Q: Given the dipole moment ($$\mu) of HI is$$ $$0.44 D $$and the bond length ($$r) is$$ $$1.61$$ Å, what is the magnitude of the partial charge ($$Q) in $$coulombs? Use $$1 D$$ $$= 3.336 \times 10$$^{-30}$$ C·m and 1$ Å = 1$$ \times $$10^{-10} m.$$

$$Q = \frac{0.44 \times 3.336 \times 10$$^{-30}$$}{1.61 \times 10$$^{-10}$$} = 9.118 \times 10$$^{-21}$$ C

Question 1

Which statement best describes the concept of resonance in the ozone (O$$_3) $$molecule?

Accepted Answer

Resonance means that the actual structure is a hybrid of multiple possible Lewis structures, resulting in equal bond lengths.

Question 2

According to the VSEPR model, which of the following molecules has a trigonal planar molecular geometry?

Accepted Answer

BF$$_3$$

Question 3

What is the predicted bond angle in a molecule with four electron groups around the central atom and no lone pairs, such as CH$$_4$$?

Accepted Answer

$$109.5^\circ$$

Question 4

Which of the following best explains why the bond angle in H$$_2O is $$less than the ideal tetrahedral angle?

Accepted Answer

The presence of two lone pairs on oxygen increases repulsion, pushing the hydrogen atoms closer together.

Question 5

Which molecule is predicted to be nonpolar despite having polar bonds?

Accepted Answer

CO$$_2$$

Question 6

Given the dipole moment ($$\mu) of HI is$$ $$0.44 D $$and the bond length ($$r) is$$ $$1.61$$ Å, what is the magnitude of the partial charge ($$Q) in $$coulombs? Use $$1 D$$ $$= 3.336 	imes 10$$^{-30}$$ C·m and 1$ Å = 1$$ 	imes $$10^{-10} m.$$

Accepted Answer

$$Q = \frac{0.44 	imes 3.336 	imes 10$$^{-30}$$}{1.61 	imes 10$$^{-10}$$} = 9.118 	imes 10$$^{-21}$$ C

Question 7

Which of the following statements about the VSEPR model is correct?

Accepted Answer

Lone pairs repel other lone pairs more strongly than they repel bonding pairs.

Question 8

What is the molecular geometry of SF$$_4$$ according to VSEPR theory?

Accepted Answer

Seesaw

Question 9

Which molecule has a T-shaped molecular geometry?

Accepted Answer

ClF$$_3$$

Question 10

A molecule has five electron groups around the central atom, two of which are lone pairs. What is its molecular geometry?

Accepted Answer

T-shaped

Question 11

Which of the following molecules is predicted to have a square planar molecular geometry?

Accepted Answer

XeF$$_4$$

Question 12

What is the electron-domain geometry and molecular geometry of NH$$_3$$?

Accepted Answer

Electron-domain geometry: tetrahedral; molecular geometry: trigonal pyramidal

Question 13

Which of the following best describes the geometry around the oxygen atom in ethanol (CH$$_3CH$_2OH$$)?

Accepted Answer

Bent, with a bond angle close to $$105^\circ$$

Question 14

Which molecule has a linear molecular geometry despite having five electron groups around the central atom?

Accepted Answer

XeF$$_2$$

Question 15

Which of the following molecules is predicted to have a dipole moment of zero?

Accepted Answer

CO$$_2$$

Question 16

Which molecule has a tetrahedral electron-domain geometry but a bent molecular geometry?

Accepted Answer

H$$_2O$$

Question 17

Which of the following is the correct formula for calculating the dipole moment ($$\mu) of a $$molecule?

Accepted Answer

$$\mu = Q 	imes r$$

Question 18

Which molecule has a trigonal bipyramidal electron-domain geometry and a linear molecular geometry?

Accepted Answer

XeF$$_2$$

Question 19

Which of the following best describes the bond angles in SF$$_6$$?

Accepted Answer

$$90^\circ$$ and $$180^\circ$$

Question 20

Which molecule has a square pyramidal molecular geometry?

Accepted Answer

BrF$$_5$$

chapter 7 part 2

Study Guide - Practice Questions

Study Guide - Flashcards