Q: Given a dipole moment $$\mu = 3.0\ D$$ and a bond length $$r = 1.0\ \text{\AA}$$, what is the magnitude of the charge separation $$q in $$coulombs? (1 D = $$3.336 \times 10$$^{-30}$$ C·m, 1$$\ \text{\AA} = 1.0 \times $$10^{-10} m)$$

$$q = 1.0 \times 10$$^{-19}$$\ \text{C}$$

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 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass, and a molar mass of 180 g/mol, what is its molecular formula?

Accepted Answer

C$$_6H$_{12}O$_6$$

Question 4

Which of the following is the correct Lewis structure for the nitrate ion (NO$$_3^-$$)?

Accepted Answer

Three resonance structures, each with one N=O double bond and two N–O single bonds, with the negative charge delocalized over the three oxygens.

Question 5

A solution is prepared by dissolving 3.65 g of HCl (molar mass = 36.5 g/mol) in enough water to make 1.00 L of solution. What is the pH of the solution?

Accepted Answer

$$pH = 1.0$$

Question 6

Which of the following best describes the difference between a sigma ($$\sigma) $$and a pi ($$\pi) $$bond in terms of wavefunction overlap?

Accepted Answer

A $$\sigma$$ bond results from head-on overlap of orbitals, while a $$\pi$$ bond results from side-on overlap.

Question 7

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

Accepted Answer

CH$$_3CH$_2CH$_2OH$$

Question 8

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

Accepted Answer

Resonance structures differ only in the placement of electrons, not atoms.

Question 9

Which of the following is the correct formal charge on the central atom in the Lewis structure of SO$$_4$$^{2-}$$ (sulfate ion)?

Accepted Answer

$$+2$$

Question 10

Which of the following is a correct application of the Arrhenius definition of acids and bases?

Accepted Answer

An Arrhenius acid increases $$[H^+] in $$aqueous solution.

Question 11

Which of the following factors would increase the acidity of a molecule?

Accepted Answer

Increasing the electronegativity of atoms adjacent to the acidic hydrogen (inductive effect).

Question 12

Which of the following best explains why acetic acid (CH$$_3$$COOH) is more acidic than ethanol (CH$$_3CH$_2OH$$)?

Accepted Answer

The conjugate base of acetic acid is stabilized by resonance.

Question 13

Which of the following statements about hydrogen bonding is correct?

Accepted Answer

Hydrogen bonding occurs when hydrogen is bonded to highly electronegative atoms such as N, O, or F.

Question 14

Which of the following molecules would be most soluble in water?

Accepted Answer

CH$$_3NH$_2$$

Question 15

Which of the following is the correct order of increasing acid strength for the following hydrides: H$$_2O$$, H$$_2S$$, H$$_2Se$$?

Accepted Answer

H$$_2O$$ \u003c H$$_2S$$ \u003c H$$_2Se$$

Question 16

Which of the following best describes a Lewis base?

Accepted Answer

A species that donates an electron pair.

Question 17

Given a dipole moment $$\mu = 3.0\ D$$ and a bond length $$r = 1.0\ 	ext{\AA}$$, what is the magnitude of the charge separation $$q in $$coulombs? (1 D = $$3.336 	imes 10$$^{-30}$$ C·m, 1$$\ 	ext{\AA} = 1.0 	imes $$10^{-10} m)$$

Accepted Answer

$$q = 1.0 	imes 10$$^{-19}$$\ 	ext{C}$$

Question 18

Which of the following molecules exhibits only London dispersion forces as its primary intermolecular force?

Accepted Answer

CH$$_4$$

Question 19

Which of the following statements about antibonding molecular orbitals is correct?

Accepted Answer

Antibonding orbitals have a node between the nuclei where electron density is zero.

Question 20

Which of the following correctly ranks the boiling points of the following compounds from lowest to highest: CH$$_4$$, CH$$_3Cl$$, CH$$_3OH$$?

Accepted Answer

CH$$_4$$ \u003c CH$$_3Cl$$ \u003c CH$$_3OH$$

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

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