Question 1

Which property of water is primarily responsible for the ability of some insects to walk on the surface of a pond without sinking?

Accepted Answer

Cohesion due to hydrogen bonding

Question 2

A sodium atom (Na) has 11 protons and 11 electrons. After it loses one electron to form Na$$^+$$, what is the resulting charge and why?

Accepted Answer

Positive, because it has more protons than electrons

Question 3

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

Accepted Answer

Hydrogen bonds cause water molecules in ice to be spaced farther apart, making ice less dense

Question 4

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity increases from left to right across a period

Question 5

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

Accepted Answer

Four

Question 6

Which of the following best describes the difference between a covalent bond and a hydrogen bond?

Accepted Answer

A covalent bond involves the sharing of electrons between atoms, while a hydrogen bond is an attraction between a partially positive hydrogen and an electronegative atom

Question 7

Why does water have a high specific heat compared to many other substances?

Accepted Answer

Because hydrogen bonds must be broken to increase the temperature of water

Question 8

Which scenario best illustrates the concept of 'like dissolves like' with respect to water's solvent properties?

Accepted Answer

Water dissolving table salt (NaCl) because both are polar

Question 9

A plant is able to transport water from its roots to its leaves against gravity. Which combination of water's properties is most directly responsible for this phenomenon?

Accepted Answer

Cohesion and adhesion

Question 10

If ice were more dense than liquid water, which of the following would most likely occur in aquatic environments during winter?

Accepted Answer

Ice would sink, causing bodies of water to freeze from the bottom up and threatening aquatic life

Question 11

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

Accepted Answer

Evaporation of sweat absorbs heat from the body due to water's high heat of vaporization

Question 12

Which of the following is a direct result of water's polarity?

Accepted Answer

Water molecules form hydrogen bonds with each other

Question 13

A solution is made by dissolving potassium chloride (KCl) in water. Which statement best describes the interaction between KCl and water molecules?

Accepted Answer

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

Question 14

Which of the following best describes a polar covalent bond?

Accepted Answer

Electrons are shared unequally between two atoms, resulting in partial charges

Question 15

Which property of water is most important for maintaining stable temperatures in oceans and lakes?

Accepted Answer

High specific heat

Question 16

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

Accepted Answer

Water's ability to dissolve nonpolar substances

Question 17

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

Accepted Answer

Water's polar molecules surround and separate the Na$$^+$$ and Cl$$^-$$ ions

Question 18

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

Accepted Answer

It is the upward movement of water due to the combined forces of cohesion, adhesion, and surface tension

Question 19

Which of the following is a trace element required by living organisms in very small quantities?

Accepted Answer

Iron (Fe)

Question 20

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

Accepted Answer

Its polarity allows it to dissolve many ionic and polar substances

Structure of Water and Hydrogen Bonding: Chemistry Foundations for Biology

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