Question 1

Which of the following statements best describes the formation of an ionic bond between sodium (Na) and chlorine (Cl)?

Accepted Answer

Sodium transfers one electron to chlorine, resulting in oppositely charged ions that attract each other.

Question 2

Which of the following elements is most likely to form a $$2^+$$ ion based on its position in the periodic table?

Accepted Answer

Calcium (Ca)

Question 3

What is the correct formula for the ionic compound formed between magnesium ions and nitrate ions?

Accepted Answer

$$\mathrm{Mg(NO_3$)_2}$$

Question 4

Which of the following is the correct name for the compound $$\mathrm{Na_2SO_4}$$?

Accepted Answer

Sodium sulfate

Question 5

Which of the following compounds contains a polyatomic ion?

Accepted Answer

$$\mathrm{$$CaCO_3$$}$$

Question 6

Which of the following statements correctly compares ionic and covalent compounds?

Accepted Answer

Ionic compounds are usually solid at room temperature and have high melting points.

Question 7

Which of the following best describes the trend of electronegativity in the periodic table?

Accepted Answer

Electronegativity increases from left to right across a period and decreases down a group.

Question 8

Given the electronegativities: H (2.1), Cl (3.0), and Na (0.9), which bond is most polar?

Accepted Answer

Na–Cl

Question 9

How many covalent bonds will a nitrogen atom typically form to satisfy the octet rule?

Accepted Answer

Three

Question 10

Which of the following Lewis structures correctly represents carbon dioxide ($$\mathrm{CO_2$}$$)?

Accepted Answer

O=C=O, with each O atom having two lone pairs

Question 11

Which molecular geometry is predicted by VSEPR theory for ammonia ($$\mathrm{NH_3$}$$)?

Accepted Answer

Trigonal pyramidal

Question 12

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

Accepted Answer

$$\mathrm{CO_2$}$$

Question 13

What is the correct name for the binary molecular compound $$\mathrm{N_2O_4}$$?

Accepted Answer

Dinitrogen tetroxide

Question 14

Which of the following formulas represents the compound formed between aluminum ions and phosphate ions?

Accepted Answer

$$\mathrm{$$AlPO_4$$}$$

Question 15

A patient is given a medication containing ammonium sulfate. Which ions are present in this compound?

Accepted Answer

Ammonium and sulfate

Question 16

Which of the following best explains why water ($$\mathrm{H_2O}) is a $$polar molecule?

Accepted Answer

It has polar bonds and a bent molecular geometry.

Question 17

Which of the following is the correct Lewis structure for the nitrate ion ($$\mathrm{NO_3$^-}$$)?

Accepted Answer

A central N atom with one double bond to O and two single bonds to O, each O with lone pairs, and a negative charge delocalized over the O atoms.

Question 18

Which of the following compounds is most likely to conduct electricity when dissolved in water?

Accepted Answer

$$\mathrm{NaCl}$$

Question 19

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

Accepted Answer

A double covalent bond between two O atoms

Question 20

Which of the following is the correct formula for diphosphorus pentasulfide?

Accepted Answer

$$\mathrm{P_2S_5}$$

Ionic and Molecular Compounds: Formation, Properties, and Bonding

Study Guide - Practice Questions