Q: A covalent bond has a dipole moment of $$2.0\ \mathrm{D} ($$debye) and a bond length of $$1.0\ \mathrm{\AA}$$ ($$1.0 \times 10$$^{-10}$$\ \mathrm{m}). $$What is the magnitude of the charge separation in coulombs?

$$6.67 \times 10$$^{-20}$$\ \mathrm{C}$$

Question 1

Which of the following is the correct electronic configuration for nitrogen (atomic number 7)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^3$$

Question 2

Which of the following molecules violates the octet rule?

Accepted Answer

BF$$_3$$

Question 3

Given a compound with the molecular formula C$$_2H$_6O$$, which of the following is the correct line structure for ethanol?

Accepted Answer

A two-carbon chain with an -OH group attached to the terminal carbon

Question 4

A sample contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. If the molar mass is 60 g/mol, what is the molecular formula?

Accepted Answer

C$$_2H$_4O$_2$$

Question 5

Calculate the pH of a solution made by dissolving 0.365 g of HCl (strong acid, $$M = 36.5\ \mathrm{g/mol}) in $$enough water to make 1.00 L of solution.

Accepted Answer

$$1.00$$

Question 6

Which of the following bonds is the most polar?

Accepted Answer

O-H

Question 7

What is the formal charge on the nitrogen atom in the ammonium ion ($$\mathrm{NH}_4^+$$)?

Accepted Answer

$$+1$$

Question 8

Which of the following is NOT a valid resonance structure for the acetate ion ($$\mathrm{CH}_3COO^-$$)?

Accepted Answer

A structure with both oxygens double-bonded to the central carbon and no negative charge

Question 9

Which of the following best explains why the conjugate base of phenol is more stable than the conjugate base of cyclohexanol?

Accepted Answer

Resonance stabilization in the phenoxide ion

Question 10

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

Accepted Answer

A bond formed by head-on overlap of atomic orbitals along the internuclear axis

Question 11

Which of the following molecules would have the highest boiling point?

Accepted Answer

CH$$_3CH$_2OH$$

Question 12

Which of the following is a correct statement about hydrogen bonding?

Accepted Answer

It occurs when hydrogen is bonded to highly electronegative atoms like N, O, or F

Question 13

According to the Bronsted-Lowry definition, which of the following is a base?

Accepted Answer

NH$$_3$$

Question 14

Which of the following factors increases the acidity of a molecule?

Accepted Answer

Increasing s-character in the atom bearing the negative charge

Question 15

Which of the following statements about solubility is correct?

Accepted Answer

Polar compounds are more soluble in polar solvents due to dipole-dipole interactions

Question 16

Which of the following is the correct Lewis structure for carbon dioxide (CO$$_2$$)?

Accepted Answer

O=C=O, with each O atom having two lone pairs

Question 17

Which of the following best describes the effect of induction on acidity?

Accepted Answer

Electron-withdrawing groups increase acidity by stabilizing the conjugate base

Question 18

Which of the following is a Lewis acid?

Accepted Answer

BF$$_3$$

Question 19

A covalent bond has a dipole moment of $$2.0\ \mathrm{D} ($$debye) and a bond length of $$1.0\ \mathrm{\AA}$$ ($$1.0 	imes 10$$^{-10}$$\ \mathrm{m}). $$What is the magnitude of the charge separation in coulombs?

Accepted Answer

$$6.67 	imes 10$$^{-20}$$\ \mathrm{C}$$

Question 20

Which of the following best describes an antibonding molecular orbital?

Accepted Answer

A molecular orbital formed by out-of-phase overlap of atomic orbitals, resulting in a node between nuclei

Exam I Study Guide: Structure, Bonding, Acids & Bases, and Intermolecular Forces

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