Q: Which equation best represents the heat required to raise the temperature of water, given its high specific heat?

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

Q: Which equation would you use to calculate the amount of heat energy required to change the temperature of 100 g of water by 10°C, given water's specific heat $$c = 4.18 \, \mathrm{J/g$$^{\circ}$$C}$$?

$$ Q = 100 \times 4.18 \times 10 $$

Question 1

Which property of water allows insects such as water striders to walk on its surface without sinking?

Accepted Answer

Surface tension due to cohesion

Question 2

Water molecules are polar because:

Accepted Answer

Oxygen has a higher electronegativity, creating partial charges

Question 3

Which equation best represents the heat required to raise the temperature of water, given its high specific heat?

Accepted Answer

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

Question 4

Why does ice float on liquid water?

Accepted Answer

Ice has a lower density because hydrogen bonds form a lattice structure

Question 5

Which property of water is most important for the transport of water from roots to leaves in plants?

Accepted Answer

Capillary action due to cohesion and adhesion

Question 6

A drop of water placed on a penny forms a dome shape. This is primarily due to:

Accepted Answer

Cohesion between water molecules

Question 7

Which of the following best explains why water is an excellent solvent for ionic compounds?

Accepted Answer

Water's polarity allows it to interact with charged ions

Question 8

Which of the following is a direct result of water's high specific heat capacity for living organisms?

Accepted Answer

Water resists sudden temperature changes, stabilizing environments

Question 9

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

Accepted Answer

Hydrogen bond

Question 10

Which scenario best illustrates the concept of adhesion?

Accepted Answer

Water climbing up a glass tube

Question 11

If a plant is unable to access water from the soil, which property of water is most likely impaired?

Accepted Answer

Capillary action

Question 12

Which of the following best describes the molecular structure of water?

Accepted Answer

Bent molecule with polar covalent bonds

Question 13

Which property of water is responsible for its ability to dissolve many substances?

Accepted Answer

Polarity and hydrogen bonding

Question 14

Which equation would you use to calculate the amount of heat energy required to change the temperature of 100 g of water by 10°C, given water's specific heat $$c = 4.18 \, \mathrm{J/g$$^{\circ}$$C}$$?

Accepted Answer

$$ Q = 100 	imes 4.18 	imes 10 $$

Question 15

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

Accepted Answer

Rapid temperature changes

Question 16

A scientist observes that water beads up on a waxed car surface but spreads out on clean glass. Which property of water explains this difference?

Accepted Answer

Adhesion

Question 17

Which of the following best explains why sweating helps cool the human body?

Accepted Answer

Evaporation of water absorbs heat due to high heat of vaporization

Question 18

Which property of water allows lakes to remain liquid under ice during winter, supporting aquatic life?

Accepted Answer

Low density of ice

Question 19

Which of the following is an example of water's cohesive property in nature?

Accepted Answer

Water droplets forming on spider webs

Question 20

Which statement best describes the difference between cohesion and adhesion in water?

Accepted Answer

Cohesion is water sticking to itself; adhesion is water sticking to other surfaces

Properties and Structure of Water in Biological Systems

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