Intermolecular Forces Flashcards
. Which forces of attraction or repulsion are responsible for the bulk properties
of different substances?
intermolecular
Ion-dipole forces exist among certain species of substances. Which among the pairs of substances exhibit this type of interaction?
potassium ion (K+) and water (H2O)
Why do larger atoms experience increase polarizability than smaller atoms?
The electrons are loosely held in larger atoms so electron distribution is easier to distort.
How is instantaneous dipole best described?
It results to the formation of temporary dipoles induced to atoms or molecules.
Which among the following is the reason why ion-dipole interaction is the strongest among the intermolecular forces?
The oppositely charged end of the dipole is oriented closest to the ion
Which is true about the interaction of substances that exhibit dipole-dipole attractive forces?
The positive (+) end of one dipole aligns to the negative (-) end of another dipole.
Why are dispersion forces always present among all kinds of substances?
There are electron distributions that are distorted by the force exerted by an ion or polar molecule that is placed near an atom or a nonpolar
molecule.
London dispersion forces are a function of the molar mass of substances.
What happens to the dispersion forces of the molecules as the molar mass
increases?
. They are increased
Heat of hydration is the result of favourable interaction between thecations and anions of an ionic compound with water. What is the nature
of this attraction?
dipole-dipole interaction
Which is true about dipole moment?
I. It arises from the similarities in the electronegativity values of
elements.
II. It is the shift of electron density from one atom to a more
electronegative atom.
III. It occurs between two ions in an ionic bond or between atoms in
a covalent bond.
IV. The larger the difference in electronegativity between elements,
the smaller the dipole moment is.
c. II & III
The strength of ion-dipole interaction depends on the ions present.
Which is true about this interaction with ions of the same magnitude?
. Cations interact more strongly than anions because their charges are
more concentrated.
At any certain time the shift in the position of the electrons in an atom
will likely create temporary positive and negative poles. Which among the
following is this kind of dipole?
instantaneous dipole
Which forces of attraction are present between the substances I2and NO3?
London dispersion forces and ion-induced dipole interaction
Which of the following species is capable of hydrogen-bonding among
themselves?
acetic acid (CH3COOH)
Attractive forces between polar molecule
dipole-dipole
