12 Questions
What are the two gases from which water is formed?
Oxygen and hydrogen
What is the molecular formula of water?
H2O
What happens to the boiling point of water when pressure is increased?
The boiling point of water increases
Why does ice float on water?
Ice has a low density compared to water
How does the anomalous expansion of water help aquatic organisms in cold climates?
It helps the survival of water animals by forming a protective layer of ice
Why does seawater not freeze at 0°C?
Seawater has impurities dissolved in it which raise the freezing point
What are the four main sources of water?
Oceans, Seas, Rivers and Lakes
State the importance of the water cycle in nature.
(i) Water cycle helps in regulating weather on the earth. (ii) It makes water available in various forms on the earth.
Why is water very precious for all living beings?
Water is very important for the existence of life. Since life on the earth began in the oceans, and nothing can live on earth without water, so it is rightly called the source of life.
Why is water considered a universal solvent?
Water has the ability to dissolve a number of substances, making it a good solvent for various reactions and processes.
How does water contribute to the human body?
Water forms a large part of the body mass of all living organisms - 90% of human blood is water. Water serves as the liquid medium in which all reactions within the living body take place.
How do fruits and vegetables contribute to the water intake of living organisms?
Fruits and vegetables contain water in them, which contributes to the hydration and water intake of living organisms.
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.
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