Question 1

Which of the following molecules is nonpolar, despite containing polar bonds, due to its molecular geometry?

Accepted Answer

CO$_2$

Question 2

What is the hybridization of the central atom in BF$_3$?

Accepted Answer

$sp^2$

Question 3

A molecule has four electron groups around its central atom, two of which are lone pairs. What is its molecular geometry and approximate bond angle?

Accepted Answer

Bent, 104.5$^\circ$

Question 4

Which of the following statements about resonance structures is TRUE?

Accepted Answer

Resonance delocalizes electrons and increases molecular stability.

Question 5

How many sigma ($\sigma$) and pi ($\pi$) bonds are present in a molecule of N$_2$?

Accepted Answer

1 $\sigma$, 2 $\pi$

Question 6

A gas sample exerts a pressure of 0.65 atm. What is this pressure in mmHg?

Accepted Answer

$0.65 	imes 760 = 494$ mmHg

Question 7

Which of the following molecules has a trigonal pyramidal molecular geometry?

Accepted Answer

NH$_3$

Question 8

What is the electron geometry and hybridization of the central atom in CO$_2$?

Accepted Answer

Linear, $sp$

Question 9

Which of the following best explains why H$_2$O is a polar molecule?

Accepted Answer

It has polar bonds and a bent geometry, so dipoles do not cancel.

Question 10

Which molecule below exhibits resonance and has equalized bond lengths as a result?

Accepted Answer

SO$_2$

Question 11

A molecule has five electron groups around its central atom, all of which are bonding pairs. What is its electron geometry and bond angles?

Accepted Answer

Trigonal bipyramidal, 90$^\circ$ and 120$^\circ$

Question 12

Which of the following best describes the difference between electron geometry and molecular geometry?

Accepted Answer

Electron geometry considers all electron groups, while molecular geometry considers only the arrangement of atoms.

Question 13

Which of the following molecules is expected to be nonpolar due to its symmetry, even though it contains polar bonds?

Accepted Answer

CH$_4$

Question 14

How many electron groups are around the central atom in SF$_6$, and what is its hybridization?

Accepted Answer

6 electron groups, $sp^3d^2$ hybridization

Question 15

Which of the following best describes a pi ($\pi$) bond?

Accepted Answer

A bond formed by side-to-side overlap of p orbitals.

Question 16

A student draws two valid Lewis structures for O$_3$ (ozone) that differ only in the placement of double and single bonds. What concept does this illustrate?

Accepted Answer

Resonance

Question 17

Which of the following is NOT a property of gases?

Accepted Answer

Gases have a fixed volume.

Question 18

A molecule has three electron groups: two bonding pairs and one lone pair. What is its molecular geometry?

Accepted Answer

Bent

Question 19

Which of the following best explains why the bond angle in NH$_3$ is less than 109.5$^\circ$?

Accepted Answer

Lone pair-bond pair repulsion is greater than bond pair-bond pair repulsion.

Question 20

Which of the following pressure values is equivalent to 1 atm?

Accepted Answer

101.325 kPa

General Chemistry Study Guide: Molecular Geometry, Bonding Theories, and Gas Properties

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