DSERT - 8 - Science :: Chemicals in our daily life

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Go To: DSERT-Science-Grade 8

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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=1OmZXrB0E9bAUqNeGKIbISwGWNdBFegwG (Lesson Plan - English)


https://drive.google.com/open?id=1GRJ2SEES_EwTTlp6CqzdNoj2VMd_mSCo(PPT - English)


You may use the content as it is or download and modify them to suit the students requirements.


If you feel any major modifications or additions are carried out by you in the form of adding any new activity, presentations, videos etc. we request you to send the modified version to submitcontent@evidyloka.org for enabling upload the modified version.


The worksheets of the lesson can be accessed from the worksheet tab.


Kindly rate the lesson plan and share your suggestions and comments on the lesson plan in the comments box below. Your valuble suggestions and comments will help us to improve the content.


[AUTHOR: GAYATHRI ARUN]


Activity 1

When you purchase medicines, read the constituents of the medicine on its wrapper and list out the chlorine compounds used in the medicines.


ACTIVITY 2

Heat sulphur in a spoon. Hold a most blue litmus paper to the liberated gas. What do you observe?


ACTIVITY 3

Place a bottle on the table and remove the lid. Carefully pour 2 table spoons of vinegar into the bottle. • Put 1 teaspoon of baking soda into a balloon using a separate spoon. • Without spilling baking soda, stretch the mouth of the balloon over the mouth of the bottle. • Turn the balloon completely upright so that baking soda inside the balloon falls into the bottle on the vinegar. Watch! •

• What happens inside the bottle?

• What happens to the balloon? Why?

ACTIVITY 4

Prepare solutions of the following substances: washing soda, calcium hydroxide, lemon juice, bleaching powder, vinegar, detergent, baking soda, and Soda water. Put a drop of each of the above solutions on a separate watch-glasses and test by dipping red and blue litmus papers. What happens? Why ?

ACTIVITY 5

Take a spoon of baking soda. Observe its colour and physical state • Put blue and red litmus into the solution of baking soda. What happens? What do you understand? • Take aqueous sodium bicarbonate solution in a test tube and heat it. The evolved gas is passed through lime water. What do you observe? Which is the gas liberated?

• Squeeze a piece of lemon on sodium bicarbonate in a test tube. What happens?

• Pass the gas through lime water. What happens?

Based on the above activities list out the properties of Sodium bicarbonate


ACTIVITY 1

Are you interested in preparing soap? Take 30 ml of vegetable oil in a beaker. Dissolve 20 g of sodium hydroxide in 100 ml of water in another beaker. Take 60 ml of this solution and add this to 30ml of oil. Heat the mixture slowly until the mixture boils. After 15-20 minutes of boiling, add about 5 g of sodium chloride to the mixture. Stir well. What do you observe?

Take soap out of the beaker and spread it on a tray and allow it to dry. Now soap is ready to be used




















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