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

Question 1

Which property of water allows it to move upward through the stem of a plant against gravity, enabling water transport from roots to leaves?

Accepted Answer

Cohesion and adhesion

Question 2

What type of bond is primarily responsible for water's high cohesion and surface tension?

Accepted Answer

Hydrogen bonds

Question 3

A small cup of hot coffee and a large swimming pool are both at $$50\ ^\circ\mathrm{C}. $$Which contains more heat energy, and why?

Accepted Answer

The swimming pool, because it has more molecules to store energy

Question 4

Which equation correctly relates heat ($$q$$), mass ($$m$$), specific heat ($$c$$), and temperature change ($$\Delta T) $$for a substance?

Accepted Answer

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

Question 5

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

Accepted Answer

Because hydrogen bonds between water molecules require more energy to break

Question 6

Which property of water is most important for evaporative cooling in plants?

Accepted Answer

High heat of vaporization

Question 7

If two bodies of water are at the same temperature, but one is much larger in volume, which has more total heat energy?

Accepted Answer

The larger body, because it contains more molecules

Question 8

Which of the following best describes adhesion in water?

Accepted Answer

Water molecules sticking to other surfaces

Question 9

Why is the Celsius scale preferred in biology over Fahrenheit?

Accepted Answer

Celsius is based on the freezing and boiling points of water, which are biologically relevant

Question 10

Which property of water allows it to absorb or release a large amount of energy with only a slight change in temperature?

Accepted Answer

High specific heat

Question 11

A drop of water clings to the surface of a leaf after rain. Which property of water is responsible for this phenomenon?

Accepted Answer

Adhesion

Question 12

Which of the following is the best explanation for why sweating cools the human body?

Accepted Answer

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

Question 13

Which of the following statements about temperature and heat is correct?

Accepted Answer

Heat is the total energy, while temperature is the average kinetic energy of molecules

Question 14

What is the specific heat of water in calories per gram per degree Celsius?

Accepted Answer

$$1\ \mathrm{cal} / \mathrm{g} / ^\circ\mathrm{C}$$

Question 15

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

Accepted Answer

High specific heat

Question 16

If you wanted to convert a temperature from Celsius to Kelvin, which equation would you use?

Accepted Answer

$$K = ^\circ\mathrm{C} + 273$$

Question 17

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

Accepted Answer

Hydrogen bonds in ice create a lattice that makes it less dense than liquid water

Question 18

Which property of water is most important for the movement of water from land surfaces or plants into the atmosphere?

Accepted Answer

High heat of vaporization

Question 19

Which of the following is a direct consequence of water's high surface tension?

Accepted Answer

Small insects can walk on water

Question 20

Which of the following best describes the role of hydrogen bonds in water's unique properties?

Accepted Answer

They allow water to have high cohesion, adhesion, and specific heat

Properties of Water: Cohesion, Adhesion, Surface Tension, and Specific Heat

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