Question 1

Which of the following best describes the difference between an ionic bond and a covalent bond?

Accepted Answer

An ionic bond involves the transfer of electrons from a metal to a nonmetal, while a covalent bond involves the sharing of electrons between two nonmetals.

Question 2

Which of the following ions is formed when a magnesium atom loses two electrons?

Accepted Answer

$$\mathrm{Mg}^{2+}$$

Question 3

What is the correct formula for the ionic compound formed between aluminum and oxygen?

Accepted Answer

$$\mathrm{Al}_2\mathrm{O}_3$$

Question 4

Which of the following statements about polyatomic ions is TRUE?

Accepted Answer

Polyatomic ions consist of covalently bonded atoms that act as a single charged unit.

Question 5

What is the name of the compound $$\mathrm{FeCl}_3$$?

Accepted Answer

Iron(III) chloride

Question 6

Which of the following best explains why sodium forms a $$+1$$ ion?

Accepted Answer

Sodium loses one electron to achieve a noble gas configuration.

Question 7

What is the correct formula for ammonium sulfate?

Accepted Answer

$$\mathrm{(NH}_4)_2\mathrm{SO}_4$$

Question 8

Which of the following molecules is a diatomic molecule found naturally in elemental form?

Accepted Answer

$$\mathrm{O}_2$$

Question 9

A molecule of carbon dioxide ($$\mathrm{CO}_2) $$contains:

Accepted Answer

Two double bonds between carbon and oxygen atoms

Question 10

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond in which electrons are shared unequally between two atoms

Question 11

What is the correct name for $$\mathrm{N}_2\mathrm{O}_5$$?

Accepted Answer

Dinitrogen pentoxide

Question 12

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

Accepted Answer

$$\mathrm{NaNO}_3$$

Question 13

Which of the following is the correct Lewis structure for $$\mathrm{H}_2$$?

Accepted Answer

H -- H

Question 14

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

Accepted Answer

Electronegativity increases from left to right.

Question 15

What is the correct formula for the compound formed between calcium ions and phosphate ions?

Accepted Answer

$$\mathrm{Ca}_3(\mathrm{PO}_4)_2$$

Question 16

Which of the following is the correct name for $$\mathrm{SO}_3$$?

Accepted Answer

Sulfur trioxide

Question 17

A student draws the Lewis structure for $$\mathrm{NH}_3 ($$ammonia). How many lone pairs are on the central atom?

Accepted Answer

1

Question 18

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

Accepted Answer

They are composed of ions held together by strong electrostatic attractions.

Question 19

Which of the following is the correct formula for iron(III) sulfate?

Accepted Answer

$$\mathrm{Fe}_2(\mathrm{SO}_4)_3$$

Question 20

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

Accepted Answer

Hydrogen and boron are exceptions to the octet rule.

Ch 6 - Ionic and Molecular Compounds: Structure, Naming, and Properties

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