In this article you will find information related to ICSC|Chemistry|Class 6|Water
 |
| Topic-Water |
But all the water available on the earth is not suitable to be used. The main sources on the earth from which we get water are -
1.Oceans - Oceans cover a large surface of the earth.
2.Sea - The largest source of natural water is sea. But sea water is salty and has a large amount of salt in it so sea water can't be used directly for drinking and irrigation.
3.Rivers - Water present in rivers is mostly obtained from rain or glaciers. This river water consists of a lot of impurities as the river collects a lot of stones, minerals and mud as it flows down from hills . This river water is used for most of the industrial and domestic activities.
4.Ground water - The ground water doesn't contain any suspended impurities so it is pure. It consists of minerals .
Rainwater - The purest form of water is rainwater as during the evaporation the impurities are left behind on the earth. But it again brings impurities from the atmosphere as it comes down on the earth.
States of Water
*Water exists in all the three states of matter which are solid, liquid and gas i.e steam or water vapours.
*These three states of water have same physical properties but differ from each other in their chemical properties.
*These three states of matter can be interconverted in nature. This is known as water cycle.
Water Cycle
Due to the heat of the sun the water in the lakes, rivers and oceans is converted in its gaseous form i.e water vapours and rises up to the sky to form clouds.This process of the changing of liquid into gas is called evaporation.
Condensation
When the water vapours in the clouds cool down they change again into water. This process of the changing of water vapours (gas) into liquid is known as condensation.
Precipitation
When the clouds become heavy , they burst and the water comes down in the form of rain, snow, hail and sleet. This process is called precipitation.
Collection
Water that falls down is again collected into the water bodies i.e rivers, lakes and oceans. This cycle is repeated again and again and is known as water cycle.
Importance of Water
Commercial water use includes the use of water in offices, schools, shops, malls, hotels and other commercial places or institutions.
Domestic water use includes the use of water for everyday activities such as drinking,cooking, washing clothes and utensils, cleaning floors, watering plants etc.
Industrial water use includes the use of water for manufacturing, cleaning, diluting and transportation. The industries which use large quantity of water are paper, chemical, steel and petroleum refining industry.
Irrigation water use refers to the process of application of water to crops, farms, pastures and orchards and also to the harvesting, cooling and leaching of the salt from the crop root zone.
Non-agricultural use of water refers to the process of self-supplying water to the parks or private golf courses for irrigation.
Portable Water
Portable water refers to the water that is needed for drinking by humans. It should be -
1.clean
2.germ-free and should not have any suspended impurities.
3.have some amount ofof potassium, magnesium, zinc etc.
Water borne diseases are caused by drinking dirty water. Some diseases caused by dirty water are cholera, dysentery, hepatitis A ,giardia
etc.
Purification of Water
Water should be cleaned before drinking to prevent water borne diseases.
Coagulation
In this process alum and other chemicals are added to water. The impurities suspended in water attach to these particles.
Sedimentation
The suspended impurities become heavy after they attach with these particles and settle down at the bottom. This water is then transferred to the filtration chamber.
Filtration
Water is passed slowly through this chamber over the layers of sand, gravel and charcoal. Finer particles are filtered out with the help of this process.
Disinfection
Water is further cleaned by killing bacteria or any other living organisms present in water by adding chlorine to it. This process is known as chlorination.
Ozonization
Ozone has excellent disinfectant and oxidation properties. So it is also added through this process of water purification.
Storage
*This purified water is then transferred to huge water tanks. This water is left undisturbed for sometime so that the process of disinfection is completed.
*With the help of large pipes these water tanks are joined with our homes and workplaces.
*Water can be purified at homes by boiling. Germs can be killed by the process of boiling.
*Passing water through cloth also free it from sand and large particles.
*You can add chlorine to the water tanks at home to disinfect the water.
*RO systems can also be installed at home to purify the water.
Hope this article ICSC Class 6 | Chemistry|Water would be helpful to you. Please share it and comment if you want article on any other topic. You may also practice Worksheets for Science related to this topic.
Related Topics
Worksheets for Science Topic- Kidneys Dialysis
Worksheets for Science Topic- Parts and Functions of Nervous System
Worksheets for Science Topic-Functions of a Nervous System
Worksheets for Science Topic- The Human Skull Bones
Worksheets for Science Topic- Kidneys Transplantation Cost
Worksheets for Science Topic- Infection in Kidneys
Worksheets for Science Topic- The Human Brain Anatomy
Worksheets for Science Topic- Larynx Anatomy
Worksheets for Science Topic- Spinal Cord in Humans -Spinal Cord Structure and Spinal Cord Injury
Worksheets for Science - Topic- Spinal Cord Injury
Worksheets for Science Topic- Structure of the Teeth
Worksheets for Science Topic- Minerals Types
Worksheets for Science Topic-Which Vitamins are soluble in water?
Worksheets for Science Topic- Healthy Diet Plan
0 Comments