Question 1

Which of the following best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons from a metal to a nonmetal, while covalent bonds involve the sharing of electrons between two nonmetals.

Question 2

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

Accepted Answer

$$\mathrm{Al_2O_3}$$

Question 3

Which of the following ions is most likely to be formed by a Group 2A element?

Accepted Answer

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

Question 4

A sample of hydroxyapatite, $$\mathrm{Ca_5$(PO_4$)_3(OH)}$$, is analyzed. How many moles of calcium ions are present in one mole of hydroxyapatite?

Accepted Answer

5 moles

Question 5

Which of the following best explains why sodium forms a $$\mathrm{Na^+}$$ ion and chlorine forms a $$\mathrm{Cl^-}$$ ion in sodium chloride?

Accepted Answer

Sodium loses one electron to achieve the electron configuration of the previous noble gas, while chlorine gains one electron to achieve the configuration of the next noble gas.

Question 6

Which of the following compounds contains a polyatomic ion?

Accepted Answer

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

Question 7

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

Accepted Answer

Iron(III) chloride

Question 8

Which of the following bonds is most polar based on electronegativity differences?

Accepted Answer

$$\mathrm{H-F}$$

Question 9

A Lewis structure for $$\mathrm{O_2$}$$ shows a double bond between the two oxygen atoms. What does this indicate about the sharing of electrons?

Accepted Answer

Each oxygen atom shares two pairs of electrons.

Question 10

Which of the following best describes the environmental significance of adding crushed rock to farmland, as discussed in recent studies?

Accepted Answer

It removes atmospheric carbon dioxide by enhancing weathering reactions in soil.

Question 11

Which of the following is the correct formula for calcium chloride, a compound used for de-icing roads?

Accepted Answer

$$\mathrm{$$CaCl_2$$}$$

Question 12

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity is a measure of an atom’s attraction for electrons in a bond.

Question 13

Which of the following ions is a polyatomic ion?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 14

A compound contains the ammonium ion and the sulfate ion. What is its correct chemical formula?

Accepted Answer

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

Question 15

Which of the following best describes why transition metals often require Roman numerals in their compound names?

Accepted Answer

They can form more than one possible positive ion (cation) with different charges.

Question 16

Which of the following is the correct name for $$\mathrm{K_2O}$$?

Accepted Answer

Potassium oxide

Question 17

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond in which electrons are shared unequally, resulting in partial charges on the atoms.

Question 18

Which of the following is the correct formula for the compound formed between magnesium and nitrate ions?

Accepted Answer

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

Question 19

Which of the following best explains why carbon is considered the building block of life?

Accepted Answer

Carbon can form four covalent bonds, allowing for a diversity of stable organic molecules.

Question 20

A Lewis structure for $$\mathrm{Cl_2$}$$ shows each chlorine atom with three lone pairs and one bonding pair. What does this indicate?

Accepted Answer

Each chlorine atom shares one pair of electrons and has three nonbonding pairs.

2) Chemical Bonding: Ionic and Covalent Bonds, Electronegativity, and Polyatomic Ions

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