Question 1

Which property of water allows a water strider to walk on the surface of a pond without sinking?

Accepted Answer

Cohesion due to hydrogen bonding

Question 2

Why does ice float on liquid water?

Accepted Answer

Hydrogen bonds in ice form a stable, open lattice that makes ice less dense

Question 3

Which of the following best explains why salt (NaCl) dissolves in water?

Accepted Answer

The partial charges on water molecules attract and separate Na+ and Cl- ions

Question 4

Which of the following molecules is nonpolar?

Accepted Answer

Methane ($$\mathrm{CH_4$})$$

Question 5

What type of bond holds the two strands of DNA together?

Accepted Answer

Hydrogen bonds

Question 6

Which of the following statements about hydrogen bonds is TRUE?

Accepted Answer

Hydrogen bonds form between a partially positive hydrogen and a highly electronegative atom

Question 7

A molecule of water ($$\mathrm{H_2O}) is $$considered polar because:

Accepted Answer

Oxygen is more electronegative than hydrogen, creating partial charges

Question 8

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

Accepted Answer

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

Question 9

Which of the following is an emergent property of water that helps moderate Earth's climate?

Accepted Answer

Water's high heat of vaporization

Question 10

Which of the following best explains why nonpolar molecules do not dissolve in water?

Accepted Answer

Nonpolar molecules are hydrophobic and cannot interact with water's partial charges

Question 11

Which of the following bonds is the strongest?

Accepted Answer

Covalent bond

Question 12

Given the electronegativities: H = 2.1, O = 3.44, what is the difference in electronegativity between O and H in water, and what type of bond does this create?

Accepted Answer

$$3.44 - 2.1 = 1.34$$, creating a polar covalent bond

Question 13

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

Accepted Answer

Water's polarity allows it to interact with and separate charged and polar solutes

Question 14

Which of the following is NOT a consequence of hydrogen bonding in water?

Accepted Answer

Water being nonpolar

Question 15

Which of the following best explains why temperatures are milder near large bodies of water?

Accepted Answer

Water has a high specific heat, so it absorbs and releases heat slowly

Question 16

Which of the following statements about the bond between O and H within a water molecule is correct?

Accepted Answer

It is a polar covalent bond

Question 17

Which of the following is a real-life example of adhesion?

Accepted Answer

Water being pulled up through the xylem of a plant

Question 18

Which of the following best describes the role of hydrogen bonds in protein structure?

Accepted Answer

Hydrogen bonds stabilize the folded shapes of proteins

Question 19

Which of the following is the correct order of density from least to most dense for water in different states?

Accepted Answer

Ice, warm water, cold water

Question 20

Which of the following is TRUE about electrons in hydrogen bonds?

Accepted Answer

Electrons are not shared in hydrogen bonds

Water and Its Essential Role in Life: Structure, Properties, and Biological Significance CHP 4

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