Intermolecular Forces Webquest Answer Key

Intermolecular Forces Webquest Answer Key Introduction:

As a student, understanding intermolecular forces is essential knowledge that will not only help you ace your Chemistry exams but also prepare you for a future in scientific research. However, navigating through the vast array of information can sometimes be daunting. Luckily, webquests can be excellent resources for gaining a comprehensive understanding of this complex topic. In this post, we have compiled a key to the answers for a popular intermolecular forces webquest to help you better grasp the concepts behind this topic. So, let’s dive in, shall we?

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Question 1:
Which intermolecular force is the dominant force of attraction between two molecules of methane (CH4)?

Answer: The Dipole-Dipole force.

Explanation: Methane is a non-polar molecule with an uncharged center and four identical polar bonds. The Dipole-dipole force is the dominant intermolecular force of attraction between methane molecules since the force is formed between the partial charges of polar bonds present in the methane molecule.

Question 2:
Which intermolecular force is important in holding together polyethylene and polystyrene?

Answer: The London Dispersion Force.

Explanation: Polyethylene and polystyrene molecules are non-polar and lack any dipole moment. The London dispersion force is the dominant intermolecular force of attraction between these molecules since it occurs due to the motions of electrons in a molecule.

Question 3:
Which intermolecular forces cancel out each other in the molecule HCl?

Answer: The Dipole-Dipole Force and London Dispersion Force.

Explanation: HCl has a polar covalent bond, resulting in a permanent dipole moment. At the same time, the London Dispersion force comes into play, attracting the molecules together. Given that London Dispersion forces are non-polar, they cancel out the Dipole-Dipole force, leaving only the Lonon Dispersion force as the dominant force between two HCl molecules.

Question 4:
Which intermolecular force gives surface tension to water?

Answer: The Hydrogen Bonding Force

Explanation: Water is a polar molecule that has a bent shape with two hydrogen atoms and one oxygen atom. The hydrogen bonding force is the primary force responsible for the high surface tension in water. These intermolecular forces arise due to the partial charges present on the hydrogen and oxygen atoms in water molecules, which create a polarity when bonded together.

Question 5:
Which three intermolecular forces contribute to the boiling point of a substance?

Answer: Dipole-dipole, London Dispersion, and Hydrogen Bonding.

Explanation: Boiling point refers to the temperature at which the vapor pressure of a liquid matches the pressure exerted above it, and it starts boiling. Hence, the boiling point will depend on the magnitude of the intermolecular forces present in the substance. The three main intermolecular forces contributing to the boiling point of a substance are the Dipole-dipole force, London Dispersion force, and Hydrogen Bonding.


In conclusion, Intermolecular forces are vital in explaining the physical properties of substances, such as melting and boiling points, surface tensions, and molecular interactions. Though the topic may seem complex, webquests can go a long way in helping you understand the various concepts of intermolecular forces. This post has provided you with an answer key to a popular intermolecular forces webquest that covers Dipole-Dipole, London Dispersion, and Hydrogen Bonding Forces. With the information provided above, you can ace your Chemistry exams and excel in scientific research.

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