Page 82 - ICSE Chemistry 6

• Ships, boats and sailboats that run in water are used for transpor ng human beings and goods
from one place to another.
• Water is needed for many recrea on and sport ac vi es such as swimming, river ra ing, boa ng
and water skiing.
• We get various food items like fi sh, seaweed, oil, natural gas, medicines, minerals and various
building materials from oceans.

• Many rivers have been converted into huge water bodies by construc ng dams to store water in
the rainy season and supply water when needed. Water stored in dams is also used to generate
electricity which is called hydroelectric power.

watering plants hydropower generation water transport

fire extinguishing river rafting houseboat
Fig. 4.7: Importance of water

Take a Break!

Write/Choose the correct answer.
1. ___________ (Rainwater/Surface water) is the purest form of water.

2. Groundwater contains dissolved salt and is free from suspended impuri es. (True/False)
3. The molecules of ice, water and steam are diff erent. (True/False)

4. The density of water is maximum at ___________.
5. ___________ is the amount of heat energy required to raise the temperature of a liquid
by 1°C.

6. Large amount of water is also given out by the leaves of plants during ___________.
7. Water helps in the excre on of waste from the body in the form of ___________, urine or while
breathing.

8. Water is very important for ___________ of seeds.

68