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Summary CHEM131 Matter and Atomic Calculations $2.99   Add to cart

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Summary CHEM131 Matter and Atomic Calculations

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Brief introduction on the states of matter. How to recognize and utilize atomic number and mass to determine amount of protons, electrons, and neutrons in an element. How to calculate for isotopes of an element. How to calculate atomic mass of elements and percent abundance of isotopes.

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  • September 3, 2024
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Types of Matter

-
atoms = subatomic , building blocks
-
Molecules = It atoms, chem bonds

- solid matter = atoms packed close


-
atoms vibrate ,
dont move
-f fixed vol/shape

-
liquid matter = atoms packed close like solid but can move


-
fixed
rol , not shape

-

gas matter= lots of space ,
compressible

Mass
I


E X
I
atomic num




Mass = prot + neut


atomic num = prot (if neutral , elec = prot)
* memorize above




G 6 6

6 6 7

6 6 S
12
6 6 6

19 19 20
is stopes = same element that weigh
1 16 12

17 1s 18 diff cents creat changes


eg : 3C1 has "Cl and "Cl ,
but more o (1

calculating mass


20 . 7577)(34 97 g/m x)) .
+ (0 2423)
.




(36 .
47 g/m)) = 35 .
4Sy/m>




at Mic Mass = 2 (fraction isotope) (Mass isotope) Memorize

Br atomic mass = 79 904 g/m)
.




79 .
904 = (8 . 42g(me))x + (8) .
92g/ms)) y

* we know x+y = 1 So y = 1 -X


7 n 434 .
= 78 . 92x + 80 . 92 - 83 92x .




1 016 = 2x + X = 0 58 0 492
. .
y= .




# sig figs r wrong , re-learn sig figs

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