Bonding Practice Quiz #2

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

• decreasing repulsion between hydrogen atoms

Which of the following complete Lewis diagrams represents a molecule containing a bond

angle that is closest to 120^o?

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Contains 1 sigma (σ) and 2 pi (π) bonds

• Li₂

• B₂

• N₂

• O₂

• F₂

For which of the following molecules are resonance structures necessary to describe the bonding satisfactorily?

• H₂S

• SO₂

• CO₂

• OF₂

• PF₃

Has a trigonal-pyramidal molecular geometry

• H₂O

• NH₃

• BH₃

• CH₄

• SiH₄

Is predicted to have the largest bond angle

• H₂O

• NH₃

• BH₃

• CH₄

• SiH₄

Has molecules with a pyramidal shape

• NH₃

• BH₃

• H₂

• H₂S

• HBr

Lewis electron-dot diagrams for CO₂ and SO₂ are given above. The molecular geometry and polarity of the two substances are

• the same because the molecular formulas are similar

• the same because C and S have similar electronegativity values

• different because the lone pair of electrons on the S atom make it the negative end of a dipole

• different because S has a greater number of electron domains (regions of electron density) surrounding it than C has

In the following diagrams, elements are represented by X and Z, which form molecular compounds with one another. Which diagram represents a molecule that has a bent molecular geometry?

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Pi (π) bonding occurs in each of the following species EXCEPT

• CO₂

• C₂H₄

• CN^-

• C₆H₆

• CH₄

Tags

NGSS.HS-PS1-1