Water and Its Properties

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What is the chemical formula for water?

H2O

What are the three states of water in nature?

Solid (ice), liquid (water), and gas (water vapor).

What property of water allows it to dissolve many substances?

Its polarity and ability to form hydrogen bonds.

Why is water considered a universal solvent?

Because it can dissolve more substances than any other liquid.

What happens to water when it freezes?

It expands and becomes less dense, which is why ice floats on water.

At what temperature does water boil?

100 degrees Celsius (212 degrees Fahrenheit) at sea level.

What temperature does water freeze at?

0 degrees Celsius (32 degrees Fahrenheit).

What is surface tension in water?

It's the elastic tendency of water's surface which makes it acquire the least surface area possible, caused by hydrogen bonding.

What property of water helps regulate Earth's climate?

Its high specific heat capacity, which allows it to absorb and release heat slowly.

Why is water important for living organisms?

It is essential for processes like digestion, absorption, transporting nutrients, and temperature regulation.

What is the pH level of pure water?

Approximately 7, which is considered neutral.

What is cohesion in terms of water properties?

Cohesion refers to water molecules sticking to each other due to hydrogen bonding.

What is adhesion in water?

Adhesion is the property that makes water molecules stick to other surfaces.

What causes water to form droplets?

The cohesive forces between water molecules due to hydrogen bonds.

How does water contribute to weathering and erosion?

Water can break down rocks and soil through physical and chemical processes, contributing to landscape changes.





Test Your Knowledge

Select the correct option


1. What is the chemical formula for water?

H2O

HO2

O2H

OH2

2. What are the three states of water in nature?

Liquid, plasma, gas

Solid, liquid, plasma

Solid (ice), liquid (water), and gas (water vapor).

Vapor, liquid, gold

3. What property of water allows it to dissolve many substances?

Its magnetic field and ionic bonds.

Its polarity and ability to form hydrogen bonds.

Its elasticity and shape.

Its viscosity and thickness.

4. Why is water considered a universal solvent?

Because it is the hardest to dissolve other solids.

Because it is hydrophobic.

Because it can dissolve more substances than any other liquid.

Because it cannot dissolve gases.

5. What happens to water when it freezes?

It remains the same density but solidifies.

It expands and becomes less dense, which is why ice floats on water.

It contracts and becomes more dense.

It evaporates instantly into gas.

6. At what temperature does water boil?

100 degrees Celsius (212 degrees Fahrenheit) at sea level.

95 degrees Celsius (203 degrees Fahrenheit) at sea level.

105 degrees Celsius (221 degrees Fahrenheit) at sea level.

80 degrees Celsius (176 degrees Fahrenheit) at sea level.

7. What temperature does water freeze at?

5 degrees Celsius (41 degrees Fahrenheit).

0 degrees Celsius (32 degrees Fahrenheit).

-5 degrees Celsius (23 degrees Fahrenheit).

10 degrees Celsius (50 degrees Fahrenheit).

8. What is surface tension in water?

It's the elastic tendency of water's surface which makes it acquire the least surface area possible, caused by hydrogen bonding.

It's the magnetic pull of water molecules.

It's the temperature at which water pressure is maximal.

It's the rigidity of water's structure.

9. What property of water helps regulate Earth's climate?

Its low viscosity.

Its high specific heat capacity, which allows it to absorb and release heat slowly.

Its fluid density.

Its low boiling point.

10. Why is water important for living organisms?

It is essential for processes like digestion, absorption, transporting nutrients, and temperature regulation.

It provides color to organisms.

It removes the need for air.

It acts as a solid barrier.

11. What is the pH level of pure water?

3, which is very acidic.

14, which is very basic.

Approximately 7, which is considered neutral.

1, which is extremely acidic.

12. What is cohesion in terms of water properties?

Cohesion refers to water molecules sticking to each other due to hydrogen bonding.

Cohesion is the ability to repel other liquids.

Cohesion refers to water's temperature resistance.

Cohesion is the structural tension in solid water forms.

13. What is adhesion in water?

Adhesion is water's ability to stick to other water molecules.

Adhesion describes water's magnetic properties.

Adhesion is the property that makes water molecules stick to other surfaces.

Adhesion is the water's gravitational effect.

14. What causes water to form droplets?

The cohesive forces between water molecules due to hydrogen bonds.

Its magnetic attraction to metal objects.

Its reaction with atmospheric gases.

Its vaporization speed.

15. How does water contribute to weathering and erosion?

Water absorbs all solids entirely without a physical process.

Water can break down rocks and soil through physical and chemical processes, contributing to landscape changes.

Water has no effect as it evaporates instantly.

Water shields all geological structures from change.