APSB - 7 - Science :: Changes around us

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Go To: APSB-Sci-Grade 7

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Course content
Textbook
Teaching learning resources

Course Content / Subtopic list:

Physical and chemical changes substances with examples
Crystallization
Galvanisation

Expected Learning Outcome:

SWBAT-

Differentiate between physical and chemical changes
Explain the crystallization with ex
Describe the galvanisation

Semester 1

TextBook Link

Semester 2

TextBook Link

Lesson Plan

[Contributor - Ankita Srivastava]

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=1KV3xPs3QjzGRQedJ3CcO8S8S5kGR2K8Y (Lesson Plan - English)

https://drive.google.com/open?id=102x3mbrWFtUgutKCCpLBcX8Ve4sTxyPGZ (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

[Author - Kripa S]

https://www.youtube.com/watch?v=Nk7UUEY0vZ4 ( Changes around Us)

[Contributor - Ankita Srivastava]

Lesson Plan version 1.1 videos

https://www.youtube.com/watch?v=PRbMEtUMuNk (periodic and non periodic changes)

https://www.youtube.com/watch?v=BgM3e8YZxuc (Physical and chemical changes)

https://www.youtube.com/watch?v=XMr4vse7Ybo (Rusting and corrosion)

https://www.youtube.com/watch?v=BdMewIiRkUs (Rusting and galvanization)

https://www.youtube.com/watch?v=AUOqgvmSyqQ (Ways to stop fruit browning)

https://www.youtube.com/watch?v=tbu-egineUo (Crystallization)

https://www.youtube.com/watch?v=O02xLFUq30Y (Crystallization of copper sulphate)

Images

[Author - Anu Nived]

https://s-media-cache-ak0.pinimg.com/originals/af/a0/f8/afa0f8775ea5c6de7b7a5b1006e3b427.jpg (reversible change)

http://k8schoollessons.com/wp-content/uploads/2013/02/irreversible-changes-examples-frying.png (irreversible change)

Activities

[Author - Kripa S]

1. Pick three students. Ask each student what happens when they

a) rolled out atta to make a roti

b) stretch a rubber band

c) Fold a piece of paper

2. Explain reversible and irreversible changes:

a) Measure the length of a piece of paper, fold it and then measure again. The shape of the paper changes. Unfold the piece of paper. It is now its original length.

b) Make a hole in a piece of paper. Ask the students to fill in the hole and make the paper as it was before. Is it possible?

[Contributor - Ankita Srivastava]

Lesson Plan version 1.1 activities

1. Take few pieces of ice in a beaker and heat them.

2. Take an apple, a brinjal, a potato, a tomato, a cucumber, a banana; cut each into small pieces; place them in separate plates and expose them to open air for some time. Record your observation.

3. Take a small piece of Magnesium ribbon. Burn it on a flame of candle. Collect the ash and mix it with a small quantity of water and dissolve it. Test the dissolved mixture with blue and red litmus papers to decide whether it is a acid or a base.

Show this video if the activity can’t be performed- https://www.youtube.com/watch?v=m2i9jLPXprQ

(only upto 1:30 min)

4. Take a glass tumbler half-filled with water and add a teaspoonful of Copper Sulphate to it.Now add a few drops of Sulphuric Acid to the Copper Sulphate solution. Take some sample solution of it in another beaker and keep it aside. Add an Iron nail to the solution in the first beaker and keep it undisturbed for half an hour. Compare the color of the solution in which iron nail is dropped to that of sample solution kept aside. Show this video- https://www.youtube.com/watch?v=KmhD8BmEFIo

5. Take a teaspoon of vinegar (acetic acid) in a test tube and add a pinch of baking soda (Sodium bi Carbonate) to it. If you do not have vinegar, lemon juice can also be used. You observe bubbles coming out with a hissing sound. Pass this gas through freshly prepared Limewater (Calcium Hydroxide).

6. Take a small quantity of Camphor in a dish and place it . in the open air. Observe it after some time.

7. Take a big size test tube. Fill half with water. Add some sugar to it and stir. Keep adding sugar and stirring until saturation is attained. Then heat this sugar solution and add some more sugar to it while stirring continuously. Continue adding sugar till no more sugar can be dissolved in it. Now filter the solution and allow it cool for half an hour.

8. Take some water in a test tube and add urea to it.

Heat the test tube till all the urea dissolves.

Keep on adding more urea to it until no more can be dissolved. Let the solution cool down for sometime. Observe the test tube after about half an hour.

9. Take some hot, saturated solution of Copper sulphate in a test tube. Pour some of it in an evaporating dish. Allow the solution to cool quickly.

Observe with a magnifying glass, the size, colour and shape of the crystals formed.