Question 1

Which of the following best describes an ionic compound?

Accepted Answer

A compound formed by the transfer of electrons from a metal to a nonmetal, resulting in electrostatic attraction between ions.

Question 2

Which of the following is the correct empirical formula for a compound formed from Al³⁺ and O²⁻ ions?

Accepted Answer

$$\mathrm{Al_2O_3}$$

Question 3

Which of the following statements about covalent (molecular) compounds is TRUE?

Accepted Answer

They are formed by the sharing of electrons between nonmetals.

Question 4

What is the correct name for the compound $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 5

Which of the following best explains why solid NaCl does NOT conduct electricity, but molten NaCl does?

Accepted Answer

In the solid state, the ions are fixed in a lattice and cannot move, but in the molten state, the ions are free to move and carry charge.

Question 6

Which of the following is the correct Lewis structure for the carbonate ion, $$\mathrm{CO_3$^{2-}}$$?

Accepted Answer

Three equivalent resonance structures, each with one C=O double bond and two C–O single bonds, with the negative charge delocalized over the three oxygens.

Question 7

Which of the following pairs of elements is most likely to form a polar covalent bond?

Accepted Answer

H and F

Question 8

What is the formal charge on the nitrogen atom in the Lewis structure of the nitrate ion, $$\mathrm{NO_3$^-}$$, where nitrogen forms one double bond and two single bonds to oxygen atoms?

Accepted Answer

$$+1$$

Question 9

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

Accepted Answer

Dinitrogen pentoxide

Question 10

Which of the following compounds contains both ionic and covalent bonds?

Accepted Answer

$$\mathrm{NH_4NO_3}$$

Question 11

Which of the following best describes a resonance structure?

Accepted Answer

One of two or more valid Lewis structures for a molecule that differ only in the placement of electrons.

Question 12

Which of the following is the correct formula for calcium phosphate?

Accepted Answer

$$\mathrm{Ca_3$(PO_4$)_2}$$

Question 13

Which of the following is the correct name for $$\mathrm{H_2SO_4}$$?

Accepted Answer

Sulfuric acid

Question 14

Which of the following statements about the octet rule is FALSE?

Accepted Answer

All elements must always have exactly eight electrons in their valence shell.

Question 15

Which of the following is the correct name for $$\mathrm{Cu(NO_3$)_2}$$?

Accepted Answer

Copper(II) nitrate

Question 16

Which of the following best explains why graphite and diamond, both made of carbon, have different properties?

Accepted Answer

They have different types of chemical bonds and structures.

Question 17

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

Accepted Answer

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

Question 18

Which of the following is the correct name for $$\mathrm{P_2O_3}$$?

Accepted Answer

Diphosphorus trioxide

Question 19

Which of the following best describes the bonding in $$\mathrm{Na_2SO_4}$$?

Accepted Answer

Both ionic and covalent bonds are present.

Question 20

Which of the following is the correct Lewis structure for $$\mathrm{O_2$}$$?

Accepted Answer

A double bond between the two oxygen atoms, each with two lone pairs.

Chapter 4: Basic Chemical Bonding – Elements, Compounds, and Molecular Structure

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