Question 1

Which of the following best describes the process by which sodium and chlorine form an ionic bond in sodium chloride (NaCl)?

Accepted Answer

Sodium loses an electron to chlorine, forming Na+ and Cl– ions that are held together by electrostatic attraction.

Question 2

Which of the following compounds has the highest lattice energy based on the charges and sizes of the ions involved?

Accepted Answer

$$\mathrm{MgO}$$

Question 3

Which of the following statements about lattice energy is correct?

Accepted Answer

Lattice energy increases as the magnitude of the ionic charges increases.

Question 4

Which of the following ions is isoelectronic with neon ($$\mathrm{Ne}$$)?

Accepted Answer

$$\mathrm{Na^+}$$

Question 5

Which of the following bonds is considered nonpolar covalent based on the electronegativity difference?

Accepted Answer

The bond in $$\mathrm{C_2H_4} (C=C)$$

Question 6

Which of the following molecules is polar, even though all its bonds are polar?

Accepted Answer

$$\mathrm{H_2O}$$

Question 7

What is the correct formula for aluminum oxide?

Accepted Answer

$$\mathrm{Al_2O_3}$$

Question 8

Which of the following best describes the geometry and bond angle of methane ($$\mathrm{CH_4$}) $$according to VSEPR theory?

Accepted Answer

Tetrahedral, $$109.5^\circ$$

Question 9

Which of the following is the correct name for $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 10

Which of the following molecules has a square planar molecular geometry?

Accepted Answer

$$\mathrm{$$ICl_4$$^-}$$

Question 11

Which of the following compounds is a hydrate?

Accepted Answer

$$\mathrm{$$CuCl_2$$ \cdot 2H_2O}$$

Question 12

Which of the following is the strongest type of intermolecular force present in water ($$\mathrm{H_2O}$$)?

Accepted Answer

Hydrogen bonding

Question 13

Which of the following molecules is nonpolar, despite having polar bonds?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 14

Which of the following is the correct Lewis dot symbol for a sulfide ion ($$\mathrm{S$$^{2-}$$}$$)?

Accepted Answer

S with 8 dots and a $$2-$$ charge

Question 15

Which of the following best explains why $$\mathrm{MgO}$$ has a much higher melting point than $$\mathrm{NaCl}$$?

Accepted Answer

$$\mathrm{MgO}$$ has a larger lattice energy due to higher ionic charges.

Question 16

Which of the following is the correct formula for ammonium sulfate?

Accepted Answer

$$\mathrm{(NH_4$)_2SO_4}$$

Question 17

Which of the following molecules has a trigonal bipyramidal electron-domain geometry?

Accepted Answer

$$\mathrm{$$PCl_5$$}$$

Question 18

Which of the following best describes the bond in hydrogen fluoride ($$\mathrm{HF}$$)?

Accepted Answer

Polar covalent

Question 19

Which of the following is the correct name for $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

Question 20

Which of the following trends is correct regarding intermolecular forces and boiling points?

Accepted Answer

Stronger intermolecular forces result in higher boiling points.

Chemical Bonding and Molecular Geometry: Ionic and Covalent Bonds, Lewis Structures, and Molecular Shape

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