Question 1

Which of the following statements best explains why sodium chloride (NaCl) is a solid at room temperature while methane (CH4) is a gas, based on their bonding and structure?

Accepted Answer

NaCl forms a lattice of ions held together by strong electrostatic forces, while CH4 consists of discrete molecules held together by weak London dispersion forces.

Question 2

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Orbital quantum number ($$l)$$

Question 3

According to the Pauli exclusion principle, which of the following is true for electrons in an atom?

Accepted Answer

No two electrons can have the same set of four quantum numbers.

Question 4

Which of the following best describes the difference between a double bond and a triple bond in terms of shared electrons?

Accepted Answer

A double bond shares four electrons, while a triple bond shares six electrons.

Question 5

Which of the following molecules is expected to have a net dipole moment of zero?

Accepted Answer

Carbon tetrachloride ($$\mathrm{$$CCl_4$$})$$

Question 6

Which factor most strongly increases the acidity of a proton in a molecule?

Accepted Answer

Resonance stabilization of the conjugate base

Question 7

What is the formal charge on the nitrogen atom in ammonium ion ($$\mathrm{NH_4$^+}$$)?

Accepted Answer

$$+1$$

Question 8

Which of the following is a valid resonance structure for the carbonate ion ($$\mathrm{CO_3$^{2-}}$$)?

Accepted Answer

A structure where the negative charge is delocalized over all three oxygen atoms.

Question 9

Which of the following best describes the effect of electronegativity on bond polarity?

Accepted Answer

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

Question 10

Which of the following is NOT a rule for drawing valid resonance structures?

Accepted Answer

Second-row elements may exceed the octet rule.

Question 11

Which of the following best explains why trifluoroethanol ($$\mathrm{CF_3CH_2OH}) is a $$much stronger acid than ethanol ($$\mathrm{CH_3CH_2OH}$$)?

Accepted Answer

The inductive effect of the fluorine atoms stabilizes the conjugate base.

Question 12

Which of the following is a Lewis acid in the reaction between $$\mathrm{BF_3$}$$ and diethyl ether ($$\mathrm{$$OEt_2$$}$$)?

Accepted Answer

$$\mathrm{BF_3$}$$

Question 13

Which of the following best describes a constitutional isomer?

Accepted Answer

Compounds with the same molecular formula but different connectivity of atoms.

Question 14

Which of the following statements about VSEPR theory is correct?

Accepted Answer

Electron pairs around a central atom arrange themselves to minimize repulsion.

Question 15

Which of the following curved arrow conventions is correct for showing electron movement in organic reaction mechanisms?

Accepted Answer

A full-headed arrow starts at an electron source and ends at an electron sink.

Question 16

Which of the following best describes the relationship between $$K_a$$ and $$pK_a$$ for an acid?

Accepted Answer

$$pK_a = -\log_{10} K_a$$

Question 17

Which of the following statements about acid-base equilibria is correct?

Accepted Answer

The equilibrium favors the side with the weaker acid (higher $$pK_a).$$

Question 18

Which of the following is a correct statement about the electron configuration of oxygen?

Accepted Answer

Oxygen has the electron configuration $$1s^2$$\ $$2s^2$$\ $$2p^4$$

Question 19

Which of the following best describes the effect of resonance on molecular stability?

Accepted Answer

Resonance delocalizes charge and stabilizes the molecule.

Chapter 1: Structure Determines Properties – Foundations of Atomic and Molecular Structure

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