Q: Which equation correctly represents the calculation of specific heat ($$c) $$when the heat ($$q) $$required to raise the temperature of a mass ($$m) of $$water by a temperature change ($$\Delta T) is $$known?

$$c = \frac{q}{m \times \Delta T}$$

Question 1

Which type of bond is primarily responsible for the cohesion between water molecules, allowing for surface tension?

Accepted Answer

Hydrogen bonds

Question 2

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

Accepted Answer

Density of solid ice is lower than liquid water

Question 3

A spider can walk across the surface of a pond without sinking. Which property of water makes this possible?

Accepted Answer

Surface tension

Question 4

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

Accepted Answer

Because of the abundance of hydrogen bonds that absorb heat when they break

Question 5

Which equation correctly represents the calculation of specific heat ($$c) $$when the heat ($$q) $$required to raise the temperature of a mass ($$m) of $$water by a temperature change ($$\Delta T) is $$known?

Accepted Answer

$$c = \frac{q}{m 	imes \Delta T}$$

Question 6

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

Accepted Answer

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

Question 7

If 100 g of water absorbs 4200 J of heat, what is the temperature change ($$\Delta T) $$given that the specific heat of water is $$4.2 \ \mathrm{J/g^\circ C}$$?

Accepted Answer

$$\Delta T = 10^\circ \mathrm{C}$$

Question 8

Which property of water explains why salt (NaCl) dissolves easily in it?

Accepted Answer

Water is a universal solvent due to its polarity

Question 9

A beaker contains 200 g of water at $$25^\circ \mathrm{C}. $$How much heat ($$q) is $$required to raise the temperature to $$35^\circ \mathrm{C}$$? (Specific heat of water $$c = 4.18 \ \mathrm{J/g^\circ C})$$

Accepted Answer

$$q = 8360 \ \mathrm{J}$$

Question 10

Which of the following is NOT an emergent property of water?

Accepted Answer

Low boiling point

Question 11

What is the main reason ice floats on liquid water?

Accepted Answer

Ice has a lower density due to stable hydrogen bonds forming a lattice structure

Question 12

Which of the following best describes the polarity of a water molecule?

Accepted Answer

The oxygen atom is slightly negative, and the hydrogen atoms are slightly positive

Question 13

Which of the following scenarios demonstrates water's high heat of vaporization in a real-world context?

Accepted Answer

Sweating during exercise helps cool the body as water evaporates from the skin

Question 14

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

Accepted Answer

It can dissolve a wide variety of substances due to its polarity

Question 15

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

Accepted Answer

Water droplets forming on a leaf after rain

Question 16

A solution in which water is the solvent is called:

Accepted Answer

Aqueous

Question 17

Which of the following best describes the process of hydrogen bonding in water?

Accepted Answer

A hydrogen atom of one water molecule is attracted to the oxygen atom of another water molecule

Question 18

Which property of water is most important for maintaining stable temperatures in organisms and environments?

Accepted Answer

High specific heat

Question 19

Which of the following statements about the density of water and ice is correct?

Accepted Answer

Ice is less dense than liquid water because its hydrogen bonds form a stable lattice structure

Question 20

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

Accepted Answer

Some insects can walk on water without sinking

Properties of Water: Structure, Bonding, and Biological Importance

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