CHEM 1205 UPDATED COMPREHENSIVE EXAMS
QUESTIONS AND ANSWERS SURE A+
✔✔What does trigonal pyramidal look like? - ✔✔An atom surrounded by three groups
and the central atoms contains a lone pair with a bond angle of 107
✔✔What does bent look like? - ✔✔Central atom has two lone pairs and two bonds with
a bond angle of 105
✔✔What is electronegativity? - ✔✔Measure of an atom's attraction for electrons
✔✔What trend does electronegativity follow on the periodic table? - ✔✔Increasing
electronegativity to the right
Increasing electronegativity as it goes up
✔✔How does electronegativity effect polarity? - ✔✔If the electronegativities of two
bonded atoms are equal or similar the bond is non polar
Bonding between atoms with different electronegativities gives a polar covalent bond or
dipole
✔✔What does the classification of a molecule as polar or nonpolar depend on? - ✔✔-
The polarity or individual bonds
, - The overall shape of the molecule
✔✔If a molecule is trigonal planar with one polar bond will it be polar or nonpolar? -
✔✔Polar
✔✔If a molecule is trigonal planar with three polar bonds will it be polar or nonpolar? -
✔✔Nonpolar
✔✔If a molecule is trigonal pyramidal with three polar bonds will it be polar or nonpolar?
- ✔✔Polar
✔✔What is kinetic energy? - ✔✔The energy of motion
✔✔What is potential energy? - ✔✔Th energy an object has because of its position or
stored energy
✔✔What are london dispersion forces? - ✔✔Very weak interactions caused by
momentary change
✔✔What compounds exhibit london dispersion forces? - ✔✔ALL covalent compounds
✔✔What are dipole-dipole interactions? - ✔✔The attractive forces between the
permanent dipoles of two or more polar molecules
✔✔What is hydrogen bonding? - ✔✔When a hydrogen atom is bonded to an O, N, or F
✔✔What is the process of changing a solid directly to a gas without passing the liquid
stage? - ✔✔Sublimation
✔✔What is Avogadro's number? - ✔✔6.022E23
✔✔Oxidation is the ________, and reduction is the ________. - ✔✔Loss or electrons,
gain of electrons
✔✔What is Le Chatelier's principle? - ✔✔If a chemical system at equilibrium is
disturbed, the system will react in a direction that counteracts the disturbance.
If you add hydrogen to the left side of the reaction the right side will shift to create
equilibrium.
✔✔What is Boyle's Law? - ✔✔P1V1=P2V2
A fixed amount of gas at constant pressure the pressure and volume of the gas are
inversely related.
QUESTIONS AND ANSWERS SURE A+
✔✔What does trigonal pyramidal look like? - ✔✔An atom surrounded by three groups
and the central atoms contains a lone pair with a bond angle of 107
✔✔What does bent look like? - ✔✔Central atom has two lone pairs and two bonds with
a bond angle of 105
✔✔What is electronegativity? - ✔✔Measure of an atom's attraction for electrons
✔✔What trend does electronegativity follow on the periodic table? - ✔✔Increasing
electronegativity to the right
Increasing electronegativity as it goes up
✔✔How does electronegativity effect polarity? - ✔✔If the electronegativities of two
bonded atoms are equal or similar the bond is non polar
Bonding between atoms with different electronegativities gives a polar covalent bond or
dipole
✔✔What does the classification of a molecule as polar or nonpolar depend on? - ✔✔-
The polarity or individual bonds
, - The overall shape of the molecule
✔✔If a molecule is trigonal planar with one polar bond will it be polar or nonpolar? -
✔✔Polar
✔✔If a molecule is trigonal planar with three polar bonds will it be polar or nonpolar? -
✔✔Nonpolar
✔✔If a molecule is trigonal pyramidal with three polar bonds will it be polar or nonpolar?
- ✔✔Polar
✔✔What is kinetic energy? - ✔✔The energy of motion
✔✔What is potential energy? - ✔✔Th energy an object has because of its position or
stored energy
✔✔What are london dispersion forces? - ✔✔Very weak interactions caused by
momentary change
✔✔What compounds exhibit london dispersion forces? - ✔✔ALL covalent compounds
✔✔What are dipole-dipole interactions? - ✔✔The attractive forces between the
permanent dipoles of two or more polar molecules
✔✔What is hydrogen bonding? - ✔✔When a hydrogen atom is bonded to an O, N, or F
✔✔What is the process of changing a solid directly to a gas without passing the liquid
stage? - ✔✔Sublimation
✔✔What is Avogadro's number? - ✔✔6.022E23
✔✔Oxidation is the ________, and reduction is the ________. - ✔✔Loss or electrons,
gain of electrons
✔✔What is Le Chatelier's principle? - ✔✔If a chemical system at equilibrium is
disturbed, the system will react in a direction that counteracts the disturbance.
If you add hydrogen to the left side of the reaction the right side will shift to create
equilibrium.
✔✔What is Boyle's Law? - ✔✔P1V1=P2V2
A fixed amount of gas at constant pressure the pressure and volume of the gas are
inversely related.
