Ionic Bonding and Ionic Compounds HW

Reading Check Explain what a formula unit is.

• The smallest number of atoms that forms a compound with zero net charge.

• A single molecule made of covalently bonded atoms.

• Any group of atoms that has a net positive charge.

• The mass of one mole of an ionic compound.

Identify The equation below represents the formation of the formula unit CaF2. Label the equation with the name of each particle shown: .Ca• + :F: + :F: → Ca2+ + :F:− + :F:−

• Fluoride anion

• .Ca•

• Calcium atom

• :F:

• Fluorine atom

• Ca2+

• Calcium cation

• :F:−

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

How do solid crystal ionic compounds minimize potential energy?

• By forming an orderly crystal lattice that balances cation–anion attractions with repulsive forces.

• By creating isolated molecules held together by covalent bonds.

• By maximizing repulsive forces between like-charged ions without attractions.

• By arranging ions randomly so forces cancel on average.

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NGSS.HS-PS2-4

Energy is ______ when an ionic compound forms because the potential energy of the particles ______.

• released; decreases

• absorbed; increases

• released; increases

• absorbed; decreases

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NGSS.HS-PS1-4

The attractive force between formula units in an ionic compound is ______ than the attractive force between molecules in a covalent compound.

• stronger

• weaker

• the same

• unrelated

Distinguish between ionic and molecular compounds in terms of the basic units that each is composed of.

• Ionic compounds are composed of formula units made of cations and anions; molecular compounds are composed of molecules of covalently bonded atoms.

• Ionic compounds are composed of neutral molecules; molecular compounds are composed of ions.

• Both ionic and molecular compounds are composed of identical molecules.

• Ionic compounds and molecular compounds are both composed of individual atoms rather than groups.

Review Which two of the following are ionic compounds? Select two.

• NaCl

• CaF2

• CO2

• CH4

Tags

NGSS.HS-PS1-3

Use electron-dot notation to demonstrate the formation of ionic compounds involving Li and Cl. What is the resulting chemical formula?

• LiCl

• LiCl₂

• Li₂Cl

• Li₂Cl₂

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Use electron-dot notation to demonstrate the formation of ionic compounds involving Ca and I. What is the resulting chemical formula?

• CaI

• CaI₂

• Ca₂I

• Ca₂I₂

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Compound B has lower melting and boiling points than compound A. At the same temperature, compound B vaporizes faster than compound A. One of these compounds is ionic and the other is molecular. Which compound would you expect to be molecular?

• Compound A

• Compound B

Tags

NGSS.HS-PS1-1