Question 1

Which of the following best explains why water (H2O) is a polar molecule, while carbon dioxide (CO2) is nonpolar, even though both contain polar bonds?

Accepted Answer

Water has a bent molecular geometry, causing the dipole moments to add up, while CO2 has a linear geometry, causing the dipole moments to cancel.

Question 2

Which of the following statements about Lewis structures is correct?

Accepted Answer

Lewis structures show the arrangement of valence electrons as dots around the element symbols.

Question 3

What is the correct Lewis structure for the cyanide ion (CN−)?

Accepted Answer

$$[\cdot\mathrm{C}\equiv\mathrm{N}\cdot]^{-}$$

Question 4

Which of the following molecules is expected to have a trigonal planar geometry according to VSEPR theory?

Accepted Answer

$$\mathrm{H}_2\mathrm{CO}$$

Question 5

Which of the following best describes the difference between ionic and covalent bonds according to Lewis theory?

Accepted Answer

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

Question 6

Which of the following elements is most likely to form compounds with an expanded octet?

Accepted Answer

Sulfur (S)

Question 7

A molecule has the Lewis structure shown below. What is the molecular geometry of this molecule?

$$\mathrm{H}-\mathrm{O}-\mathrm{H} ($$with two lone pairs on O)

Accepted Answer

Bent

Question 8

Which of the following best explains why oil and water do not mix?

Accepted Answer

Water molecules are polar and oil molecules are nonpolar, causing them to separate due to differences in intermolecular attractions.

Question 9

Which of the following is the correct order of bond strength from weakest to strongest for single, double, and triple bonds between the same two atoms?

Accepted Answer

Single \u003c Double \u003c Triple

Question 10

Which of the following is a correct statement about resonance structures?

Accepted Answer

Resonance structures are different possible Lewis structures for the same molecule, and the true structure is an average of these.

Question 11

Which of the following best describes the role of electronegativity in determining bond polarity?

Accepted Answer

The greater the difference in electronegativity between two atoms, the more polar the bond.

Question 12

Which of the following molecules contains a polar covalent bond but is overall nonpolar?

Accepted Answer

$$\mathrm{CO}_2$$

Question 13

Which of the following is the correct Lewis structure for magnesium oxide (MgO)?

Accepted Answer

$$\mathrm{Mg}^{2+} [\cdot\cdot\mathrm{O}\cdot\cdot]^{2-}$$

Question 14

Which of the following best describes why artificial sweeteners like aspartame taste sweet but have few or no calories?

Accepted Answer

They fit into the taste receptor's active site due to their molecular shape but are not metabolized (or are metabolized to a lesser extent) by the body.

Question 15

Which of the following is an exception to the octet rule?

Accepted Answer

$$\mathrm{BF}_3$$

Question 16

Which of the following best describes the function of soap in removing grease from hands?

Accepted Answer

Soap molecules have a polar head that interacts with water and a nonpolar tail that interacts with grease, allowing water and grease to mix.

Question 17

Which of the following is the correct Lewis structure for a chlorine molecule (Cl2)?

Accepted Answer

Both $$\mathrm{Cl} : \mathrm{Cl}$$ and $$\mathrm{Cl} - \mathrm{Cl}$$ are correct representations.

Question 18

Which of the following best describes a free radical?

Accepted Answer

A molecule with an odd number of valence electrons and an unpaired electron.

Question 19

Which of the following is the correct Lewis structure for phosphorus (P)?

Accepted Answer

The symbol P with five dots around it.

Chapter 10: Chemical Bonding – Structured Study Notes

Study Guide - Practice Questions

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