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CHEM 103 Exam 4 | General Chemistry Practice Questions & Study Guide

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Prepare for CHEM 103 Exam 4 with this focused exam-review resource. Designed to support studying, self-assessment

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Chem 103 exam 4 ../ ../ ../




ionic compound - correct answer -
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A compound that consists of positive and negative ions
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-
Formed when one or more electrons are transferred from one at
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om to another
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simple ionic compound - ../ ../ ../


correct answer Contains a metal and a non-metal (NaCl)
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metals vs nonmetals - correct answer -
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metal has low electronegativity and non-
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metal has high electronegativity
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-ionic compounds are neutral
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-metals form cations and non metals form anions.
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why do ionic compounds form? - correct answer -
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requires energy to form ions (either adding or removing electro
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ns)
-ion-ion interactions release energy and stabilize system
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,-Ionic compounds form when the energy released by ion-
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ion attractions (lattice energy) is greater than the energy require
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d to form the ions.
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This results in a net release of energy → the compound is ther
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modynamically stable ../




cations - correct answer -positively charged ions
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-simple cations form when metals lose electrons
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-charge usually corresponds to loss of electrons back to "core"
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-Ions are less stable than neutral atoms -
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loss of electrons always requires energy
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why do ions form if they are less stable than a neutral atom? -
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correct answer Because the overall process is favorable once t
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he cation meets an anion.
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-
Even though it costs energy to form the cation, the lattice energ
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y released is even greater
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, lattice energy - ../ ../


correct answer energy released when an ionic lattice forms fro
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m ions in the gas phase
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-
amount of energy depends on how strong the interaction is bet
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ween ions ../



-stronger the attraction, the greater the lattice energy
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anions - correct answer -negatively charged
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-simple anions formed when non-metals gain electrons
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charge usually corresponds to gain of electrons to the next fille
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d (sub) shell
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-ions are less stable than neutral atom-
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gaining electrons always requires energy
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Sodium Chloride (NaCl) - correct answer -each Cl-
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is surrounded by 6 Na+ ions
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-Each Na+ is surrounded by 6 Cl- ions
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what determines lattice energy - correct answer -
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ionic charge (higher charge = stronger attractions)
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