomic mass, atomic theories, significant digits, isotopes, and mass spectrometer