APSB - 7 - Science :: Changes around us
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[Author - Anu Nived]
Objective: To teach the students about various physical and chemical changes that happen around us
Subtopics to be covered:
- Difference between physical change and chemical change
- Crystallisation
- Galvanisation
Learning Outcome:
- Students can classify the processes into physical and chemical changes happening around them
- They know how iron rusts and how to prevent browning of cut vegetables and fruits
[Author - Kripa S]
http://scert.telangana.gov.in/sites/default/files/publication/ebooks/7TM_GENSC.pdf#page=189 (Telangana Board) (Telugu Medium)
http://apscert.gov.in/ebookapp/GeneratePdf (AP Board) (Telugu Medium)
http://scert.telangana.gov.in/sites/default/files/publication/ebooks/7EM_GENSC.pdf#page=171 (Telangana Board) (English Medium)
http://apscert.gov.in/ebookapp/GeneratePdf (AP Board) (English Medium)
[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)
[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?
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