Chemical Concepts

Which property of water helps determine the three-dimensional folding of a protein and its interactions with other molecules?

• Its color

• Its polarity

• Its boiling point

• Its density

What is the main reason water is considered a polar molecule?

• Equal charge distribution between O and H

• Unequal charge distribution between O and H

• Water is nonpolar

• Water has no charge

Which statement best describes the hydrophobic effect?

• Polar molecules cluster together in water

• Nonpolar molecules cluster together to minimize the number of water molecules forced to be ordered

• Water molecules form strong covalent bonds with nonpolar molecules

• Water dissolves all types of molecules equally

What is the concentration of water in pure water?

• 1.0 M

• 10.0 M

• 55.5 M

• 100.0 M

Which type of bonding is described as "weak" and involves the sharing of electrons between atoms?

• Covalent bonding

• Non-covalent bonding

• Ionic bonding

• Metallic bonding

What is an example of electrostatic non-covalent bonding?

• Permanent dipole-dipole interactions

• Covalent bonds

• Metallic bonds

• Hydrogen bonds only

Why is it energetically unfavorable for organic molecules to impose a rigid structure (ice-like) to surrounding water molecules?

• It increases the temperature of water

• It decreases the solubility of water

• It is less structured and thus energetically unfavorable

• It increases the boiling point of water

Which of the following best describes a temporary dipole-induced dipole attraction?

• A sharing of hydrogen between electronegative atoms

• An attraction such as van der Waals (dispersion) forces

• A combination of hydrogen bond and ionic interaction

• The dissociation of water molecules into ions

What term is used to describe molecules that are both polar and non-polar?

• Amphoteric

• Amphipathic

• Hydrophobic

• Isotonic

What is the ion product of water (Kw) at standard conditions?

• 1 × 10^{-7} M

• 1 × 10^{-10} M

• 1 × 10^{-14} M