Question 1

Which of the following molecules is expected to have a net dipole moment (i.e., be polar)?

Accepted Answer

Ammonia, $$\mathrm{NH_3$}$$

Question 2

Which of the following statements about bond energy and bond length is correct?

Accepted Answer

A shorter bond is generally stronger than a longer bond.

Question 3

What is the formal charge on the central atom in the Lewis structure of $$\mathrm{NO_3$^-} ($$nitrate ion)?

Accepted Answer

$$+1$$

Question 4

Which of the following molecules violates the octet rule?

Accepted Answer

Sulfur hexafluoride, $$\mathrm{SF_6$}$$

Question 5

What is the electron geometry and molecular geometry of $$\mathrm{SO_2$}$$ according to VSEPR theory?

Accepted Answer

Trigonal planar, bent

Question 6

Which of the following correctly describes the hybridization of the central atom in $$\mathrm{$$PCl_5$$}$$?

Accepted Answer

$$\mathrm{sp^3$d}$$

Question 7

Which of the following compounds contains both sigma ($$\sigma) $$and pi ($$\pi) $$bonds?

Accepted Answer

Ethylene, $$\mathrm{C_2H_4}$$

Question 8

Which of the following is the correct name for $$\mathrm{Fe_2$(SO_4$)_3}$$?

Accepted Answer

Iron(III) sulfate

Question 9

A sample of a hydrate of magnesium sulfate has a mass of $$13.52\ \mathrm{g}$$ before heating. After heating to remove all water, the mass is $$6.60\ \mathrm{g}. $$What is the formula of the hydrate?

Accepted Answer

$$\mathrm{$$MgSO_4$$ \cdot 7H_2O}$$

Question 10

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

Accepted Answer

$$\mathrm{Na^+}$$

Question 11

Which of the following best explains why ionic compounds tend to have high melting points?

Accepted Answer

They have strong electrostatic attractions between oppositely charged ions.

Question 12

What is the correct name for $$\mathrm{H_2CO_3}$$?

Accepted Answer

Carbonic acid

Question 13

Which of the following is the empirical formula for glucose ($$\mathrm{C_6H_{12}O_6$}$$)?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 14

Which of the following best describes the bonding in $$\mathrm{O_2$} ($$dioxygen)?

Accepted Answer

A double bond consisting of one $$\sigma$$ and one $$\pi$$ bond

Question 15

Which of the following is the correct Lewis dot symbol for the chloride ion ($$\mathrm{Cl^-}$$)?

Accepted Answer

A Cl atom surrounded by 8 dots and a negative sign

Question 16

Which of the following best describes the lattice energy of an ionic compound?

Accepted Answer

The energy required to convert one mole of a solid ionic compound into its gaseous ions

Question 17

Which of the following correctly names $$\mathrm{NH_4NO_3}$$?

Accepted Answer

Ammonium nitrate

Question 18

A molecule has a central atom with two bonding pairs and two lone pairs. What is its molecular geometry and approximate bond angle?

Accepted Answer

Bent, $$104.5^\circ$$

Question 19

Which of the following is the correct name for $$\mathrm{$$CuSO_4$$ \cdot 5H_2O}$$?

Accepted Answer

Copper(II) sulfate pentahydrate

Question 20

Which of the following best explains why $$\mathrm{CO_2$} is a $$nonpolar molecule even though it contains polar bonds?

Accepted Answer

The molecule is linear and the bond dipoles cancel each other.

Chemical Bonding, Molecular Structure, and Nomenclature: Study Guide for CHEM 1411 Exam 2 (Chapters 4-6)

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