U2: Ionic, Covalent, and Metallic Bonds: Mastery Test

Which statement best describes the properties of ionic compounds?

• They are good conductors of heat and electricity and are ductile and malleable.

• They are always composed of an equal proportion of cations to anions.

• They mostly have low melting and boiling points.

• They are brittle, solid at room temperature, and have a high melting point.

How are ions formed?

• by the disintegration of one or more electrons

• by the sharing of one or more electrons between two atoms

• by the transfer of one or more electrons from one atom to another

• by the disintegration of one or more protons

Tags

NGSS.MS-PS1-5

Select the correct answer. Which is the reason that ionic compounds are brittle?

• The bonds between the anions and cations are weak and therefore easily broken.

• A strong repulsive force is created when cations suddenly align.

• They involve positive metal ions in a sea of delocalized electrons.

• They share electrons, which makes the bond brittle.

Tags

NGSS.HS-PS1-3

Select the correct answer. How does an atom become a positively charged ion?

• by gaining one or more electrons

• by gaining one or more neutrons

• by losing one or more neutrons

• by losing one or more electrons

Select the correct answer. Which statement is true regarding the formation of ionic bonds?

• Anions and cations share electrons.

• Atoms transfer electrons to form cations and anions.

• Ions transfer electrons to form cations and anions.

• Anions and cations donate electrons.

Tags

NGSS.MS-PS1-5

Select the correct answer. Which statement best explains the octet rule?

• Atoms gain, lose, or share electrons to achieve a full valence shell.

• Compounds always consist of eight electrons.

• Molecules always consist of eight atoms.

• All atoms require eight electrons to form bonds.

Select the correct answer. What are ionic compounds typically composed of?

• a metal anion and a nonmetal cation

• two metal anions

• a metal cation and a nonmetal anion

• two nonmetal cations

Select the correct answer. What is the crystalline arrangement of atoms shown here?

• face-centered cubic arrangement

• body-centered cubic arrangement

• hexagonal close-packed arrangement

• cubic close-packed arrangement

Tags

NGSS.MS-PS3-2

Select the correct answer. The hypothetical elements shown here do not include hydrogen or helium. Which element would you expect to bond covalently with an oxygen atom to form a two-atom molecule?

• figure a

• figure b

• figure c

• figure d

Tags

NGSS.MS-PS1-1

Select the correct answer. According to the Lewis dot structure shown here, how many valence electrons does chlorine have?

• 4

• 6

• 7

• 8