Unit 5 Post-Assessment Remediation (PAR)

What occurs in order to break the bond in a Cl₂ molecule?

• Energy is absorbed.

• Energy is released.

• The molecule creates energy.

• The molecule destroys energy.

Tags

NGSS.HS-PS1-4

The chemical bonding in sodium phosphate, Na₃PO₄, is classified as:

• ionic, only

• metallic, only

• both covalent and ionic

• both covalent and metallic

The bonds in BaO are best described as

• covalent, because valence electrons are shared

• covalent, because valence electrons are transferred

• ionic, because valence electrons are shared

• ionic, because valence electrons are transferred

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

As a bond between a hydrogen atom and a sulfur atom is formed, electrons are

• shared to form an ionic bond

• shared to form a covalent bond

• transferred to form an ionic bond

• transferred to form a covalent bond

A chemist performs the same tests on two homogeneous white crystalline solids, A and B. The results are shown in the table. The results of these tests suggest that

• both solids contain only ionic bonds

• both solids contain only covalent bonds

• solid A contains only covalent bonds and solid B contains only ionic bonds

• solid A contains only ionic bonds and solid B contains only covalent bonds

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-3

Which Lewis electron-dot diagram represents a molecule of H₂S?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

Which Lewis electron-dot diagram represents a molecule having a nonpolar covalent bond?

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-2

Which Lewis electron-dot diagram represents calcium oxide?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

Which phrase describes the molecular polarity of and the charge distribution in an HCl molecule?

• nonpolar with an asymmetrical charge distribution

• nonpolar with a symmetrical charge distribution

• polar with an asymmetrical charge distribution

• polar with a symmetrical charge distribution

Which statement describes the charge distribution and the polarity of a CH₄ molecule?

• The charge distribution is symmetrical and the molecule is nonpolar.

• The charge distribution is asymmetrical and the molecule is nonpolar.

• The charge distribution is symmetrical and the molecule is polar.

• The charge distribution is asymmetrical and the molecule is polar.