Question 1

Which of the following bonds is the most polar, based on the electronegativity values provided in the periodic table?

Accepted Answer

$$\mathrm{H-F}$$

Question 2

What is the molecular shape of $$\mathrm{SO_2$}$$ according to VSEPR theory?

Accepted Answer

Bent

Question 3

Which of the following molecules is nonpolar, despite containing polar bonds?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 4

A molecule of $$\mathrm{CH_4$}$$ has which of the following molecular shapes and bond angles?

Accepted Answer

Tetrahedral, $$109^\circ$$

Question 5

Which type of intermolecular force is primarily responsible for the high boiling point of water ($$\mathrm{H_2O}$$)?

Accepted Answer

Hydrogen bonding

Question 6

Given the following electronegativity values: $$\mathrm{K} = 0.8$$, $$\mathrm{N} = 3.0$$, what type of bond is formed between potassium and nitrogen?

Accepted Answer

Ionic

Question 7

Which of the following molecules has a trigonal pyramidal shape?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 8

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity increases from left to right across a period and from bottom to top in a group.

Question 9

Which of the following best describes the main attractive force in a sample of $$\mathrm{Br_2$} ($$liquid bromine)?

Accepted Answer

Dispersion forces

Question 10

A molecule of $$\mathrm{H_2S}$$ has how many electron groups and what molecular shape?

Accepted Answer

Four electron groups, bent

Question 11

Which of the following molecules is polar?

Accepted Answer

$$\mathrm{HCl}$$

Question 12

What is the main reason that $$\mathrm{CO_2$} is a $$nonpolar molecule, even though it contains polar bonds?

Accepted Answer

The molecule is linear and the bond dipoles cancel each other out.

Question 13

Which of the following compounds will have the highest melting point due to the type of attractive forces present?

Accepted Answer

$$\mathrm{KCl}$$

Question 14

Which of the following best describes the electron arrangement and molecular shape of $$\mathrm{PF_3$}$$?

Accepted Answer

Four electron groups, trigonal pyramidal

Question 15

Which of the following is a correct statement about hydrogen bonding?

Accepted Answer

It is the strongest force between molecules and occurs when hydrogen is bonded to F, O, or N.

Question 16

Which of the following molecules has a bond angle closest to $$120^\circ$$?

Accepted Answer

$$\mathrm{H_2CO}$$

Question 17

Which of the following best explains why $$\mathrm{NH_3$} is $$polar?

Accepted Answer

It has polar bonds and a trigonal pyramidal shape, so the dipoles do not cancel.

Question 18

Which of the following statements about dispersion forces is correct?

Accepted Answer

They are weak attractions caused by temporary dipoles in nonpolar molecules.

Question 19

Which of the following best describes the type of bond and electron sharing in a $$\mathrm{Cl_2$}$$ molecule?

Accepted Answer

Nonpolar covalent bond; electrons shared equally

Question 20

Which of the following molecules will have the strongest dipole-dipole attractions?

Accepted Answer

$$\mathrm{HCl}$$

Electronegativity, Bond Polarity, Molecular Shape, and Intermolecular Forces

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