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Module 9: Polyatomic Ions and Molecular Geometry
vocabulary
13
Chemistry
12th Grade
10/06/2011

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Term
polyatomic ions
Definition
Ions formed when a group of atoms gains or loses electrons (285)
Term
tetrahedron
Definition
A molecular shape in which a central atom is surrounded by 4 bonds, each of which is 109 degrees apart from the others (291)
Term
VSEPR
Definition
Valence Shell Electron Pair Repulsion (291)
Term
VSEPR Theory
Definition
Molecules will attain whatever shape keeps the valence electrons of the central atom as far apart from one another as possible. (291)
Term
pyramidal
Definition
Molecular shape in which a central atom is surrounded by 3 bonds which form a pyramid. The bonds are 107 degrees apart. (292)
Term
bent
Definition
Molecular shape in which a central atom is bonded to two other atoms and the bonds are 105 degrees apart. (293)
Term
trigonal
Definition
Molecular shape in which a central atom is surrounded y 3 bonds, each of which is 120 degrees apart from the others (292).
Term
linear
Definition
Molecular shape in which a central atom with 2 bonds forms a straight line. Bond angle is 180 degrees. (295)
Term
purely covalent bond
Definition
A covalent bond in which the electrons are shared equally between the atoms involved (298)
Term
polar bond
Definition
Covalent bond in which the electrons are shared unequally between the atoms involved (299)
Term
polar covalent molecule
Definition
Covalent molecule that has fractional charges on some or all of its atoms. (303)
Term
Polar covalent compounds can dissolve:
Definition
Other polar covalent compounds
Ionic compounds

(This is because both types of compounds contain electrical charges.)
(307)
Term
Purely covalent compounds can only dissolve:
Definition
other purely covalent compounds.

(This is because no electrical charges are present.)
(307)
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