Question 1

Which property of water allows insects like water striders to walk on the surface of a pond without sinking?

Accepted Answer

Cohesion due to hydrogen bonding

Question 2

Water is described as a polar molecule. What does this mean in terms of its atomic structure?

Accepted Answer

The oxygen atom has a partial negative charge and the hydrogen atoms have partial positive charges

Question 3

Why does ice float on liquid water?

Accepted Answer

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

Question 4

Which of the following best explains why sweating cools the human body?

Accepted Answer

Evaporative cooling removes heat as high-energy water molecules leave the skin surface

Question 5

A plant transports water from its roots to its leaves through capillary action. Which two properties of water are directly involved in this process?

Accepted Answer

Cohesion and adhesion

Question 6

Which statement correctly describes the role of hydrogen bonds in water’s high specific heat?

Accepted Answer

Hydrogen bonds must be broken for water molecules to move faster, requiring more heat energy

Question 7

A solution has a pH of 4. How many times more acidic is it than a solution with a pH of 7?

Accepted Answer

$$1000$$

Question 8

Which property of water is most important for dissolving ionic compounds like table salt (NaCl)?

Accepted Answer

Water’s polarity

Question 9

If a buffer is added to a solution, what is its primary function?

Accepted Answer

To minimize changes in pH by accepting or donating H$$^+$$ ions

Question 10

Which of the following best describes adhesion in water?

Accepted Answer

Water molecules clinging to other substances

Question 11

A scientist adds a base to a solution. What happens to the concentration of H$$^+$$ ions?

Accepted Answer

It decreases

Question 12

Which property of water helps stabilize ocean temperatures and supports marine life?

Accepted Answer

High specific heat

Question 13

Which of the following is true about the pH scale?

Accepted Answer

Each whole number change represents a 10-fold change in H$$^+$$ concentration

Question 14

Which scenario best illustrates water’s role as a 'solvent of life'?

Accepted Answer

Salt dissolving in water to form an aqueous solution

Question 15

Which of the following is a direct consequence of water’s ability to form hydrogen bonds?

Accepted Answer

Water has high surface tension

Question 16

If a lake freezes over in winter, what property of water prevents the entire body of water from freezing solid?

Accepted Answer

Ice being less dense than liquid water

Question 17

Which process involves both cohesion and adhesion in plants?

Accepted Answer

Transpiration via capillary action

Question 18

A student mixes oil and water in a beaker. The oil does not dissolve. Which property of water explains this observation?

Accepted Answer

Water is a polar molecule and oil is nonpolar

Question 19

Which of the following best explains why water can absorb a large amount of heat without a significant increase in temperature?

Accepted Answer

Hydrogen bonds require energy to break, so much heat is absorbed before temperature rises

Question 20

A solution has a pH of 9. Which of the following statements is correct?

Accepted Answer

The solution has a lower concentration of H$$^+$$ ions than a solution with pH 7

Properties of Water: Structure, Behavior, and Biological Importance

Study Guide - Practice Questions