Question 1

Which property of water is primarily responsible for the ability of plants to transport water from their roots to their leaves against gravity?

Accepted Answer

Capillary action

Question 2

What type of chemical bond is formed when electrons are shared equally between two atoms?

Accepted Answer

Nonpolar covalent bond

Question 3

Why does ice float on water?

Accepted Answer

Ice is less dense than liquid water because hydrogen bonds form a crystalline structure that spaces molecules apart

Question 4

Which of the following best explains why water has a high specific heat?

Accepted Answer

Hydrogen bonds between water molecules require significant energy to break

Question 5

A solution has a pH of 3. Which of the following statements is true?

Accepted Answer

The solution is acidic and contains more H+ ions than OH- ions

Question 6

Which equation correctly represents the dissociation of water?

Accepted Answer

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

Question 7

What is the main reason water is considered a versatile solvent?

Accepted Answer

Water molecules are attracted to ions and other polar molecules due to their polarity

Question 8

Which of the following best describes a buffer in a biological system?

Accepted Answer

A buffer resists changes in pH when an acid or base is added

Question 9

Which property of water helps prevent terrestrial organisms from overheating?

Accepted Answer

Evaporative cooling

Question 10

If potassium chloride (KCl) is mixed with water, what happens at the molecular level?

Accepted Answer

K+ ions are surrounded by the partially negative oxygen atoms of water, and Cl- ions are surrounded by the partially positive hydrogen atoms

Question 11

Which of the following is an example of a trace element and its biological role?

Accepted Answer

Iron (Fe): required for oxygen transport in hemoglobin

Question 12

Which statement about hydrogen bonds in water is correct?

Accepted Answer

Hydrogen bonds form between the partially positive hydrogen atom of one water molecule and the partially negative oxygen atom of another water molecule

Question 13

Which property of water is most directly responsible for surface tension?

Accepted Answer

Cohesion

Question 14

How many hydrogen bonds can one molecule of water form with its neighboring water molecules in ice?

Accepted Answer

Four

Question 15

Which of the following best describes the octet rule?

Accepted Answer

Atoms will gain, lose, or share electrons to complete their outermost shell with eight electrons

Question 16

Which of the following is true about electronegativity?

Accepted Answer

Electronegativity increases across a period from left to right

Question 17

Which of the following is a consequence if ice were more dense than liquid water?

Accepted Answer

Ice would sink, potentially causing bodies of water to freeze solid from the bottom up

Question 18

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

Accepted Answer

Cohesion is the attraction between water molecules themselves, while adhesion is the attraction between water molecules and other substances

Question 19

Which of the following is NOT a property of water that contributes to its role in supporting life?

Accepted Answer

Ability to dissolve nonpolar substances

Structure of Water, Hydrogen Bonding, and Properties of Water

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