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Questions and Answers
What are the two gases from which water is formed?
What are the two gases from which water is formed?
Oxygen and hydrogen
What is the molecular formula of water?
What is the molecular formula of water?
H2O
What happens to the boiling point of water when pressure is increased?
What happens to the boiling point of water when pressure is increased?
The boiling point of water increases
Why does ice float on water?
Why does ice float on water?
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How does the anomalous expansion of water help aquatic organisms in cold climates?
How does the anomalous expansion of water help aquatic organisms in cold climates?
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Why does seawater not freeze at 0°C?
Why does seawater not freeze at 0°C?
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What are the four main sources of water?
What are the four main sources of water?
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State the importance of the water cycle in nature.
State the importance of the water cycle in nature.
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Why is water very precious for all living beings?
Why is water very precious for all living beings?
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Why is water considered a universal solvent?
Why is water considered a universal solvent?
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How does water contribute to the human body?
How does water contribute to the human body?
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How do fruits and vegetables contribute to the water intake of living organisms?
How do fruits and vegetables contribute to the water intake of living organisms?
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Study Notes
Formation of Water
- Water is formed from two gases: hydrogen and oxygen.
Molecular Formula of Water
- The molecular formula of water is H2O, consisting of two hydrogen atoms and one oxygen atom.
Boiling Point of Water
- When pressure is increased, the boiling point of water also increases.
Properties of Ice and Water
- Ice floats on water because it is less dense than liquid water.
Importance of Anomalous Expansion
- The anomalous expansion of water helps aquatic organisms in cold climates by providing a layer of insulation, allowing them to survive underneath the ice.
Freezing Point of Seawater
- Seawater does not freeze at 0°C due to the presence of dissolved salts, which lower its freezing point.
Sources of Water
- The four main sources of water are:
- Rainwater
- Surface water (lakes, rivers, and glaciers)
- Groundwater (underground water)
- Ice caps and glaciers
Water Cycle
- The water cycle is crucial in nature, as it:
- Enables the circulation of water between the Earth and atmosphere
- Supports plant growth and agriculture
- Maintains Earth's climate and weather patterns
Importance of Water for Living Beings
- Water is very precious for all living beings because it:
- Sustains life processes
- Regulates body temperature
- Supports metabolic functions
- Enables cellular processes
Properties of Water as a Solvent
- Water is considered a universal solvent due to its ability to dissolve a wide range of substances, making it essential for biological and chemical reactions.
Contribution of Water to the Human Body
- Water contributes to the human body by:
- Making up approximately 60% of an adult's body weight
- Regulating body temperature
- Transporting nutrients and oxygen to cells
- Removing waste products
Fruits and Vegetables as a Source of Water
- Fruits and vegetables contribute to the water intake of living organisms by providing a significant amount of water through their consumption.
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Description
Test your knowledge of the ICSE Solutions for Class 8 Chemistry Chapter 8 - Water Solutions to boost your self-confidence for final exams. Explore topics like states of water and physical and chemical properties of water covered in this chapter.
