Question 1

Which property of water allows insects such as water striders to walk on the surface of a pond without breaking the surface?

Accepted Answer

Cohesion due to hydrogen bonding

Question 2

Which of the following best explains why coastal areas have milder climates than inland areas at the same latitude?

Accepted Answer

Water has a high specific heat, moderating temperature changes.

Question 3

Which of the following best describes the difference between cohesion and adhesion in water?

Accepted Answer

Cohesion is the attraction between water molecules; adhesion is the attraction between water and other substances.

Question 4

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

Accepted Answer

Ice floats on liquid water.

Question 5

A student spills water on a paper towel. The towel absorbs the water. Which property of water is primarily responsible for this phenomenon?

Accepted Answer

Adhesion

Question 6

Which of the following equations correctly represents the dissociation of water?

Accepted Answer

$$H_2O \rightarrow H^+ + OH^-$$

Question 7

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

Accepted Answer

Water absorbs heat as it evaporates due to its high heat of vaporization.

Question 8

Which of the following is NOT a product of the dissociation of water in pure water?

Accepted Answer

Bicarbonate ion ($$HCO_3$$^-$$)

Question 9

Which of the following best describes how the bicarbonate buffer system helps maintain pH in human blood?

Accepted Answer

It converts strong acids and bases into weak acids and bases, minimizing pH changes.

Question 10

Ocean acidification is primarily caused by which of the following processes?

Accepted Answer

Absorption of atmospheric $$CO_2 by $$seawater, forming carbonic acid

Question 11

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 12

Which of the following is a correct statement about hydrophobic and hydrophilic substances?

Accepted Answer

Hydrophilic substances have an affinity for water and dissolve easily.

Question 13

You are asked to make a 1M (1 mol/L) solution of ethyl alcohol ($$C_2H_6O). $$Which of the following steps is correct?

Accepted Answer

Add 1 mole of $$C_2H_6O to $$less than 1 L of water, then add water until the total volume is 1 L.

Question 14

Which of the following best describes the cause of capillary action in plants?

Accepted Answer

Cohesion and adhesion of water molecules

Question 15

If the concentration of $$H^+ in a $$solution is $$1 	imes 10$$^{-7}$$ M, what is the pH of the solution?

Accepted Answer

$$pH = 7$$

Question 16

Which of the following scenarios best illustrates the concept of temperature as it relates to kinetic energy?

Accepted Answer

A pot of boiling water contains molecules moving faster than those in a glass of ice water.

Question 17

Which of the following is a likely consequence of ocean acidification for marine life?

Accepted Answer

Decreased ability of organisms to form shells and skeletons

Question 18

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

Accepted Answer

Water molecules are polar and can surround and separate ions and polar molecules.

Question 19

Which of the following best describes the relationship between heat and temperature?

Accepted Answer

Heat is the total kinetic energy of molecules; temperature is the average kinetic energy.

Question 20

A glass of water is filled to the brim, and a slight dome forms above the rim without spilling. Which property of water is responsible for this phenomenon?

Accepted Answer

Surface tension due to cohesion

Water Properties and Their Biological Significance

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