Question 1

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

Accepted Answer

Carbon forms four strong 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 carbon atom?

Accepted Answer

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

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 principle states that no more than two electrons can occupy the same atomic orbital?

Accepted Answer

Pauli exclusion principle

Question 5

A fluorine atom achieves a filled outer shell by:

Accepted Answer

Gaining one electron

Question 6

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

Accepted Answer

$$\mathrm{H-Cl}$$

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 correctly describes the hybridization and geometry of the carbon atom in methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

sp$$^3$$ hybridized, tetrahedral geometry

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 does NOT have a dipole moment?

Accepted Answer

Carbon dioxide ($$\mathrm{CO_2$})$$

Question 11

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

Accepted Answer

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

Question 12

Which of the following is the correct Lewis structure for the nitrate ion ($$\mathrm{NO_3$^-}$$)?

Accepted Answer

Nitrogen with one double bond and two single bonds to oxygen, with appropriate formal charges.

Question 13

Which of the following statements about hybridization is correct?

Accepted Answer

sp hybrid orbitals have 50% s character.

Question 14

Which of the following best describes the bonding in ethene ($$\mathrm{C_2H_4}$$)?

Accepted Answer

Each carbon is sp$$^2$$ hybridized, forming three sigma bonds and one pi bond.

Question 15

Which of the following is a correct application of Hund’s rule?

Accepted Answer

Electrons occupy empty degenerate orbitals singly before pairing up.

Question 16

Which of the following best explains why the bond in hydrogen fluoride ($$\mathrm{HF}) is $$much stronger than the bond in hydrogen iodide ($$\mathrm{HI}$$)?

Accepted Answer

The bond in HF is shorter due to the smaller size of fluorine, increasing bond strength.

Question 17

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

Accepted Answer

$$\mathrm{CH_3CH_2OH}$$

Question 18

Which of the following statements about molecular orbitals is correct?

Accepted Answer

A sigma ($$\sigma) $$bond results from end-to-end overlap of orbitals, while a pi ($$\pi) $$bond results from side-to-side overlap of p orbitals.

Question 19

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

Accepted Answer

Bond length decreases and bond strength increases.

Chapter 1: Remembering General Chemistry – Electronic Structure and Bonding

Guida di studio - Domande di pratica

Study guide - Flashcard