7.1-7.5 HW Check

Which compound is most likely to exist as a gas or liquid at room temperature?

• Al₄C₃

• CH₄

• BaF₂

• NaCl

Which molecule contains the carbon-carbon bond with the greatest bond dissociation energy?

• H₃C-CH₃

• H₂C=CH₂

• F₂C=CF₂

• HC≡CH

Tags

NGSS.HS-PS1-4

Halogens, with high electronegativity, would have (a)   when compared to alkali metals.

• large radii and low ionization energy.

• small radii and high ionization energy.
• small radii and low ionization energy.

• large radii and high ionization energy.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

When atoms form bonds, energy is (a)   .

• absorbed
• released
• remains constant

• fluctuates continuously

Tags

NGSS.HS-PS1-4

Which bond has the smallest bond length?

• N=N

• N−N

• N≡N

Which of the following is the best description for the bond between F and H?

• A polar covalent bond with partial positive charge on the F atom

• A polar covalent bond with partial positive charge on the H atom

• A nonpolar covalent bond

• An ionic bond

Element A has an electronegativity of 1.4 and element B has an electronegativity of 2.0. Which statement best describes the bonding in A₂B?

• The AB bond is ionic and A is the anion.

• The AB bond is ionic and A is the cation.

• The AB bond is covalent with a δ+ on A.

• The AB bond is covalent with a δ− on A.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Based upon electronegativity, which carbon-halogen molecule has the weakest bonds?

• carbon tetrachloride, CCl₄

• carbon tetrafluoride, CF₄

• carbon tetrabromide, CBr₄

• carbon tetraiodide, CI₄

Tags

NGSS.HS-PS1-1

What is the net charge of an iodine atom in the molecule I₂?

• partial positive

  (δ+)

• charge of 1-

• 0

• partial negative

  (δ−)

Tags

NGSS.HS-PS1-3

Which bond is the most polar?

• C-C

• C-N

• C-O

• C-F