Which of the following molecules has bond polarity but
no molecular polarity?
A: N2
B: SCl2
C: NH3
D: CO2
The VSEPR theory is used to predict molecular shapres, based on
the arrangement of-
A: lone pairs of
electrons on the outer atoms
B: lone pairs of
electrons on the central atom
C: bonding pairs of
electrons on the central atom
D: bonding and lone
pairs on the central atom
Which of these molecules has a central atom surrounded by...
Which of the following statements is true?
a. If bond enthalpies of bonds broken in a reaction are greater
than bond enthalpies of bonds formed, the reaction is
exothermic.
b. If the number of bonds broken in a reaction is greater than
the number of bonds formed, the reaction is endothermic.
c. If the sum of all bond enthalpies of bonds broken in a
reaction is greater than the sum of all bond enthalpies of bonds
formed, the reaction is...
1. Bond polarity and molecular shape determine molecular
polarity, which is measured as a dipole moment. True or
False?
2. Molecular shape and polarity can affect physical properties,
such as boiling point, and they play a central role in biological
function. True or False?
3. A molecule with polar bonds is not necessarily a polar
molecule. When bond polarities cancel each other, the molecule is
nonpolar; when they reinforce each other, the molecule is polar.
True or False?
1. Which of the following statements are true about covalent
bonds, according to the Valence Bond Theory? (select all that
apply.)
End-to-end orbital overlaps are more stable than edge-to-edge
orbital overlaps.
A triple bond contains one sigma bond and two pi bonds.
A triple bond is longer than a double bond.
Valence p orbitals that are not used in hybridization can be
used to form pi bonds.
A double bond contains two pi bonds.
A sigma bond is stronger than...
The double bonds are stronger and shorter than single bonds. For example, a C−C single bond has an average bond energy of 347 kJ/mole while a C=C double bond has an average bond energy of 611 kJ/mole. Use valence bond theory to explain why a double bond is not simply twice as strong as a single bond.
if A,B, and C are true statements and X,Y, and Z are false
statements, determine which of the following are true :
1. ~[(B > Z) * ~ (A * Y)]
2. [A * (Z > C)] V ~ [(C > B) V ~(X * ~B)]
3. {[(A * B) > ~ (~C V ~Z)] * ( ~Y V Z)} * [(X > ~B)
>A]
4. ~{[A > ~(Z > C)} > [(A * ~B) V (Y > ~Z]} *...