Question 1

Which group and valence electron configuration does the Lewis electron-dot symbol for sulfur (shown in the first image) represent?

Accepted Answer

Group 6A, $$(2s)^2$$ $$(2p)^4$$

Question 2

Which Lewis structure (second image) correctly represents nitrogen trichloride, $$\mathrm{$$NCl_3$$}$$?

Accepted Answer

The first structure (N single bonded to three Cl atoms, with a lone pair on N)

Question 3

The molecular model in the third image represents which molecular geometry?

Accepted Answer

Tetrahedral

Question 4

The molecular model in the fourth image represents which molecular geometry?

Accepted Answer

Trigonal bipyramidal

Question 5

The molecular model in the fifth image represents which molecular geometry?

Accepted Answer

Trigonal pyramidal

Question 6

The molecular model in the sixth image represents which molecular geometry?

Accepted Answer

Bent

Question 7

Refer to the glycine Lewis structure (seventh image). What are the ideal bond angles for Angle 1 (H-N-H), Angle 2 (C-C-O), and Angle 3 (O-C-O)?

Accepted Answer

Angle 1: $$109.5^\circ$$, Angle 2: $$120^\circ$$, Angle 3: $$109.5^\circ$$

Question 8

Using the periodic table (eighth image), which element has the highest electronegativity?

Accepted Answer

Fluorine

Question 9

Based on the periodic table (eighth image), which of the following elements is most likely to form a $$2+$$ cation?

Accepted Answer

Calcium

Question 10

Which equation from the equation sheet (ninth image) would you use to calculate the work done by a gas during expansion at constant pressure?

Accepted Answer

$$w = -P \Delta V$$

Question 11

Which equation from the equation sheet (tenth image) would you use to calculate the energy of a photon?

Accepted Answer

$$E = h 
u$$

Question 12

Which of the following best describes the bond order and polarity of the $$\mathrm{N_2$}$$ molecule?

Accepted Answer

Bond order 3, nonpolar

Question 13

Which of the following statements about $$\pi$$ bonds is true?

Accepted Answer

A $$\pi$$ bond has zero electron density (a node) along the internuclear axis.

Question 14

Which of the following molecules has the greatest dipole moment?

Accepted Answer

$$\mathrm{NaCl}$$

Question 15

Which hybridization is associated with a tetrahedral electron geometry?

Accepted Answer

$$sp^3$$

Question 16

Which of the following best describes the orbitals involved in the $$\sigma$$ and $$\pi$$ bonds of acetylene ($$\mathrm{C_2H_2}$$)?

Accepted Answer

$$\sigma$$ bonds: sp, $$\pi$$ bonds: p

Question 17

Which of the following statements about hybrid orbitals is correct according to valence bond theory?

Accepted Answer

Combining 1 s orbital and 3 p orbitals yields 4 hybrid orbitals.

Study Guidance for Chemical Bonding, Molecular Shapes, and Lewis Structures

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