Question 1

Which of the following best describes the molecular geometry around the central carbon atom in methane ($\mathrm{CH_4}$)?

Accepted Answer

Tetrahedral

Question 2

Given the Lewis structure of ammonia ($\mathrm{NH_3}$), what is the approximate bond angle between the hydrogen atoms?

Accepted Answer

$109.5^\circ$

Question 3

Which statement correctly describes the electron domain geometry and molecular geometry of water ($\mathrm{H_2O}$)?

Accepted Answer

Electron domain geometry is tetrahedral; molecular geometry is bent

Question 4

A molecule has the formula $\mathrm{CO_2}$. What is the molecular geometry and bond angle of this molecule?

Accepted Answer

Linear, $180^\circ$

Question 5

Which of the following molecules contains a lone pair on the central atom and has a trigonal pyramidal molecular geometry?

Accepted Answer

$\mathrm{NH_3}$

Question 6

If a molecule has four electron domains around the central atom, but only three are bonding pairs, what is the expected molecular geometry?

Accepted Answer

Trigonal pyramidal

Question 7

Which of the following best explains why the bond angle in water ($\mathrm{H_2O}$) is less than the ideal tetrahedral angle?

Accepted Answer

Repulsion from lone pairs on the oxygen atom

Question 8

A student draws the Lewis structure for $\mathrm{NH_3}$ and claims the molecule is planar. Which concept disproves this claim?

Accepted Answer

The presence of a lone pair on nitrogen causes a trigonal pyramidal shape

Question 9

Which of the following molecules is nonpolar despite having polar bonds?

Accepted Answer

$\mathrm{CO_2}$

Question 10

Consider the Lewis structure of $\mathrm{CH_4}$. If one hydrogen atom is replaced by a chlorine atom, what is the expected effect on the molecular polarity?

Accepted Answer

The molecule becomes polar due to the difference in electronegativity

Question 11

Which of the following best describes the hybridization of the central atom in ammonia ($\mathrm{NH_3}$)?

Accepted Answer

$sp^3$

Question 12

A molecule has two bonding pairs and two lone pairs on the central atom. What is its molecular geometry?

Accepted Answer

Bent

Question 13

Which molecule would you expect to have the largest bond angle?

Accepted Answer

$\mathrm{CH_4}$

Question 14

Which of the following statements about $\mathrm{CO_2}$ is correct?

Accepted Answer

It is a linear molecule with two double bonds

Question 15

Which of the following molecules has a net dipole moment?

Accepted Answer

$\mathrm{NH_3}$

Question 16

A patient is exposed to high concentrations of $\mathrm{CO_2}$. Which property of $\mathrm{CO_2}$ allows it to diffuse rapidly across cell membranes?

Accepted Answer

Its nonpolar nature and small size

Question 17

Which molecule would you expect to have the highest boiling point due to hydrogen bonding?

Accepted Answer

$\mathrm{NH_3}$

Question 18

If the central atom in a molecule has three bonding pairs and one lone pair, what is the expected bond angle?

Accepted Answer

$107^\circ$

Question 19

Which of the following molecules is expected to be the most soluble in water?

Accepted Answer

$\mathrm{NH_3}$

Question 20

A chemist wants to synthesize a molecule with a tetrahedral electron domain geometry but a bent molecular geometry. Which combination of bonding and lone pairs should they use?

Accepted Answer

Two bonding pairs, two lone pairs

Organic Structure and Nomenclature: Study Notes

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