chem 120 exam 3
Study online at
https://quizlet.com/_d3gmud
1. Lewis dot structure shows how the valence electrons are
arranged among the atoms in the
molecule
2. what compounds have fewer H-2
than 8 valence electrons?
B-6
Be - 6
3. what compounds have more
period 3 or lower
than eight valence
electrons?
4. what is the VSEPR theory? it predicts the shapes of molecules based on
the idea
that electrons repel each other.
5. linear 2 regions, AX2, 180 degrees
6. trigonal planar 3 regions, AX3, AX2E, 120 or slightly <120
degrees
7. tetrahedral 4 regions, AX4, AX3E, AX2E2, 109.5 or slightly
<109.5 degrees
8. nonpolar covalent bond equal sharing of electrons
9. polar covalent bond unequal sharing of electrons
10. intramolecular forces bonds within a compound
11. intermolecular forces hold neighboring molecules/atoms together
12. dispersion forces weakest, only force in non polar substances,
exists in all substances, strength increases with
increasing MW, boiling point is a measure
of the IMF
1/
8
, chem 120 exam 3
Study online at
https://quizlet.com/_d3gmud
13. dipole-dipole forces stronger than dispersion, higher boiling
points, only present in polar substances, as
MW increases, strength increases, therefore
boiling point increases
2/
8
Study online at
https://quizlet.com/_d3gmud
1. Lewis dot structure shows how the valence electrons are
arranged among the atoms in the
molecule
2. what compounds have fewer H-2
than 8 valence electrons?
B-6
Be - 6
3. what compounds have more
period 3 or lower
than eight valence
electrons?
4. what is the VSEPR theory? it predicts the shapes of molecules based on
the idea
that electrons repel each other.
5. linear 2 regions, AX2, 180 degrees
6. trigonal planar 3 regions, AX3, AX2E, 120 or slightly <120
degrees
7. tetrahedral 4 regions, AX4, AX3E, AX2E2, 109.5 or slightly
<109.5 degrees
8. nonpolar covalent bond equal sharing of electrons
9. polar covalent bond unequal sharing of electrons
10. intramolecular forces bonds within a compound
11. intermolecular forces hold neighboring molecules/atoms together
12. dispersion forces weakest, only force in non polar substances,
exists in all substances, strength increases with
increasing MW, boiling point is a measure
of the IMF
1/
8
, chem 120 exam 3
Study online at
https://quizlet.com/_d3gmud
13. dipole-dipole forces stronger than dispersion, higher boiling
points, only present in polar substances, as
MW increases, strength increases, therefore
boiling point increases
2/
8
