Question 1

Which of the following pairs of elements both exist naturally as diatomic molecules under standard conditions?

Accepted Answer

Nitrogen and Oxygen

Question 2

A sample of a compound contains 40.0 g of carbon, 6.7 g of hydrogen, and 53.3 g of oxygen. What is the empirical formula of the compound?

Accepted Answer

CH\_2O

Question 3

Which of the following best describes the difference between a molecule and a polyatomic ion?

Accepted Answer

A molecule is neutral, while a polyatomic ion carries a charge.

Question 4

Which of the following compounds is ionic?

Accepted Answer

NaCl

Question 5

What is the noble gas configuration for the chloride ion (Cl\^-)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$

Question 6

Which of the following bonds is most ionic?

Accepted Answer

Na--Cl

Question 7

Given the electronegativity values: N = 3.0, H = 2.1, O = 3.5, which bond is most polar?

Accepted Answer

O--H

Question 8

Which molecule violates the octet rule due to an expanded octet?

Accepted Answer

SF\_6

Question 9

What is the formal charge on the central atom in the Lewis structure of NO\_3\^-?

Accepted Answer

$$+1$$

Question 10

Which of the following molecules has resonance structures?

Accepted Answer

O\_3

Question 11

What is the bond order of each N--O bond in the nitrate ion (NO\_3\^-)?

Accepted Answer

$$\frac{4}{3}$$

Question 12

Which geometry and bond angle is predicted by VSEPR for the molecule BF\_3?

Accepted Answer

Trigonal planar, $$120^\circ$$

Question 13

Which molecule is polar due to its molecular geometry?

Accepted Answer

H\_2O

Question 14

Which of the following statements about sigma ($$\sigma) $$and pi ($$\pi) $$bonds is correct?

Accepted Answer

A double bond consists of one $$\sigma$$ bond and one $$\pi$$ bond.

Question 15

Which hybridization and bond angle is found in methane (CH\_4)?

Accepted Answer

sp\^3, $$109.5^\circ$$

Question 16

In ethene (C\_2H\_4), what type of orbital overlap forms the C=C double bond?

Accepted Answer

One $$\sigma$$ bond (sp\^2--sp\^2 overlap) and one $$\pi$$ bond (p--p overlap)

Question 17

Which statement best describes the main difference between Valence Bond Theory and Molecular Orbital Theory?

Accepted Answer

Valence Bond Theory describes bonds as localized between atoms, while Molecular Orbital Theory describes electrons as delocalized over the entire molecule.

Question 18

A compound has an empirical formula of CH\_2 and a molar mass of 56 g/mol. What is its molecular formula?

Accepted Answer

C\_4H\_8

Question 19

Which of the following polyatomic ions contains both covalent and ionic bonds in its structure?

Accepted Answer

SO\_4\^{2-}

Question 20

Which of the following statements about bond length and bond dissociation energy is correct?

Accepted Answer

Shorter bonds have higher bond dissociation energies.

Chemical Bonding, Molecular Structure, and Compounds: Study Guide (Chapters 4–6)

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