Periodic Table
Electron Dot Diagrams
Lattice Energy
Bond Enthalpy
Shapes, Bonds, and Polarity
100
What is the difference between polar and nonpolar bonds?
polar - unequal sharing of electrons
nonpolar - equal sharing of electrons
100
Draw the lewis dot diagram for Sodium (Na)?
Na and one electron.
100
Define lattice energy.
the energy required to completely separate one mole of a solid ionic compound into gaseous ions
100
Define bond enthalpy.
Energy required to break one mole of a specific type of bond in the gaseous state, so our units are again kJ/mol
100
How many bonds does Oxygen (O) form?
2
200
Draw the trend of electronegativity.
Electronegativity increases up and to the right!
200
Draw the lewis dot structure for Strontium (Sr)?
Sr with 2 electrons
200
What is the correct unit label for lattice energy?
kJ/mol
200
True or false: The breaking of bonds is an exothermic process.
False.
200
Which type of bond is the strongest?
Triple bonds
300
Is this molecule polar? If it is, draw dipole moments!
CH3Cl
Yes!
300
Draw the lewis dot diagram for Silicon (Si)?
Si with 4 electrons
300
True or false: Lattice energy values are always negative because these reactions give off heat.
False!
300
Determine the enthalpy of reaction for the following:
H2(g) + 1⁄2 O2(g) ---> H2O(g)
Using the following bond enthalpies (in kJ/mol): H−H (432 kJ/mol); O=O (496 kJ/mol); H−O (463 kJ/mol)
ΔH = −246 kJ
300
Which type of bond is the longest?
Single
400
Is this molecule polar? If it is, draw a dipole moment!
CO2
No!
400
Draw the lewis dot diagram for NaCl?
400
Lattice energies are highest for...
a) large, highly charged ions
b) large, less charged ions
c) small, highly charged ions
d) small, less charged ions
c) small, highly charged ions
400
You are told three different carbon-carbon bonds have the following bond enthalpies:
614 kJ/mol
348 kJ/mol
839 kJ/mol
Identify which bond type (single, double, or triple) belongs to which bond enthalpy.
single = 348 kJ/mol
double = 614 kJ/mol
triple = 839 kJ/mol
400
Which is more polar? HF or H2O?
HF
500
Classify the following molecules as polar, nonpolar, or ionic.
MnO
HCl
S8
H2S
Ionic
Polar
Nonpolar
Polar
500
Draw the lewis dot diagram for NH3.
500
Arrange GaP, BaS, CaO, and RbCl in order of increasing lattice energy.
RbCl < BaS < CaO < GaP
500
Calculate the bond dissociation energy for one mole of O−F bonds, given the following data.
F−F bond dissociation energy = 159 kJ/mol
O=O bond dissociation energy = 498 kJ/mol
F2(g) + 1⁄2 O2(g) ---> OF2(g) ΔH = 28 kJ
x = 190 kJ
500
Define electronegativity and rank the following elements in order of increasing electronegativities.
Al, H, Na, O, P
ability of an atom in a molecule to attract electrons to itself
Na, Al, H, P, O