Intermolecular Forces

Question 1

. Which forces of attraction or repulsion are responsible for the bulk properties
of different substances?

Answer 1

intermolecular

Question 2

Ion-dipole forces exist among certain species of substances. Which among the pairs of substances exhibit this type of interaction?

Answer 2

potassium ion (K+) and water (H2O)

Question 3

Why do larger atoms experience increase polarizability than smaller atoms?

Answer 3

The electrons are loosely held in larger atoms so electron distribution is easier to distort.

Question 4

How is instantaneous dipole best described?

Answer 4

It results to the formation of temporary dipoles induced to atoms or molecules.

Question 5

Which among the following is the reason why ion-dipole interaction is the strongest among the intermolecular forces?

Answer 5

The oppositely charged end of the dipole is oriented closest to the ion

Question 6

Which is true about the interaction of substances that exhibit dipole-dipole attractive forces?

Answer 6

The positive (+) end of one dipole aligns to the negative (-) end of another dipole.

Question 7

Why are dispersion forces always present among all kinds of substances?

Answer 7

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.

Question 8

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?

Answer 8

. They are increased

Question 9

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?

Answer 9

dipole-dipole interaction

Question 10

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.

Answer 10

c. II & III

Question 11

The strength of ion-dipole interaction depends on the ions present.
Which is true about this interaction with ions of the same magnitude?

Answer 11

. Cations interact more strongly than anions because their charges are
more concentrated.

Question 12

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?

Answer 12

instantaneous dipole

Question 13

Which forces of attraction are present between the substances I2and NO3?

Answer 13

London dispersion forces and ion-induced dipole interaction

Question 14

Which of the following species is capable of hydrogen-bonding among
themselves?

Answer 14

acetic acid (CH3COOH)

Question 15

Attractive forces between polar molecule

Answer 15

dipole-dipole

Question 16

Electrostatic attraction between an ion
and a polar molecule

Answer 16

ion-dipole

Question 17

Favorable interaction between the ions
of an ionic compound and water

Answer 17

hydration

Question 18

Distortion of the electron distribution
of an atom or molecule brought about
by an ion or a polar molecule

Answer 18

dispersion forces

Question 19

What is true about intermolecular forces?

Answer 19

They are weaker than the intramolecular forces between atoms.

Question 20

When will ion-dipole interaction most likely to happen?

Answer 20

If there is an attraction between an ion and a polar molecule

Question 21

Why are dispersion forces high in molecules with a great number of electrons?

Answer 21

The electron distribution of big molecules is easily polarized