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Cards In This Set
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Classify the following compounds as ionic or covalent.
1.CaCl2 2.CO2 3.H2O 4.BaSO4 |
I,C,C,I
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Why are many elements more stable as ions than they are as atoms?
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Because as ions they have noble gas configuration which makes them more stable and have a full octect along with a full outer valence electron shell
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Explain the unusual electron configurations of the d-block elements chromium & copper.
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Its easier to obtain a full d blockorbital than a half s orbital
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Covalent or ionic?
compound is a gas at room temp compound conducts electricity in solution elemnts in the comound share electrons compound has a very high melting point iron bonded ot chlorine carbon bonded to sulfur tin bonded to sulfate compound is a liquid at room temp compound is brittle |
C, I, C, I,I,C,I,C,I
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Explain how the nature of metallic bonding explains the following characteristics of metals:
a. thermal and electrical conductivity b.ductility and malleability c.luster |
A)thermal- when heated the electrons at the end increase in keinetic energy and rapidly flow through metal transporting heat energy with them
electrical-if the delocalized electrons are free to move around that allows a current of electrical to flow easily because of delocalized electricity, travels through easily too b) ductility and malleability-delocalized electrons, metallic bonding is not directional but uniform throughout the sold, because of delocalized electrons each other without friction c)luster- the delocalized electrons in metals do really absorb or capture light when light strikes a metal surface all visible light |
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Explain how covalent, ionic and metallic bonds differ in terms of what happens with the electrons in forming these bonds.
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Covalent-shared electrons
ionic- give away electrons/gained metallic-move around/create electron sea |
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Why are some covalent bonds polar and others non-polar?
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Non-polar: equal sharing of electron pair
polar: unequal sharing of electron pair |
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A. which 7 elements which are always diatomic in nature?
b.name 3 elements whose natural states can be even larger than diatomic |
A. N, O,F,Cl,Br,I,H
b. N2,O2 |
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WHat is the difference between a molecule and a formual unit?
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Molecule- covalent compound
formula unit-ionic compound |
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The bond angles in NH3 are 107* and in NH4+ are 109.5*. Explain the difference
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107- trigonal pyramidal: 1 unshared pair
109.5- tetrahedral: zero unshared pairs |
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Given the molecules NF3 and BF3, what are their molecular geometries and why are they different?
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-trigonal pyramidal, 4 peripheral atoms, shared pairs
-trigonal planar, 3 peripheral atoms |
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Why does water have a unusually high boiling point?
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Because it is a hydrogen containing compound and teh molecules hold on tightly to each other an dodnt want to let go
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Which intermolecular force is the weakes? If it is so weak, why is it significant?
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London dispersion forces are the weakes. it acts between alll molecules but they are the only intermolecular forces acting on noble gase and non-polar molecular compounds
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Why wont gasoline dissolve in water?
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becasue it is non-polar and water is polar
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Compared with shared pairs of valence electrons, unshared pairs exert
a.greater repulsion b.lessrepulsion c.the same repulsion force d.no repulsion |
a
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