Question 1

Which of the following statements best explains why fluorine is the most electronegative element?

Accepted Answer

Fluorine has a high number of valence electrons and a small atomic radius, maximizing its attraction for bonding electrons.

Question 2

A molecule of carbon dioxide (CO2) is nonpolar, even though it contains polar bonds. Which feature of its structure explains this property?

Accepted Answer

CO2 has a linear geometry, and the bond dipoles are equal and opposite, canceling each other out.

Question 3

Which of the following is the correct condensed electron configuration for sulfur (Z = 16)?

Accepted Answer

[Ne] 3s2 3p4

Question 4

A student draws a Lewis structure for the nitrate ion (NO3-) with one double bond between N and O, and two single bonds to the other oxygens. What is the significance of drawing all possible resonance structures for this ion?

Accepted Answer

It demonstrates that the actual structure is a hybrid, with the double bond delocalized over all three oxygens.

Question 5

Which of the following molecules is expected to be polar based on its shape and the presence of lone pairs?

Accepted Answer

Ammonia (NH3)

Question 6

What is the formal charge on the oxygen atom in methanol (CH3OH), given that oxygen has 6 valence electrons, 2 lone pairs, and forms two single bonds?

Accepted Answer

0

Question 7

Which hybridization and geometry best describe the central atom in phosgene (COCl2)?

Accepted Answer

sp2, trigonal planar

Question 8

A molecule has three electron groups around the central atom, one of which is a lone pair. What is the expected molecular geometry and polarity?

Accepted Answer

Bent, polar

Question 9

Which of the following functional groups is present in acetone (CH3COCH3)?

Accepted Answer

Ketone

Question 10

A patient is exposed to phosgene (COCl2), a toxic gas. Which property of phosgene's molecular structure contributes to its reactivity with biological molecules?

Accepted Answer

It has a polar carbonyl group, which is highly electrophilic and can react with nucleophilic sites in proteins.

Question 11

Which of the following best describes the difference between a lone pair and a shared pair of electrons in a Lewis structure?

Accepted Answer

A lone pair is localized on one atom and not involved in bonding, while a shared pair forms a covalent bond between two atoms.

Question 12

Which of the following molecules contains a carbon atom with sp hybridization?

Accepted Answer

Acetylene (C2H2)

Question 13

A student is asked to draw the Lewis structure for the thiocyanate ion (NCS-). Which of the following is true about the formal charges in the most stable structure?

Accepted Answer

All atoms have a formal charge of zero.

Question 14

Which of the following statements about resonance structures is correct?

Accepted Answer

The actual molecule is a hybrid of all valid resonance structures, with electrons delocalized.

Question 15

Which of the following best explains why water (H2O) is a polar molecule?

Accepted Answer

Water has a bent geometry due to two lone pairs on oxygen, resulting in an uneven charge distribution.

Question 16

Which functional group is present in the amino acid glycine (NH2CH2COOH)?

Accepted Answer

Amine and carboxylic acid

Question 17

If a molecule has four electron groups (including lone pairs) around the central atom, what is its expected hybridization and ideal bond angle?

Accepted Answer

sp3, 109.5°

Question 18

Which of the following best describes the trend in electronegativity across the periodic table?

Accepted Answer

It increases from left to right and decreases down a group.

Question 19

A molecule has a central atom with two bonding pairs and two lone pairs. What is the molecular geometry and is the molecule polar or nonpolar?

Accepted Answer

Bent, polar

Question 20

Which of the following is the correct order for drawing a Lewis dot structure for a molecule?

Accepted Answer

Determine valence electrons, connect atoms with single bonds, add lone pairs, complete octets, check formal charges.

Atomic Structure, Bonding, and Molecular Properties: Study Notes for General Biology

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