Question 1

Which property of water is primarily responsible for the moderation of coastal climates?

Accepted Answer

Its high specific heat capacity

Question 2

What type of bond forms between the hydrogen atom of one water molecule and the oxygen atom of another water molecule?

Accepted Answer

Hydrogen bond

Question 3

Which of the following best explains why ice floats on liquid water?

Accepted Answer

Hydrogen bonds in ice create a lattice that is less dense than liquid water

Question 4

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

Accepted Answer

$$4$$

Question 5

Which statement correctly describes the relationship between acids, bases, and pH?

Accepted Answer

Acids decrease the pH by increasing proton concentration

Question 6

Why is sweating an effective way for humans to cool off?

Accepted Answer

Evaporation of sweat absorbs heat due to water's high heat of vaporization

Question 7

Which of the following best describes a buffer's role in biological systems?

Accepted Answer

Buffers minimize changes in pH by accepting or donating protons

Question 8

Which property of water allows it to dissolve many ionic and polar substances?

Accepted Answer

Its ability to form hydrogen bonds

Question 9

A scientist adds a strong acid to pure water, causing the pH to drop from 7 to 2. By what factor did the proton concentration increase?

Accepted Answer

$$10^5$$

Question 10

Which of the following scenarios best illustrates the concept of adhesion?

Accepted Answer

Water droplets sticking to a spider web

Question 11

If a coastal city experiences less temperature fluctuation than an inland city, which property of water is most responsible?

Accepted Answer

Water's high specific heat capacity

Question 12

Which of the following is a consequence of water's high specific heat for living organisms?

Accepted Answer

Stable internal temperatures despite environmental changes

Question 13

Which of the following best describes the electron distribution in a water molecule?

Accepted Answer

Oxygen has a partial negative charge, hydrogen has a partial positive charge

Question 14

A solution with a pH of 9 is considered:

Accepted Answer

Weakly basic

Question 15

Which of the following best explains why water is described as 'the universal solvent'?

Accepted Answer

Its polarity allows it to dissolve many ionic and polar substances

Question 16

Which process is most directly affected by water's surface tension?

Accepted Answer

Formation of droplets on a leaf

Question 17

Which of the following is true about hydrophobic substances?

Accepted Answer

They are 'water-fearing' and do not interact well with water

Question 18

Which of the following best describes the role of buffers in blood?

Accepted Answer

Buffers keep blood pH constant by neutralizing excess acids or bases

Question 19

Which of the following is a direct result of hydrogen bonding between water molecules?

Accepted Answer

Water's high heat of vaporization

Question 20

A lake freezes from the top down, allowing fish to survive below the ice. Which property of water explains this phenomenon?

Accepted Answer

Ice is less dense than liquid water due to hydrogen bonding

Chapter 3: Structure, Properties, and Biological Importance

Study Guide - Practice Questions