DSERT - 8 - Science :: Water
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[AUTHOR: GAYATHRI ARUN]
Dear Volunteer,
Please find below the detailed lesson plan and PPT for this chapter in the language mentioned against the respective link. While the lesson plan will give an overall flow of the lesson, the PPT will include lesson flow as well as the presentations for the class.
https://drive.google.com/open?id=1CsTaQf8gelmDM9y2CCLVVr1pWIHRM61N (Lesson Plan - English)
https://drive.google.com/open?id=1U_o26Vwy2-C71Zyh50GiGe-WXAm-Mgji(PPT - English)
You may use the content as it is or download and modify them to suit the students requirements.
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The worksheets of the lesson can be accessed from the worksheet tab.
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[Contributor - Anu Nived]
http://ktbs.kar.nic.in/New/website%20textbooks/class8/8th-english-science-2.pdf#page=3 (English Medium)
http://ktbs.kar.nic.in/New/website%20textbooks/class8/8th-kannada-science-2.pdf#page=3 (Kannada Medium)
[AUTHOR: GAYATHRI ARUN]
Explain in detail about the purification of water pg 2
• https://www.youtube.com/watch?v=UxVMTx-vl1Y
• https://www.youtube.com/watch?v=t2ByryOO-dk
Explain in detail about the chemical properties of water pg 2
• https://www.youtube.com/watch?v=FJsfjaU-8nI
• https://www.youtube.com/watch?v=h0py6BFlFZw
Explain in detail about the action of water on metal pg 3
• https://socratic.org/questions/do-magnesium-aluminium-and-zinc-can-react-with-water
• https://www.youtube.com/watch?v=iUrXu9YQkm4
Explain in detail about the action of steam on non-metals pg 4
• https://www.youtube.com/watch?v=R-SdJihkoUg
• https://www.youtube.com/watch?v=J904M8YUdSQ
Explain in detail about the uses of water gas pg 4
• https://www.youtube.com/watch?v=4V5ZC5LsWhI
• https://www.exploratorium.edu/snacks/having-gas-with-water
Explain in detail about the acid rain pg 5
https://www.youtube.com/watch?v=1PDjVDIrFec
https://www.youtube.com/watch?v=lIXZGJ4QF9E
Explain in detail reaction of water with metallic oxides pg 5
https://www.youtube.com/watch?v=SseNbvpwNjk
Explain in detail Deliquescent Substances pg 5
https://www.youtube.com/watch?v=KyRyQwGkMQE
Explain in detail Efflorescent substances pg 6
Explain in detail Hard water pg 6
• https://www.youtube.com/watch?v=ebygQes5Wig
• https://www.youtube.com/watch?v=bBYsfEHKYCk
Explain in detail Soft water pg 7
Explain in detail Methods of removal of hardness of water
Pg 7
https://www.youtube.com/watch?v=5C-yyZfDhl8
[AUTHOR: GAYATHRI ARUN ]
KEYWORDS
Activity 1
Dip a piece of blue or red litmus paper in pure water. What inference do you draw from this activity?
ACTIVITY 2
Write the equation for the reaction between potassium and water.
ACTIVITY 3
Take a clean piece of sodium. Dry it using blotting paper. Cut a small piece of it about the size of a green gram dhal. Drop it carefully into water taken in a beaker. Notice that the sodium piece moves randomly on the surface reacting with water violently. It gradually diminishes in size and finally disappears. It reacts with water forming sodium hydroxide and hydrogen .Test the resulting liquid in the beaker with blue and red litmus papers. The solution is basic.
ACTIVITY 1
Take a dish and put some sodium nitrate and keep it exposed to air for 5-10 minutes. Observe the changes, Write your observations. Sodium nitrate becomes wet. Potassium nitrate does not become wet when exposed to air. Can you give reason for this?
ACTIVITY 2
Write the equation of softening of hard water containing magnesium salts with sodium carbonate.
ACTIVITY 3
Experiment to show the removal of hardness of water by washing soda Materials required : 1. beaker 2. glass rod 3. washing soda (sodium carbonate) 4. hard water Take some hard water in a beaker and add a small quantity of washing soda to it. Stir it with a glass rod. Allow the insoluble carbonates to settle down as precipitate. Filter or decant the liquid.
ACTIVITY 4
Take a dish and put some sodium nitrate and keep it exposed to air for 5-10 minutes. Observe the changes, Write your observations. Sodium nitrate becomes wet. Potassium nitrate does not become wet when exposed to air. Can you give reason for this?
ACTIVITY 5
Write the equation of softening of hard water containing magnesium salts with sodium carbonate.
ACTIVITY 6
Experiment to show the removal of hardness of water by washing soda Materials required : 1. beaker 2. glass rod 3. washing soda (sodium carbonate) 4. hard water Take some hard water in a beaker and add a small quantity of washing soda to it. Stir it with a glass rod. Allow the insoluble carbonates to settle down as precipitate. Filter or decant the liquid. Water, so obtained is soft. But it is unfit for drinking as it contains excess of washing soda and excess of sodium salts.
ACTIVITY 7
Behavior of soap with hard water and soft water
Materials required: Hard water, 1 g of soap (from any transparent soap), 200 mL warm distilled water, 0.5 g of Epsom salt (MgSO4.7H2O) washing soda.
Procedure: 1. Make a soap solution by dissolving about 1 g of soap in 100 ml of warm distilled water. Allow the solution to cool. 2. Prepare a solution of hard water by dissolving about 0.5 g of Epsom salt in 100 ml of distilled water. 3. In a test tube, take a small quantity of hard water and add the soap solution to it drop by drop. Stir it well. What do you observe? You may observe very little lather being formed. 4. In another test tube, take the same quantity of the hard water and add a pinch of washing soda and shake vigorously. Allow the precipitate to settle. To this, add the soap solution drop-by-drop and stir it well. What do you observe?
You will find that a large amount of lather is formed.
[AUTHOR: GAYATHRI ARUN ]
Lesson Plan Version 1.1
https://drive.google.com/open?id=1CsTaQf8gelmDM9y2CCLVVr1pWIHRM61N
[Contributor - Tirtha M Anwekar]
https://drive.google.com/open?id=11HGRw0SimE9NQWH93RWZDMYObkot61tX (Question Bank)





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