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Lecture 1

CHEM 06100 Lecture Notes - Lecture 1: Ionic Compound, Sodium Chloride, Ion


Department
Chemical Engineering Biochemistry
Course Code
CHEM 06100
Professor
Grinias
Lecture
1

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Chapter 1
Chemistry 1
Isotopes are atoms of the same element. That means they have the same number of protons
(2) but different number of neutrons.
Atomic Weight
Because isotopes of an element contain different numbers of neutrons, they have different
masses.
The atomic weight of an element is the average mass of all its atoms.
Boro’s atoi weight is approiatel 0.20x(10u) + 0.80x(11u) =10.8 U
Ionic Compounds
1) Compound of ions, which always have a charge
2) Ions are formed by transfer of one or more electrons from one atom to another
3) Caption (positive ion) is written first in formulas (Example: NaCl, FeO3, LiF ,Cs2S)
4) Electron transfer occurs when atoms have greatly different attractions for electrons
(opposite side of periodic table)
5) Electronegativity difference is greater than 1.7
Polyatomic Ions
I ters of how ou’re puttig thigs together ut they work together.
Examples:
NH4+ Ammonium
OH- Hydroxide
CO32- Carbonate
SO42- Sulfate
In a binary ionic compound, both the cation and the anion are monatomic.The name of the
cation is the same as the name of the metal. Many metal names end in -ium.The anion is
named by adding the suffix -ide to the root of the nonmetal name.
Example: Calcium (2+) and bromine (1-) from Calcium Bromine. CaBr2
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