Question 1

Which of the following best defines electronegativity?

Accepted Answer

The tendency of an atom to attract electrons in a chemical bond.

Question 2

Why does electronegativity decrease as you move down a group in the periodic table?

Accepted Answer

Because additional electron shells reduce the nucleus's pull on bonding electrons.

Question 3

Which of the following elements is the most electronegative?

Accepted Answer

Fluorine ($$F)$$

Question 4

Arrange the following elements in order of increasing electronegativity: $$Br$$, $$N$$, $$Li$$, $$Al.$$

Accepted Answer

$$Li \u003c Al \u003c Br \u003c N$$

Question 5

Which of the following molecules is polar?

Accepted Answer

$$H_2O$$

Question 6

What is a dipole in the context of chemical bonding?

Accepted Answer

A molecule with a positive and a negative end due to unequal electron sharing.

Question 7

Which intermolecular force is the strongest?

Accepted Answer

Ionic bond

Question 8

Which type of intermolecular force is present in all molecules, regardless of polarity?

Accepted Answer

London dispersion force

Question 9

Why are London dispersion forces generally weaker than dipole-dipole forces and hydrogen bonds?

Accepted Answer

They result from temporary, fluctuating dipoles.

Question 10

Which of the following molecules can form hydrogen bonds?

Accepted Answer

$$NH_3$$

Question 11

Which molecule would have the highest boiling point due to intermolecular forces?

Accepted Answer

$$NH_3$$

Question 12

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond where electrons are shared unequally, creating partial charges.

Question 13

Which intermolecular force is responsible for the high boiling point of water?

Accepted Answer

Hydrogen bonding

Question 14

What is the molecular shape of $$CH_4$$ according to VSEPR theory?

Accepted Answer

Tetrahedral

Question 15

Which of the following best explains why $$H_2O is $$polar but $$CO_2 is $$nonpolar?

Accepted Answer

$$H_2O$$ has a bent shape, causing dipoles to not cancel; $$CO_2 is $$linear, so dipoles cancel.

Question 16

Which of the following statements about dipole-dipole forces is correct?

Accepted Answer

They occur between molecules with permanent dipoles.

Question 17

Which of the following best describes the partial charges in a water molecule?

Accepted Answer

The hydrogen atoms are partially positive, and the oxygen atom is partially negative.

Question 18

Which of the following is a real-life example of a dipole-dipole interaction?

Accepted Answer

The attraction between two $$HCl$$ molecules.

Question 19

Which of the following best explains why ionic bonds are stronger than hydrogen bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons, creating full charges.

Question 20

Which of the following molecules is nonpolar?

Accepted Answer

$$CO_2$$

Electronegativity, Molecular Polarity, and Intermolecular Forces: Study Guide

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