Bonding and Structure
What is the Electronegativity difference of Nonpolar, Polar, and Ionic atoms?
Nonpolar : <0.5 Polar : 0.5-1.7 Ionic : >1.7
What molecular shape does CO2 make?
Linear
Draw Lewis diagram for NCl3
Look at slideshow for model (slide 2)
Identify which is pure, substitutional, and interstitial
Look at slideshow (slide 6)
How many electron domains correspond to sp, sp2,and sp3? Which is more stable a structure with 0, -1 or +1 formal charge?
sp - 2
sp2 - 3
sp3 - 4
0 formal charge
Which atom, N or O has a greater electronegativity? Justify
O because it has more protons, smaller radius resulting in more shielding
What would be the bond angle for the following molecules?
Tetrahedral, Octahedral, and Trigonal Planar
Tetrahedral - 109.5
Octahedral - 90
Trigonal Planar - 120
Draw Lewis diagram for C3H8O
Look at slideshow for model (slide 3)
What is an alloy?
Mixture of two or more elements. One being a metal
Compare formal charges of C and O in CO2
C = 4-6=-2
O = 6-7=-1
Why does CaF2 have a higher lattice energy than NaCl?
Due to higher charges on its ions and a smaller intermolecular distance between ions.
A molecular with 5 electron domains and no lone pairs has what geometry?
Trigonal bipyramidal
Why is 02 represented with a double bond and not a single bond?
Why are metals good conductors of electricity?
Delocalized electrons can move freely
Draw C2H4O2 and identify the formal charges on O atoms
O with double bond = 0
O with single bond = 0
A bond between two atoms has an electronegativity differerence of 0.8. What is the polarity?
Polar Covalent
What is the molecular geometry and bond angle on BrF5?
Square pyramidal and 90 degrees
Draw NH4+ and identify how many electrons it has
Look at slideshow for model (slide 4)
8 valence electrons
Which compounds would be stronger, NaCl or MgO?
MgO because ions are smaller and held closer together
Draw the resonance structures for NO3-
Look at slideshow (slide 7)
Two compounds have the same charge but compound A has a higher lattice energy. Why is this?
Compound A has a smaller Ionic radii leading to shorter distance between ions.
Explain why the actual bond angle for H20 is smaller than the tetrahedral angle?
The two lone pairs on oxygen create stronger repulsion, making the bond angle a little smaller than 109.5. Approximately 104.5
Draw CH2Cl2 and identify molecular geometry and bond angle
Look at slideshow for model (slide 5)
Tetrahedral and approximately 109.5
Ionic solids do not conduct electricity, but do when dissolved in water. Why is this?
Ionic solids do not have free movement of ions, when dissolved ion are free moving.
Draw H2SO4 and identify formal charge and hybridization on central atom
Look at slideshow (slide 8)