Water and Its Properties Quiz

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What is the molecular mass of water, represented as H₂O?

18 amu (correct)

12 amu

16 amu

20 amu

Which of the following best describes the physical states in which water can exist?

Solid, liquid, gas (correct)

Liquid, gas only

Solid, liquid only

Solid only

Approximately what percentage of the Earth's water is freshwater?

10%

2.5% (correct)

25%

50%

In covalent bonding of a water molecule, how many hydrogen atoms are bonded to the oxygen atom?

Two Signup and view all the answers

Which of these components is NOT part of the water cycle?

Filtration Signup and view all the answers

What makes water a universal solvent?

It can dissolve a variety of substances due to its polar nature. Signup and view all the answers

How does the high dielectric constant of water contribute to its solvent properties?

It reduces the forces of attraction between ions, aiding in dissolution. Signup and view all the answers

Which of the following statements is true regarding the solubility of substances in water?

Even substances that seem insoluble may dissolve in trace amounts. Signup and view all the answers

What role does water's high specific latent heat of vaporization play in thermoregulation?

It absorbs heat during evaporation, cooling the body. Signup and view all the answers

Why is water considered an effective coolant in applications like car radiators?

It can absorb a significant amount of heat without a large temperature change. Signup and view all the answers

What outcome was observed during the experiment with tap water on a watch glass?

Solid concentric rings indicated dissolved substances in the water. Signup and view all the answers

What does the specific heat capacity of water imply about its temperature change when heat is applied?

A large amount of heat is required to change the temperature of water slightly. Signup and view all the answers

Which property of water allows it to dissolve both polar substances and ionic compounds effectively?

The polar nature of water molecules. Signup and view all the answers

What happens to the boiling point of water as atmospheric pressure decreases?

The boiling point decreases. Signup and view all the answers

Why does ice float on water?

Water expands upon freezing. Signup and view all the answers

At what temperature does water achieve maximum density?

4°C Signup and view all the answers

What is the latent heat of fusion of ice?

The heat needed to change ice to water at 0°C. Signup and view all the answers

What effect do dissolved impurities have on the boiling and freezing points of water?

They lower both the boiling and freezing points. Signup and view all the answers

How much energy is approximately required to raise the temperature of 1g of water by 1°C?

4.2 J Signup and view all the answers

What is the freezing point of pure water under standard pressure?

0°C Signup and view all the answers

What consequence does anomalous expansion of water have in aquatic ecosystems?

It allows ice to insulate the water below. Signup and view all the answers

What is the approximate composition of air dissolved in water?

33% oxygen, 66% nitrogen, 1% carbon dioxide Signup and view all the answers

Which gas is more soluble in water compared to others based on the content?

Oxygen Signup and view all the answers

What indicates the presence of dissolved gases in the tap water during the experiment?

Formation of gas bubbles Signup and view all the answers

What role does dissolved oxygen play in aquatic ecosystems?

Supporting respiration in marine life Signup and view all the answers

How does dissolved carbon dioxide contribute to marine life?

It forms calcium bicarbonate for shell-building. Signup and view all the answers

Which of the following statements about the solubility of gases in water is incorrect?

Higher temperatures increase gas solubility. Signup and view all the answers

What is the primary purpose of the experiment described?

To demonstrate the presence of dissolved gases in water Signup and view all the answers

Which gas has a solubility expressed as 506 volumes per unit volume at 0°C?

Hydrogen chloride Signup and view all the answers