Question 1

Given the Lewis structure of water ($$\ce{H2O}$$), which direction do the dipole moments point, and is the molecule overall polar or nonpolar?

Accepted Answer

Dipoles point from hydrogen to oxygen; the molecule is polar.

Question 2

What is the correct name for the compound with the formula $$\ce{NaCl}$$, and is it ionic or covalent?

Accepted Answer

Sodium chloride; ionic

Question 3

Write the chemical formula for dinitrogen tetroxide.

Accepted Answer

$$\ce{N2O4}$$

Question 4

Which of the following molecules has a trigonal planar electron geometry and is nonpolar?

Accepted Answer

$$\ce{BF3}$$

Question 5

Draw the Lewis structure for $$\ce{CO2}. $$What is the molecular shape, bond angle, and is it polar or nonpolar?

Accepted Answer

Linear, $$180^\circ$$, nonpolar

Question 6

Which compound below exhibits hydrogen bonding as its strongest intermolecular force?

Accepted Answer

$$\ce{CH3OH}$$

Question 7

Which of the following compounds would you expect to have the highest boiling point?

Accepted Answer

$$\ce{H2O}$$

Question 8

Given the Lewis structure for ammonia ($$\ce{NH3}$$), what is the electron geometry, molecular shape, and approximate bond angle?

Accepted Answer

Tetrahedral electron geometry, trigonal pyramidal shape, $$107^\circ$$

Question 9

Which of the following is a covalent compound?

Accepted Answer

$$\ce{SO2}$$

Question 10

Which of the following best describes the dipole moment in $$\ce{HCl}$$?

Accepted Answer

Points from H to Cl; molecule is polar

Question 11

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

Accepted Answer

$$\ce{CO2}$$

Question 12

What is the correct name for the compound $$\ce{PCl5}$$?

Accepted Answer

Phosphorus pentachloride

Question 13

Which of the following has the greatest number of lone pairs on the central atom?

Accepted Answer

$$\ce{H2O}$$

Question 14

Which of the following best explains why $$\ce{NaCl} is $$solid at room temperature while $$\ce{H2O} is $$liquid?

Accepted Answer

Ionic bonds in $$\ce{NaCl}$$ are much stronger than hydrogen bonds in $$\ce{H2O}.$$

Question 15

Which of the following molecules has a bond angle closest to $$109.5^\circ$$?

Accepted Answer

$$\ce{CH4}$$

Question 16

Which of the following compounds is most likely to be soluble in water?

Accepted Answer

$$\ce{NaNO3}$$

Question 17

Which of the following best describes the electron geometry and molecular shape of $$\ce{SO2}$$?

Accepted Answer

Trigonal planar electron geometry, bent molecular shape

Question 18

Which of the following is the correct formula for calcium phosphate?

Accepted Answer

$$\ce{Ca3(PO4)2}$$

Question 19

Which of the following molecules has only London dispersion forces as its strongest intermolecular force?

Accepted Answer

$$\ce{CCl4}$$

Question 20

Which of the following best explains why $$\ce{CO2} is $$nonpolar even though it contains polar bonds?

Accepted Answer

The molecule is linear and the bond dipoles cancel each other out.

GOB Chemistry Study Guide: Molecular Structure, Bonding, and Intermolecular Forces

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