Question 1

Which statement best describes the difference between ionic and covalent bonding according to Lewis theory?

Accepted Answer

Ionic bonding involves the transfer of electrons from one atom to another, while covalent bonding involves the sharing of electrons between atoms.

Question 2

What is the electron configuration for the valence electrons of silicon (Si) as shown in the Lewis theory?

Accepted Answer

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

Question 3

Which of the following molecules contains a coordinate covalent bond?

Accepted Answer

NH$$_4^+$$

Question 4

How many lone pairs are present on the central atom in the Lewis structure of dichlorine monoxide (Cl$$_2O$$)?

Accepted Answer

2

Question 5

Which molecule has a triple covalent bond according to its Lewis structure?

Accepted Answer

N$$_2$$

Question 6

Why is O$$_2$$ paramagnetic, as observed in experiments?

Accepted Answer

Because O$$_2$$ contains unpaired electrons in its molecular orbitals.

Question 7

Which of the following best explains why N$$_2 is $$chemically inert under atmospheric conditions?

Accepted Answer

N$$_2$$ has a triple covalent bond, making it very stable and unreactive.

Question 8

Which of the following is true about the Lewis structure of water (H$$_2O$$)?

Accepted Answer

The oxygen atom has two lone pairs and forms two single bonds with hydrogen atoms.

Question 9

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

Accepted Answer

$$0$$

Question 10

Which of the following statements about resonance is correct?

Accepted Answer

Resonance structures are a way to represent delocalized electrons in a molecule, and the actual molecule is a hybrid of these structures.

Question 11

Which molecule is an example of an exception to the octet rule due to an odd number of electrons?

Accepted Answer

NO

Question 12

What is the bond order of the carbon-oxygen bonds in the carbonate ion (CO$$_3$$^{2-}$$)?

Accepted Answer

$$1.33$$

Question 13

Which of the following best describes the shape of a molecule with four electron groups around the central atom, according to VSEPR theory?

Accepted Answer

Tetrahedral

Question 14

Which factor determines whether a covalent bond is polar?

Accepted Answer

The difference in electronegativity between the two atoms.

Question 15

Which of the following molecules is expected to have a dipole moment?

Accepted Answer

H$$_2O$$

Question 16

What is the bond order of O$$_2$$ according to molecular orbital theory?

Accepted Answer

$$2$$

Question 17

Which statement about the formation of a covalent bond between two hydrogen atoms is correct?

Accepted Answer

The bond forms when two hydrogen atoms share a pair of electrons, resulting in increased electron density between the nuclei.

Question 18

Which of the following is a correct statement about lone pairs and bond pairs in Lewis structures?

Accepted Answer

Bond pairs are shared between atoms, while lone pairs remain on a single atom.

Question 19

Which molecule is expected to have the shortest bond length?

Accepted Answer

N$$_2 ($$triple bond)

Question 20

Which of the following is NOT a valid guideline for assigning formal charges in Lewis structures?

Accepted Answer

Structures with adjacent atoms having the same formal charge are preferred.

Chemische Binding: Lewis Theorie en Covalente Bindingen

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