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Molecular & Ionic Compound Structure/Properties

Authored by Dana Shull

Chemistry

11th - 12th Grade

Used 56+ times

Molecular & Ionic Compound Structure/Properties
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42 questions

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1.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

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The BF₃ molecule is nonpolar, whereas the NF₃ molecule is polar. Which of the following statements accounts for the difference in polarity of the two molecules?

In NF₃, each F is joined to N with multiple bonds, whereas in BF₃ , each F is joined to B with single bonds.

N — F bonds are polar, whereas B — F bonds are nonpolar.

NF₃ is an ionic compound, whereas BF₃ is a molecular compound.

Unlike BF₃, NF₃ has a nonplanar geometry due to an unshared pair of electrons on the N atom.

2.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which of the following is a nonpolar molecule that contains polar bonds?

F₂

CHF₃

CO₂

HCl (hydrogen chloride)

NH₃

3.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The electron-dot structure (Lewis structure) for which of the following molecules would have two unshared pairs of electrons on the central atom?

H₂S

NH₃

CH₄

HCN

CO₂

4.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

According to the VSEPR model, the progressive decrease in the bond angles in the series of molecules CH₄, NH₃, and H₂O is best accounted for by the:

increasing strength of the bonds.

decreasing size of the central atom.

increasing electronegativity of the central atom.

increasing number of unshared pairs of electrons.

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Steel is an alloy containing Fe atoms and C atoms. Which of the following diagrams best represents the particle-level structure of steel?

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6.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which of the following molecules has the shortest bond length?

N₂

O₂

Cl₂

Br₂

I₂

7.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which of the following diagrams best depicts an alloy of Ni and B?

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