Summary

Summary CHEM131 Matter and Atomic Calculations

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Course
CHEM131

Institution
University Of Maryland - College Park

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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Uploaded on September 3, 2024
Number of pages 1
Written in 2024/2025
Type Summary

matter
states of matter
solid
liquid
gas
atoms
molecules
atomic number
protons
neutrons
electrons
mass
atomic mass
isotope abundance

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8128/24

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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