Bio1332 Biochemistry - Lecture Eleven - Intermolecular Forces And Solubility

1.

Name the three main types of intermolecular forces.
2.

Name a biological role of hydrogen bonding.This will not go towards your final mark, but you may check your answer with the feedback section once you've submitted it.
3.

Does interaction between molecules with permanent dipoles enable compounds to dissolve?
- A.
  
  Yes
- B.
  
  No
Correct Answer
A. Yes

Explanation
The interaction between molecules with permanent dipoles, such as polar molecules, enables compounds to dissolve. This is because the positive end of one molecule is attracted to the negative end of another molecule, creating an electrostatic attraction. This interaction allows the molecules to mix and disperse evenly throughout a solvent, resulting in the dissolution of the compound.

Rate this question:
4.

How would you describe the induced dipoles in a Van der Waals interaction?
- A.
  
  Small, temporary
- B.
  
  Small, permanent
- C.
  
  Large, temporary
- D.
  
  Large, permanent
Correct Answer
A. Small, temporary

Explanation
In a Van der Waals interaction, the induced dipoles are small and temporary. This means that they are not permanent and only exist for a short period of time. These induced dipoles occur due to temporary fluctuations in electron distribution within molecules, creating temporary positive and negative charges. These temporary dipoles then induce dipoles in neighboring molecules, resulting in attractive forces between the molecules. However, once the external influence causing the temporary dipoles is removed, the molecules return to their original state with no permanent dipole moment.

Rate this question:
5.

Please complete the following sentence:Van der Waals interactions are vital in maintaining the ___________ of cells.

Correct Answer
Lipid bilayer
Cell membrane

Explanation
Van der Waals interactions are vital in maintaining the structure and stability of cells. These interactions occur between the lipid molecules that make up the lipid bilayer, which is the main component of the cell membrane. The hydrophobic tails of the lipid molecules interact through van der Waals forces, allowing the formation of a stable and flexible membrane. This membrane acts as a barrier, regulating the transport of molecules in and out of the cell, and maintaining the integrity and shape of the cell.

Rate this question:
6.

Solvation involves two compounds ________ together.
- A.
  
  Mixing
- B.
  
  Reacting
- C.
  
  Binding
Correct Answer
A. Mixing

Explanation
Solvation involves two compounds mixing together. This process occurs when a solute is dissolved in a solvent, resulting in the solute particles becoming dispersed and surrounded by the solvent particles. The solute and solvent interact with each other, forming a solution. Solvation is a physical process and does not involve a chemical reaction or binding between the compounds. Therefore, the correct answer is "Mixing."

Rate this question:
7.

For two substances to fully mix together (for something to dissolve), the sum of the intermolecular attractions between molecules after mixing must be _______________ the sum of the intermolecular attractions between the molecules before mixing.
- A.
  
  More than or equal to
- B.
  
  Less than or equal to
- C.
  
  Equal to
- D.
  
  More than
- E.
  
  Less than
Correct Answer
A. More than or equal to

Explanation
When two substances mix together, the intermolecular attractions between the molecules play a crucial role in determining whether they will dissolve or not. For complete dissolution to occur, the sum of the intermolecular attractions between the molecules after mixing must be more than or equal to the sum of the intermolecular attractions between the molecules before mixing. This means that the combined attractive forces between the molecules in the mixture should be at least as strong as the attractive forces between the molecules in their separate states.

Rate this question:
8.

Compounds which show extensive hydrogen bonding will not dissolve in water. True or False?
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
Compounds that show extensive hydrogen bonding tend to dissolve well in water. This is because water molecules are highly polar and can form hydrogen bonds with other polar molecules. These hydrogen bonds help to stabilize and solvate the compound, allowing it to dissolve in water. Therefore, the statement "Compounds which show extensive hydrogen bonding will not dissolve in water" is false.

Rate this question:

Bio1332 Biochemistry - Lecture Eleven - Intermolecular Forces And Solubility

Name the three main types of intermolecular forces.

Name a biological role of hydrogen bonding.This will not go towards your final mark, but you may check your answer with the feedback section once you've submitted it.

Does interaction between molecules with permanent dipoles enable compounds to dissolve?

How would you describe the induced dipoles in a Van der Waals interaction?

Please complete the following sentence:Van der Waals interactions are vital in maintaining the ___________ of cells.

Solvation involves two compounds ________ together.

For two substances to fully mix together (for something to dissolve), the sum of the intermolecular attractions between molecules after mixing must be _______________ the sum of the intermolecular attractions between the molecules before mixing.

Compounds which show extensive hydrogen bonding will not dissolve in water. True or False?