Question 1

Which of the following best explains why noble gases such as neon and argon do not readily form compounds with other elements?

Accepted Answer

They have a full outer shell of 8 valence electrons, making them chemically stable.

Question 2

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

Accepted Answer

$$\mathrm{MgO}$$

Question 3

Which property is NOT characteristic of ionic compounds?

Accepted Answer

They are usually gases at room temperature.

Question 4

When sodium reacts with chlorine to form sodium chloride, what happens to the electrons?

Accepted Answer

Sodium loses one electron and chlorine gains one electron.

Question 5

Which of the following ions has the same number of electrons as neon?

Accepted Answer

$$\mathrm{Na^+}$$

Question 6

What is the correct name for the compound $$\mathrm{$$CaCl_2$$}$$?

Accepted Answer

Calcium chloride

Question 7

Which of the following best describes the structure of an ionic solid such as sodium chloride?

Accepted Answer

A repeating lattice of positive and negative ions held together by electrostatic forces.

Question 8

What is the charge on the phosphate ion in the compound $$\mathrm{Ca_3$(PO_4$)_2}$$?

Accepted Answer

$$3-$$

Question 9

Which of the following is a polyatomic cation?

Accepted Answer

Ammonium ($$\mathrm{NH_4$^+})$$

Question 10

A student mixes potassium and bromine. What is the formula of the resulting ionic compound?

Accepted Answer

$$\mathrm{KBr}$$

Question 11

Which of the following best describes the octet rule?

Accepted Answer

Atoms tend to gain, lose, or share electrons to achieve 8 electrons in their outer shell.

Question 12

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

Accepted Answer

Iron(III) chloride

Question 13

Which of the following compounds contains a covalent bond?

Accepted Answer

$$\mathrm{H_2O}$$

Question 14

What is the molecular geometry of $$\mathrm{CH_4$} ($$methane)?

Accepted Answer

Tetrahedral

Question 15

Which of the following molecules is nonpolar?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 16

A compound is formed between calcium and phosphorus. What is its formula?

Accepted Answer

$$\mathrm{Ca_3P_2}$$

Question 17

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond in which electrons are shared unequally between two atoms.

Question 18

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

Accepted Answer

Dinitrogen tetroxide

Question 19

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

Accepted Answer

A Cl atom surrounded by 8 dots (electrons) and a negative charge.

Question 20

Which of the following statements about sodium chloride ($$\mathrm{NaCl}) is $$TRUE?

Accepted Answer

It is composed of a lattice of $$\mathrm{Na^+}$$ and $$\mathrm{Cl^-}$$ ions.

Chemical Bonds and Chemical Compounds: Ionic Bonding and Properties

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