Question 1

According to VSEPR theory, what is the molecular shape and bond angle of a molecule of $$\mathrm{CO_2$}$$?

Accepted Answer

Linear, $$180^\circ$$

Question 2

Which of the following molecules is nonpolar, despite having polar bonds?

Accepted Answer

$$\mathrm{$$CCl_4$$}$$

Question 3

A molecule of $$\mathrm{SO_2$}$$ has three electron groups around the central atom. What is its molecular shape and approximate bond angle?

Accepted Answer

Bent, $$120^\circ$$

Question 4

Which of the following best explains why $$\mathrm{H_2O} is a $$polar molecule?

Accepted Answer

It has a bent shape and the dipoles do not cancel.

Question 5

Which molecule has a trigonal pyramidal shape according to VSEPR theory?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 6

A molecule of $$\mathrm{PF_3$}$$ has how many electron groups and what is its molecular shape?

Accepted Answer

Four electron groups, trigonal pyramidal

Question 7

Which of the following molecules is polar due to its molecular geometry?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 8

What is the electron-group geometry and molecular shape of $$\mathrm{H_2S}$$?

Accepted Answer

Tetrahedral electron-group geometry, bent molecular shape

Question 9

Which of the following statements about $$\mathrm{CH_4$} is $$correct?

Accepted Answer

It has a tetrahedral shape with bond angles of $$109^\circ.$$

Question 10

Which molecule is nonpolar because its molecular geometry causes the dipoles to cancel?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 11

A molecule of $$\mathrm{OF_2$}$$ has four electron groups around the central atom. What is its molecular shape and polarity?

Accepted Answer

Bent, polar

Question 12

Which of the following best describes the electron-group geometry and molecular shape of $$\mathrm{NH_3$}$$?

Accepted Answer

Tetrahedral electron-group geometry, trigonal pyramidal molecular shape

Question 13

Which of the following molecules is polar due to the presence of a single polar bond?

Accepted Answer

$$\mathrm{HCl}$$

Question 14

Which of the following molecules has a bond angle closest to $$120^\circ$$?

Accepted Answer

$$\mathrm{H_2CO}$$

Question 15

A molecule of $$\mathrm{H_2O}$$ has how many lone pairs and how many bonded atoms on the central atom?

Accepted Answer

Two lone pairs, two bonded atoms

Question 16

Which of the following best describes why $$\mathrm{$$CCl_4$$} is $$nonpolar?

Accepted Answer

It has polar bonds, but the tetrahedral geometry causes the dipoles to cancel.

Question 17

Which of the following molecules has a bent shape due to two lone pairs on the central atom?

Accepted Answer

$$\mathrm{H_2O}$$

Question 18

Which molecule is polar because its shape prevents the dipoles from canceling, resulting in a partial negative charge on the central atom?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 19

Which of the following molecules has a tetrahedral electron-group geometry but a bent molecular shape?

Accepted Answer

$$\mathrm{H_2O}$$

Question 20

Which of the following best describes the polarity of $$\mathrm{$$PBr_3$$}$$?

Accepted Answer

Polar, because the dipoles do not cancel due to its trigonal pyramidal shape

Shapes and Polarity of Molecules: VSEPR Theory and Molecular Geometry

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