$$q = m \times c \times \Delta T$$

Question 1

Which property of water allows it to dissolve table salt (NaCl) so effectively?

Accepted Answer

Water's polarity and ability to form hydration shells around ions

Question 2

What type of bond forms between the oxygen atom of one water molecule and the hydrogen atom of another water molecule?

Accepted Answer

Hydrogen bond

Question 3

Why is water considered a polar molecule?

Accepted Answer

Because oxygen is more electronegative, creating partial charges ($$\delta^+$$ and $$\delta^-)$$

Question 4

Which of the following best explains why oil does not dissolve in water?

Accepted Answer

Oil is nonpolar and cannot form hydrogen bonds with water

Question 5

A plant is able to transport water from its roots to its leaves. Which properties of water are primarily responsible for this process?

Accepted Answer

Cohesion and adhesion

Question 6

When water is heated and converted to steam, which bonds are primarily broken?

Accepted Answer

Hydrogen bonds between water molecules

Question 7

Which of the following equations correctly represents the energy required to raise the temperature of 1 gram of water by 1°C?

Accepted Answer

$$q = m 	imes c 	imes \Delta T$$

Question 8

Which statement best describes a polar covalent bond?

Accepted Answer

Electrons are shared unequally, resulting in partial charges

Question 9

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

Accepted Answer

Because of the hydrogen bonds that absorb heat when they break and release heat when they form

Question 10

Which of the following best explains why salt (NaCl) dissolves in water but not in oil?

Accepted Answer

Water is polar and stabilizes Na$$^+$$ and Cl$$^-$$ ions, while oil is nonpolar and cannot

Question 11

Which property of water is most responsible for the formation of droplets on a waxed car hood?

Accepted Answer

Cohesion

Question 12

A sugar cube dissolves in water. Which property of water is most important for this process?

Accepted Answer

Water's ability to form hydrogen bonds with polar molecules

Question 13

Which of the following molecules would NOT dissolve well in water?

Accepted Answer

Methane ($$CH_4)$$

Question 14

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

Accepted Answer

Cohesion is attraction between the same substance; adhesion is attraction between different substances

Question 15

Which of the following is an example of a nonpolar covalent bond?

Accepted Answer

The bond between two hydrogen atoms in $$H_2$$

Question 16

Which property of water helps moderate Earth's climate by absorbing heat from the sun during the day and releasing it at night?

Accepted Answer

High specific heat

Question 17

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

Accepted Answer

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

Question 18

Which of the following is true about the valence electrons of oxygen in a water molecule?

Accepted Answer

Oxygen has two pairs of unshared valence electrons

Question 19

Which of the following best describes the interaction between Na$$^+$$ and water molecules when NaCl dissolves in water?

Accepted Answer

The oxygen atom of water is attracted to Na$$^+$$

Question 20

Which property of water allows insects to walk on its surface?

Accepted Answer

Surface tension due to cohesion

Water and Carbon: The Chemical Basis of Life – Structure and Properties of Water

Study Guide - Practice Questions