Question 1

Which property of water is primarily responsible for its high surface tension and ability to form droplets on surfaces?

Accepted Answer

Its extensive hydrogen bonding

Question 2

Why does water have a much higher boiling point than other molecules of similar molecular weight, such as ammonia ($$\mathrm{NH_3$}) or $$methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

Because water forms strong hydrogen bonds between molecules

Question 3

A water molecule can form how many hydrogen bonds with neighboring water molecules?

Accepted Answer

4

Question 4

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

Accepted Answer

Hydrogen bonds in ice create an open lattice structure, making it less dense than liquid water

Question 5

How does water interact with sodium chloride ($$\mathrm{NaCl}) $$when it dissolves in water?

Accepted Answer

Water molecules form hydration shells around both $$\mathrm{Na^+}$$ and $$\mathrm{Cl^-}$$ ions

Question 6

Which of the following is NOT a unique property of water due to hydrogen bonding?

Accepted Answer

Low boiling point

Question 7

What is the main reason hydrophobic molecules aggregate in water?

Accepted Answer

Water molecules push hydrophobic molecules together to maximize water-water hydrogen bonding

Question 8

Which of the following best describes the interaction between water and amphiphilic molecules such as fatty acids?

Accepted Answer

Water forms hydration shells around the hydrophilic heads, leading to micelle formation

Question 9

Which of the following statements about water's interaction with ions is correct?

Accepted Answer

Water's partially positive hydrogen atoms orient toward anions, and its partially negative oxygen atom orients toward cations

Question 10

Which of the following real-life phenomena is a direct result of water's high heat capacity?

Accepted Answer

Lakes and oceans moderating Earth's climate by absorbing and releasing heat slowly

Question 11

A student claims that water's high boiling point is due to its high molecular weight. Which of the following best refutes this claim?

Accepted Answer

Water's boiling point is much higher than expected for its molecular weight due to hydrogen bonding

Question 12

Which structure is formed when water surrounds nonpolar (hydrophobic) molecules?

Accepted Answer

Clathrate (cage) structure

Question 13

Which of the following best explains why water is considered a 'universal solvent'?

Accepted Answer

Water's polarity and ability to form hydrogen bonds allow it to dissolve many ionic and polar substances

Question 14

Which of the following is a consequence of water's expansion upon freezing?

Accepted Answer

Ice floats on water, insulating aquatic life in winter

Question 15

A researcher observes that when a nonpolar solute is added to water, the water molecules form an ordered structure around it. What is this structure called, and what is its significance?

Accepted Answer

Clathrate; it decreases the entropy of water

Properties of Water and Hydrogen Bonding in Biochemistry

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