Question 1

Which of the following statements best explains why carbon is the central element in organic chemistry?

Accepted Answer

Carbon atoms can form up to four covalent bonds by sharing electrons, allowing for a vast diversity of stable compounds.

Question 2

Which of the following is the correct ground-state electronic configuration for a neutral nitrogen atom?

Accepted Answer

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

Question 3

Which of the following best describes the difference between isotopes of carbon?

Accepted Answer

They have different numbers of neutrons.

Question 4

Which of the following bonds is the most polar based on electronegativity differences?

Accepted Answer

$$\mathrm{H-Cl}$$

Question 5

A molecule of methane ($$\mathrm{CH_4$}) $$has which of the following molecular geometries and bond angles?

Accepted Answer

Tetrahedral, $$109.5^\circ$$

Question 6

Which of the following statements about the formation of a covalent bond is correct?

Accepted Answer

A covalent bond forms when two atoms share one or more pairs of electrons.

Question 7

Which of the following best describes the hybridization of the central carbon atom in ethene ($$\mathrm{C_2H_4}$$)?

Accepted Answer

$$sp^2$$

Question 8

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

Accepted Answer

$$+1$$

Question 9

Which of the following statements about bond order, bond length, and bond strength is correct?

Accepted Answer

A double bond is shorter and stronger than a single bond.

Question 10

Which of the following molecules is expected to have no net dipole moment due to its symmetry?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 11

Which of the following best explains why the bond angle in water ($$\mathrm{H_2O}) is $$less than the tetrahedral angle?

Accepted Answer

The lone pairs on oxygen repel the bonding pairs, reducing the bond angle.

Question 12

Which of the following is the correct condensed structure for ethanol?

Accepted Answer

$$\mathrm{CH_3CH_2OH}$$

Question 13

Which of the following best describes the effect of increasing s character in a hybrid orbital?

Accepted Answer

The bond becomes shorter and stronger.

Question 14

Which of the following is a correct statement about the Pauli exclusion principle?

Accepted Answer

No more than two electrons can occupy the same atomic orbital, and they must have opposite spins.

Question 15

Which of the following best describes the bonding in ethyne ($$\mathrm{C_2H_2}$$)?

Accepted Answer

Each carbon is $$sp$$ hybridized and forms two pi bonds and one sigma bond.

Question 16

Which of the following is the correct Lewis structure for the hydroxide ion ($$\mathrm{OH^-}$$)?

Accepted Answer

O with three lone pairs and a single bond to H, with a negative charge on O

Question 17

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

Accepted Answer

A sigma bond is formed by end-to-end overlap of orbitals, while a pi bond is formed by side-to-side overlap of p orbitals.

Question 18

Which of the following is the correct formal charge on the central atom in the nitrate ion ($$\mathrm{NO_3$^-}) $$when drawn with one double bond and two single bonds?

Accepted Answer

+1

Question 19

Which of the following best explains why phosphorus and sulfur can have expanded octets?

Accepted Answer

They have available d orbitals that can accommodate extra electrons.

Chapter 1: Remembering General Chemistry – Electronic Structure and Bonding

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