Question 1

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

Accepted Answer

CO$$_2$$

Question 2

What is the main type of intermolecular force present in a sample of Br$$_2$$?

Accepted Answer

Dispersion forces

Question 3

Given the electronegativity values O: 3.5 and F: 4.0, what type of bond is present in OF$$_2$$?

Accepted Answer

Polar covalent

Question 4

Which molecule would have the highest melting point due to its intermolecular forces?

Accepted Answer

NaCl

Question 5

Why is CCl$$_4$$ classified as a nonpolar molecule?

Accepted Answer

Its polar bonds are arranged symmetrically and the dipoles cancel out

Question 6

Which of the following best describes hydrogen bonding?

Accepted Answer

A strong dipole-dipole attraction between hydrogen bonded to F, O, or N and a lone pair on F, O, or N

Question 7

A patient is given a medication that is a nonpolar molecule. Which type of intermolecular force will primarily affect its solubility in water?

Accepted Answer

Dispersion forces

Question 8

Which statement correctly explains why H$$_2O is a $$polar molecule?

Accepted Answer

The dipoles do not cancel due to the bent shape and lone pairs on oxygen

Question 9

Which of the following compounds will exhibit hydrogen bonding?

Accepted Answer

NH$$_3$$

Question 10

Which of the following molecules is expected to have the lowest boiling point?

Accepted Answer

CO$$_2$$

Question 11

A molecule has polar bonds but is nonpolar overall. Which of the following is the best explanation?

Accepted Answer

The molecule is linear and the dipoles cancel out

Question 12

Which intermolecular force is responsible for the double helix structure of DNA?

Accepted Answer

Hydrogen bonds

Question 13

Which of the following statements about ionic compounds is true?

Accepted Answer

They have high melting points due to strong attractive forces between ions

Question 14

Which molecule would you expect to be polar based on its structure and electronegativity differences?

Accepted Answer

NH$$_3$$

Question 15

Which of the following best describes dispersion forces?

Accepted Answer

Weak attractions caused by temporary dipoles in nonpolar molecules

Question 16

A chemist wants to predict the polarity of a molecule. What is the first step they should take?

Accepted Answer

Determine if the bonds are polar covalent or nonpolar covalent using electronegativity values

Question 17

Which of the following molecules will have only dispersion forces as its main intermolecular force?

Accepted Answer

CO$$_2$$

Question 18

Which of the following is a consequence of strong intermolecular forces in a substance?

Accepted Answer

High boiling point

Question 19

Which of the following molecules is nonpolar due to its symmetrical arrangement?

Accepted Answer

CCl$$_4$$

Question 20

Which type of attractive force is present in HBr?

Accepted Answer

Dipole-dipole attractions

Polarity of Molecules and Intermolecular Forces

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