Question 1

Which of the following best describes the difference between ionic and covalent compounds?

Accepted Answer

Ionic compounds are formed by transferring electrons from a metal to a nonmetal, while covalent compounds are formed by sharing electrons between two nonmetals.

Question 2

What is the correct name for the compound $$\mathrm{Cr_2$(SO_4$)_3}$$?

Accepted Answer

Chromium (III) Sulfate

Question 3

Which of the following is the correct empirical formula for a compound with the molecular formula $$\mathrm{C_6H_{12}O_6$}$$?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 4

Given the Lewis structure for $$\mathrm{NO_2$^-}$$, what is the bond order between nitrogen and oxygen?

Accepted Answer

$$1.5$$

Question 5

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

Accepted Answer

$$\mathrm{CO_2$}$$

Question 6

What is the formal charge on the oxygen atom in $$\mathrm{ClO^-}$$?

Accepted Answer

$$-1$$

Question 7

Which of the following best describes the hybridization of the central atom in $$\mathrm{NH_3$}$$?

Accepted Answer

$$sp^3$$

Question 8

How many sigma ($$\sigma) $$and pi ($$\pi) $$bonds are present in a molecule of $$\mathrm{CO_2$}$$?

Accepted Answer

2 $$\sigma$$ and 2 $$\pi$$

Question 9

Which of the following statements about resonance structures is TRUE?

Accepted Answer

The actual structure of a molecule is a hybrid of all resonance structures.

Question 10

A molecule has a trigonal planar electron geometry and one lone pair on the central atom. What is its molecular geometry?

Accepted Answer

Bent

Question 11

Which of the following compounds contains a polyatomic ion?

Accepted Answer

$$\mathrm{NH_4Cl}$$

Question 12

What is the correct name for $$\mathrm{$$POCl_3$$}$$?

Accepted Answer

Phosphorus Oxygen Trichloride

Question 13

Which of the following best describes the bond between Sr and O in $$\mathrm{SrO}$$?

Accepted Answer

Ionic

Question 14

Given the molecular orbital diagram for $$\mathrm{F_2$}$$, what is the bond order?

Accepted Answer

$$1$$

Question 15

Which of the following molecules is expected to be diamagnetic?

Accepted Answer

$$\mathrm{F_2$}$$

Question 16

A molecule has the formula $$\mathrm{SF_6$}. $$What is its electron geometry and molecular geometry?

Accepted Answer

Octahedral, Octahedral

Question 17

Which of the following best explains why $$\mathrm{H_2O} is $$polar while $$\mathrm{CO_2$} is $$nonpolar?

Accepted Answer

$$\mathrm{H_2O}$$ has polar bonds and a bent shape, while $$\mathrm{CO_2$}$$ has polar bonds and a linear shape that cancels dipoles.

Question 18

Which of the following is the correct electron configuration for the $$\mathrm{O_2$}$$ molecule using molecular orbital theory?

Accepted Answer

$$\sigma_{2s}^2\ \sigma_{2s}^{*2}\ \pi_{2p_x}^2\ \pi_{2p_y}^2\ \sigma_{2p_z}^2\ \pi_{2p_x}^{*1}\ \pi_{2p_y}^{*1}$$

Question 19

Which of the following best describes the process of determining the formal charge on an atom in a Lewis structure?

Accepted Answer

Formal charge = number of valence electrons - (number of lone pair electrons + 1/2 number of bonding electrons)

Question 20

Which of the following molecules has a central atom with an expanded octet?

Accepted Answer

$$\mathrm{SF_6$}$$

Exam 2 Review: Compounds, Lewis Structures, VSEPR, and Bonding (CHEM 1210)

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