Lewis Dot Structures
Polarity
Periodic Trends
Formula/Naming Compounds
Shape/Polarity of Molecules
100
H2
H-H
100
Which has the largest dipole? HF, CH4, or NaBr?
HF
100
Which is most electronegative? Barium, Bromine, Fluoride, or Sodium?
Fluoride.
100
Name NaBr
Sodium Bromide
100
Electron geometry and shape of CCl4
Tetrahedral, Tetrahedral
200
HBr
H-Br:::
200
Is water polar or nonpolar?
Polar
200
Which of the following elements can have multiple oxidation states? (Can be more than one answer) Cl, Carbon, Cu, Bromine, Sodium, Mg
Cu
200
Formula for Silicon Dioxide
SiO2
200
BF3 Shape and Geometry
Trigonal Planar and Trigonal Planar
300
H2CCH2
H2C=CH2
300
If you have an unknown metal paired with a nonmetal to form a compound, what would you expect the polarity and electronegativity to be?
Ionic = metal + nonmetal. Thus, it would be a polar bond since EN >1.8
300
Explain why atomic radius increases as you go from right to left and from top to down.
Going down, the n principal number increases which means that there is a greater distance from the electrons and the nuclei. Going left, the proton number decreases which means the attractive force is less so that equals a larger radius.
300
Write the formula for Cobalt (II) Hydroxide
Co(OH)2
300
NF3 - Whats the geometry and shape?
Tetrahedral, trigonal pyramidal.
400
NO- Also, is this a polar molecule?
[::N=O::]-
400
C2H5OH is the formula for ethanol. Which bond has the strongest dipole movement and which bond has the weakest? Is the overall molecule polar?
OH is the strongest dipole, pointing towards oxygen. C-C is the weakest dipole since same electronegativities.
400
If I have a made-up element that has 6 valence electrons (group 16), would you expect the first ionization energy to be smaller or greater than the second ionization energy?
2nd Ionization energy greater, removing 1 electron costs a certain amount of energy, but removing 2 would require even more energy since you are getting closer to the nucleus. Outer electrons are easier to remove.
400
The formula for Lithium Sulfite
Li2SO3
400
NO2- draw the structure and show shape and geometry
:::O-N:=O:: Geometry is Trigonal Planar with a shape of bent
500
ClNO Also, what is the electron geometry and the molecular structure for this molecule? What are the bond angles?
:::Cl-N:=O:: , It is Tetrahedral geometry with Trigonal Pyramidal shape. 109°
500
Consider dicarbon tetrachloride. What is the structure and polarity of this molecule? Are the bonds polar?
It is Cl2-C=C-Cl2, polar bonds but dipoles cancel so it is a nonpolar molecule.
500
Which of the following statements are true about atomic radius:
1. Atomic radius increases with increasing energy level. Atomic radius increases as new electrons are added within the same orbital.
2. Atomic radius decreases with increasing energy level. Atomic radius increases as new electrons are added within the same orbital.
3. Atomic radius increases with increasing energy level. Atomic radius decreases as new electrons are added within the same orbital.
#3 is right. Increasing the energy levels means that electrons are further from the nucleus = larger atomic radius. Atomic radius decreases as new electrons are added within the SAME orbital since protons are also added.
500
Formula for Iron (II) bicarbonate and name Ca(C2H3O2)2?
Fe(HCO3)2 and Calcium Acetate
500
Consider the O-C-O bond. What bond angle is this closest to? Is this molecule polar or nonpolar?
12O° and Polar