UNE chem 1011 midterm Questions With
Complete Solutions
The phase in which a substance exists depends on the relative
extents of its- correct answer: Intermolecular forces and kinetic
energies of its molecules
van der Waals forces correct answer: a slight attraction that
develops between the oppositely charged regions of nearby
molecules
Londen dispersion forces correct answer: attraction between
two rapidly fluctuating, temporary dipoles; significant only
when particles are very close together
instantaneous dipole correct answer: a fleeting nonuniform
distribution of electron density in a molecule without a
permanent dipole
The presence of this dipole can, in turn, distort the electrons of a
neighboring atom or molecule, producing an induced dipole.
correct answer: Instantaneous dipole
Do larger/ heavier molecules or lighter/smaller molecules have
stronger IMFs? correct answer: Larger/heavier
The measure of how easy or difficult it is for another
electrostatic charge (for example, a nearby ion or polar
, molecule) to distort a molecule's charge distribution (its electron
cloud) is known as correct answer: Polarizability
melting/boiling point (increases/decreases) with increasing size
correct answer: Increases
eIn a larger atom, the valence electrons are, on average, farther
from the nuclei than in a smaller atom. Thus, they are less
tightly held and can more correct answer: Easily form the
temporary dipoles that produce the atteaction
Greater surface area= stronger or weaker imfs? correct answer:
Stronger
Recall from the chapter on chemical bonding and molecular
geometry that polar molecules have a partial positive charge on
one side and a partial negative charge on the other side of the
molecule—a separation of charge called correct answer: A
dipole
The more electronegative atom bears the (blank) charge correct
answer: Partial Negative.
less electronegative bears the (blank) charge correct answer:
Partially positive
dipole-dipole forces correct answer: attractions between
oppositely charged regions of polar molecules
Which of the following statements is/are true?
a) Methane will dissolve completely in acetone, CH3COCH3.
Complete Solutions
The phase in which a substance exists depends on the relative
extents of its- correct answer: Intermolecular forces and kinetic
energies of its molecules
van der Waals forces correct answer: a slight attraction that
develops between the oppositely charged regions of nearby
molecules
Londen dispersion forces correct answer: attraction between
two rapidly fluctuating, temporary dipoles; significant only
when particles are very close together
instantaneous dipole correct answer: a fleeting nonuniform
distribution of electron density in a molecule without a
permanent dipole
The presence of this dipole can, in turn, distort the electrons of a
neighboring atom or molecule, producing an induced dipole.
correct answer: Instantaneous dipole
Do larger/ heavier molecules or lighter/smaller molecules have
stronger IMFs? correct answer: Larger/heavier
The measure of how easy or difficult it is for another
electrostatic charge (for example, a nearby ion or polar
, molecule) to distort a molecule's charge distribution (its electron
cloud) is known as correct answer: Polarizability
melting/boiling point (increases/decreases) with increasing size
correct answer: Increases
eIn a larger atom, the valence electrons are, on average, farther
from the nuclei than in a smaller atom. Thus, they are less
tightly held and can more correct answer: Easily form the
temporary dipoles that produce the atteaction
Greater surface area= stronger or weaker imfs? correct answer:
Stronger
Recall from the chapter on chemical bonding and molecular
geometry that polar molecules have a partial positive charge on
one side and a partial negative charge on the other side of the
molecule—a separation of charge called correct answer: A
dipole
The more electronegative atom bears the (blank) charge correct
answer: Partial Negative.
less electronegative bears the (blank) charge correct answer:
Partially positive
dipole-dipole forces correct answer: attractions between
oppositely charged regions of polar molecules
Which of the following statements is/are true?
a) Methane will dissolve completely in acetone, CH3COCH3.
