TNSB - 8 - Science :: Changes Around Us

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Go To: TNSB-Sci-Grade 8

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Course content
Textbook
Teaching learning resources

Course Content / Subtopic list:

Chemical changes
Factors
Effects of Chemical changes

Expected Learning Outcome:

SWBAT-

Define chemical reaction
Differentiate chemical changes from physical changes
Identify the chemical reactions in day to day life,observe the changes during a chemical reaction

English Medium

English medium textbook

Tamil Medium

Tamil medium textbook

Lesson Plan

[Contributor - Juhi Patil]

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=13crN1wvAUMc5n6_TbLztg5AeST4UiXId (Lesson Plan - English)

https://drive.google.com/open?id=1FumXsQqY7sJhtXEfY9WbeEHPYaJRM1NE (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.

Videos

[Contributor - Juhi Patil]

Lesson Plan version 1.1 video

https://www.youtube.com/watch?v=LQ-prcAHM_U (Chemical reaction based on physical contact)

https://www.youtube.com/watch?v=QZm98NXH1WQ (Chemical reaction based on catalyst)

https://www.youtube.com/watch?v=yg1FYLx7AU4 (Quciklime and water reaction)

https://www.youtube.com/watch?v=71fQGSj3yTE (Hydrogen gas popping test)

https://www.youtube.com/watch?v=WGx55g0YYm4 (Reaction of zinc and dilute sulphuric acid)

Activities

[Contributor - Juhi Patil]

Lesson Plan version 1.1 activities

1. Identify as Physical or Chemical changes:

1. Melting of ice, 2. Ripening of fruits, 3.Rusting of iron, 4. Spoilage of food, 5. Burning of wood, 6. Bursting crackers, 7. Burning of camphor, 8. Browning of apples, 9. Running of steam engine, 10. Combustion of petrol and diesel, 11. recycling of plastics

2. Take two test tubes and couple of rust free iron nails. In one test tube pour some water and put an iron nail. Keep the test tube opened for few days. Take another test tube and pour some water as well. But this time pour some coconut oil above the water level to completely immerse the nail inside. Now, place the second iron nail. Leave the set up for a few days. Observe the changes and record them

3. Buy some fresh yeast from a grocery shop nearby. Prepare a paste of wheat our with water in a vessel. Add some yeast and leave the vessel closed for few hours under sunlight. Observe the changes closely. What do you infer?

4. Add quicklime to water. Observe and note the changes. What do you infer?

5. Take a clean test tube. Add some dilute hydrochloric acid. Drop a piece of magnesium or a piece of zinc metal. What do you see? Now bring a burning matchstick near the mouth of the test tube.