Chem 352: Weak Noncovalent Interactions in Lysozyme Molecule

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Why do amphipathic molecules like soaps and detergents aggregate in water?

To hide their hydrophilic parts from water and expose the hydrophobic parts to water

To prevent any interaction with water molecules

To expose their hydrophilic parts to water and remove the hydrophobic parts from water (correct)

To maintain a balance between their hydrophilic and hydrophobic parts in water

Which type of solution has a pH value of less than 7 according to the text?

Basic solution

Pure water

Acidic solution (correct)

Neutral solution

What is the role of acids in modifying the concentration of H+ ions in a solution?

Stabilize the H+ concentration

Have no effect on the H+ concentration

Decrease the H+ concentration

Increase the H+ concentration (correct)

In what type of solution do hydrophobic substances tend to aggregate?

Basic solution Signup and view all the answers

How is the pH of a solution defined?

Negative logarithm of H+ concentration Signup and view all the answers

Which type of molecule forms micelles in water when placed in it?

Soaps and detergents Signup and view all the answers

What type of substances dissolve readily in water?

Hydrophilic substances Signup and view all the answers

What happens when water cannot interact favorably with a molecule?

It forms highly organized clathrate structures around the molecule. Signup and view all the answers

What is the term used for molecules with significantly hydrophilic and hydrophobic parts?

Amphipathic Signup and view all the answers

Why do hydrophobic molecules not dissolve well in water?

Water molecules surround them with clathrate structures. Signup and view all the answers

Which type of regions on a protein's surface attract water molecules?

Ionic and polar regions Signup and view all the answers

What kind of interactions are responsible for the dissolving of hydrophilic substances in water?

Noncovalent interactions Signup and view all the answers

Why do oil molecules repel water?

Because they have nonpolar bonds Signup and view all the answers

Which term describes a stable suspension of fine particles in a liquid?

Colloid Signup and view all the answers

What type of substances have an affinity for water?

Hydrophilic substances Signup and view all the answers

Why do hydrophobic molecules not dissolve in water easily?

Because they are nonpolar and repel water Signup and view all the answers

What characteristic of a substance makes it hydrophilic?

Forming hydrogen bonds with water Signup and view all the answers

Which property allows water to dissolve many salts and polar molecules?

Hydrogen bonding potential Signup and view all the answers

Why does ice float in liquid water?

Because ice is less dense than liquid water due to more ordered hydrogen bonds Signup and view all the answers

What property of water helps stabilize temperatures in organisms and bodies of water through evaporative cooling?

High heat of vaporization Signup and view all the answers