Extra Questions (Unit 2, 3, 5)

On the basis of the information above, which of the following arranges the binary compounds in order of increasing bond polarity?

• CH₄ < SiCl₄ < SF₄

• CH₄ < SF₄ < SiCl₄

• SF₄ < CH₄ < SiCl₄

• SiCl₄ < SF₄ < CH₄

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following correctly indicates whether the solid represented by the particulate model shown above conducts electricity and explains why or why not?

• It conducts electricity because it is made of positive and negative ions.

• It conducts electricity because it is made of particles of different sizes.

• It does not conduct electricity because its ions cannot move freely within the solid.

• It does not conduct electricity because there are small spaces between the particles.

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NGSS.HS-PS1-3

NGSS.HS-PS2-6

Based on the data in the tables above, which of the following statements provides the best prediction for the boiling point of NaCl?

• NaCl will have a lower boiling point than NaF because the coulombic attractions are weaker in NaCl than in NaF.

• NaCl will have a boiling point between that of NaF and MgO because the covalent character of the bonds in NaCl is intermediate between that of MgO and NaF.

• NaCl will have a higher boiling point than MgO because the ions are spaced farther apart in NaCl.

• NaCl will have a higher boiling point than MgO because the energy required to transfer electrons from the anion to the cation is larger in NaCl than in MgO.

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NGSS.HS-PS2-4

The geometry of the SO₃ molecule is best described as

• trigonal planar

• trigonal pyramidal

• bent

• tetrahedral

Which of the following compounds contains both ionic and covalent bonds?

• C₂H₅OH

• MgF₂

• H₂S

• NH₄Cl

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NGSS.HS-PS1-3

Which of the following scientific claims about the bond in the molecular compound HF is most likely to be true?

• There is a partial negative charge on the H atom.

• Electrons are shared equally between the H and F atoms.

• The bond is extremely weak.

• The bond is highly polar.

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NGSS.HS-PS1-1

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.

The structural formula of the glycinium cation is shown above. Arrows indicate the pKₐ values for the labile protons in the molecule. What is the approximate H — O — C bond angle in the glycinium cation?

• 180°

• 120°

• 105°

• 90°

Which of the following can be inferred from the diagram above that shows the dependence of potential energy on the internuclear distance between two atoms?

• The atoms form a bond with a bond length of 25 pm.

• The atoms form a bond with a bond length of 75 pm.

• The net force between the atoms is attractive at 25 pm.

• The net force between the atoms is attractive at 75 pm.

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NGSS.HS-PS1-3

NGSS.HS-PS1-4

NGSS.HS-PS2-4

Which of the following Lewis electron-dot diagrams represents the molecule that contains the smallest bond angle?

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