Question 1

Which property of water is primarily responsible for the phenomenon of surface tension, allowing small insects to walk on water surfaces?

Accepted Answer

Cohesion due to hydrogen bonding

Question 2

Why does ice float on liquid water, and what is the biological significance of this property?

Accepted Answer

Ice forms a crystalline structure that is less dense than liquid water, creating an insulating layer.

Question 3

Which of the following best describes why water is an excellent solvent for polar and ionic substances?

Accepted Answer

Water molecules have a bent shape and partial charges, allowing them to form hydrogen bonds with solutes.

Question 4

A solution has a proton concentration of $$1 	imes 10$$^{-4}$$ \ \mathrm{M}. $$What is its pH?

Accepted Answer

$$4$$

Question 5

Which functional group is most likely to act as a base by attracting a proton?

Accepted Answer

Amino group

Question 6

Stanley Miller's 1953 experiment demonstrated that:

Accepted Answer

Complex organic molecules can be synthesized from simple molecules under early Earth conditions.

Question 7

Which of the following statements about acids and bases is correct?

Accepted Answer

Acids increase the concentration of hydronium ions ($$\mathrm{H_3O^+}) in $$solution.

Question 8

Which property of water explains why sweating is an effective way to cool off?

Accepted Answer

Water's high heat of vaporization

Question 9

Which of the following best describes a condensation (dehydration) reaction?

Accepted Answer

A reaction that joins monomers to form polymers, releasing water.

Question 10

Which of the following is NOT a characteristic of water that is critical for life?

Accepted Answer

Water is denser as a solid than as a liquid.

Question 11

Which of the following best explains why hydrophobic molecules tend to cluster together in water?

Accepted Answer

They interact via van der Waals forces, increasing the stability of the cluster.

Question 12

Which of the following is true about the pH scale?

Accepted Answer

A solution with pH 5 has ten times more hydrogen ions than a solution with pH 6.

Question 13

Which of the following statements about carbon is correct?

Accepted Answer

Carbon forms four covalent bonds due to its four valence electrons.

Question 14

Which functional group is most likely to act as an acid by donating a proton?

Accepted Answer

Carboxyl group

Question 15

Which of the following best describes a spontaneous chemical reaction?

Accepted Answer

A reaction where products are less ordered and have lower potential energy than reactants.

Question 16

Buffers are important in biological systems because they:

Accepted Answer

Maintain relatively constant pH by minimizing changes in proton concentration.

Question 17

Which of the following is a real-world example of water's adhesive property?

Accepted Answer

Water climbing up a paper towel dipped in a glass of water.

Question 18

Which of the following best describes the role of functional groups in organic molecules?

Accepted Answer

They determine the chemical behavior and reactivity of organic molecules.

Question 19

Which process increases entropy and is energetically favorable in aqueous solutions?

Accepted Answer

Hydrolysis of polymers

Question 20

Which of the following best explains why life is considered carbon-based?

Accepted Answer

Carbon can form a limitless array of molecular shapes by bonding with other elements.

Water and Carbon: The Chemical Basis of Life (Chapter 2 Study Notes)

Study Guide - Practice Questions