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17 Cards in this Set
- Front
- Back
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molecular structure of a substance is often essential in
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explaining its physical and chemical properties
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molecular models are a very useful way of representing
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molecular structure
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what are Ions
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atoms (monoatomic) or groups of atoms (polyatomic) with a "+" or "-" charge.
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Cation
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an ion with a "+" charge (atom loses e's)
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Anion
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an ion with a "-" charge (atom gains e's)
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with momatomic ions on the periodic table some ions will always have the same
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ion charge
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groups 1A, 2A, and 3A on the periodic table have what charges
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group 1A has +1, group 2A has +2, group 3A has +3. This is the main group (metals)
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Main group (nonmetals only) have a charge of
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the group number -8
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polyatomic ions are
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groups of atoms that bear a net charge.
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Ionic compounds are
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the component particles are ions. cations + anions = ionic compounds
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the formula of ionic compounds
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cation first, then anion
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all compounds are _________, in a formula unit they should have _________
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neutral, balanced charges
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the oppositely charged ions in ___________ are attracted to each other by _____________
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ionic, electrostatic forces
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electrostatic forces are governed by
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coulomb's law
force of attraction = K (N^+(e))(N^-(e))/(d^2) |
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In Coulomb's equation what does N+,N-, e, and d stand for
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N+ and N- are the + and - ion. e is the charge on the electron which is 1.602 X 10^-19 C
d is the distance between the centers of the ions |
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In coulombs law the higher the charge
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the smaller the ion, and the stronger the attraction
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properties of ionic compounds
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strong attraction among ions, hard, brittle, generally soluble in polar solvents, high melting point, high boiling point, form ions in solution
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