Q: Which of the following equations correctly represents the energy ($$q) $$required to raise the temperature of a given mass ($$m) of $$water by a temperature change ($$\Delta T$$), given water's specific heat ($$c$$)?

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

Question 1

Which property of water is primarily responsible for the upward movement of water in plant xylem against gravity?

Accepted Answer

Capillary action

Question 2

Why does ice float on liquid water, and what would be a likely consequence for aquatic life if ice were more dense than liquid water?

Accepted Answer

Ice floats because it is less dense due to hydrogen bonds forming a crystalline structure; if ice were denser, lakes would freeze solid from the bottom up, threatening aquatic life.

Question 3

A student mixes potassium chloride (KCl) in water. Which statement best explains what happens at the molecular level?

Accepted Answer

Water molecules surround K+ ions with their oxygen atoms and Cl- ions with their hydrogen atoms, dissolving the salt.

Question 4

Which property of water allows sweating to cool the human body, and what is the underlying mechanism?

Accepted Answer

Evaporative cooling; water absorbs heat as it evaporates, removing energy from the skin.

Question 5

Which of the following best describes why water has a high specific heat?

Accepted Answer

Hydrogen bonds between water molecules require significant energy to break, so water absorbs a lot of heat before its temperature rises.

Question 6

A biologist observes that water beads up on a waxy leaf surface. Which property of water is most directly responsible for this phenomenon?

Accepted Answer

Cohesion

Question 7

Which of the following equations correctly represents the energy ($$q) $$required to raise the temperature of a given mass ($$m) of $$water by a temperature change ($$\Delta T$$), given water's specific heat ($$c$$)?

Accepted Answer

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

Question 8

Which property of water is most important for maintaining stable temperatures in large bodies of water, such as oceans?

Accepted Answer

High specific heat

Question 9

A protein is placed in water and dissolves. Which property of water allows this to happen, and why?

Accepted Answer

Water's polarity allows it to form hydrogen bonds with polar regions of the protein, dissolving it.

Question 10

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

Accepted Answer

Water's polar molecules can surround and interact with many ions and polar molecules, dissolving them.

Question 11

If a plant's xylem walls were coated with a hydrophobic substance, which property of water would be most directly affected, and what would be the likely result?

Accepted Answer

Adhesion would decrease, reducing water's ability to climb the xylem and impairing nutrient transport.

Question 12

Which of the following scenarios best illustrates the concept of 'like dissolves like' in water's solvent properties?

Accepted Answer

Table salt (NaCl) dissolves in water because both are polar or charged.

Question 13

Which of the following is a direct consequence of water's high heat of vaporization for living organisms?

Accepted Answer

Organisms can cool themselves efficiently through sweating or transpiration.

Question 14

A researcher adds a drop of water to a glass slide and observes that it forms a nearly spherical shape. Which property of water is most responsible for this observation?

Accepted Answer

Surface tension due to cohesion among water molecules

Question 15

Which of the following best explains why water moderates Earth's climate?

Accepted Answer

Water's high specific heat allows it to absorb and release large amounts of heat with little temperature change.

Question 16

Which of the following best describes the molecular structure of ice compared to liquid water?

Accepted Answer

Ice has a 3D crystalline structure stabilized by hydrogen bonds, making it less dense than liquid water.

Question 17

If the hydrogen bonds in water were significantly weaker, which of the following would most likely occur?

Accepted Answer

Water would have a lower boiling point and evaporate more easily, making it less effective for temperature regulation.

Question 18

Which property of water is most important for the survival of fish in a frozen pond during winter?

Accepted Answer

Ice is less dense than liquid water, so it floats and insulates the water below.

Question 19

Which of the following best explains why water can climb up a narrow tube against gravity?

Accepted Answer

Capillary action, resulting from both adhesion to the tube walls and cohesion among water molecules

Question 20

A solution is made by dissolving sugar in water. Which term best describes water in this context?

Accepted Answer

Solvent

Properties of Water: Essential Concepts for General Biology

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