MHSB - 7 - Science :: Substances we use

MSCERT-Science-Grade 7

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[Contributor - Anu Nived]

Objective: To teach the students about various materials that we use in our daily life

Subtopics to be covered:

Detergents
Production of Cement

Learning Outcome:

Students know the composition of toothpaste
They know how detergents acts on our soiled clothes
They know what is concrete and where is it used

[Contributor - Kripa S]

http://cart.ebalbharati.in/BalBooks/pdfs/701020012.pdf#page=109 (Marathi)

http://cart.ebalbharati.in/BalBooks/pdfs/703020012.pdf#page=109 (English)

[Contributor - Kripa S]

https://www.youtube.com/watch?v=q-Bx1dZwU_0 (use of plastics)

[Contributor - Kripa S]

https://s-media-cache-ak0.pinimg.com/736x/78/8c/14/788c142df9c5e192d984b15f303e6cb3.jpg (natural vs manmade resources)

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTKqPBIoXoAKrKZQlMG9XoIh7WyTSUxhoE4jMk08ssA13fpSGZNMQ (synthetic fibres)

[Contributor - Kripa S]

1. Enlist a set of items you use everyday. Distinguish how many of them are naturally made and how many are man made. Is there a way to switch from man made item to a natural item ? Discuss

[Contributor - Samanta Ranade]

https://drive.google.com/open?id=1Yey-gos40mq1-Oj-kM2EmcWKg3-HM2L-

[Contributor - Shahnawaz Pathan]

Term	Transliterated Term	Translated Term
Detergent	डिटर्जंट	अपमार्जक
Shake	शेक	हलविणे
Floating	फ्लोटिंग	तरंगणे
Solution	सोलूशन	द्रावण
Mixture	मिक्शर	मिश्रण
Homogeneous	होमोजिनिअस	एकजीव
Milky	मिल्की	दुधाळ
Molecules	मोलिक्यूल्स	रेणू
Property	प्रोपर्टी	गुणधर्म
Surface Activity	सर्फेस अ‍ॅक्टिव्हिटी	पृष्ठसक्रियता
Surfactant	सर्फेक्टंट	पृष्ठसक्रिय
Lather Formation	लॅदर फॉर्मेशन	फेस होणे
Natural Detergent	नॅचरल डिटर्जंट	निसर्गनिर्मित अपमार्जक
Animal fat	अॅनिमल फॅट	प्राण्यांची चरबी
Scum	स्कम	साका
Raw material	रॉ मटिरियल	कच्चा माल
Beaker	बीकर	चंचू पात्र
Glass rod	ग्लास रॉड	काच कांडी
Tripod	ट्रायपॉड	तिवई
Dissolve	डिसॉल्व	विरघळविणे
Stir	स्टर	ढवळणे
Thick	थिक	घट्ट
Perfume	परफ्यूम	सुवासिक द्रव्य
Ash	अॅश	राख
Durable	ड्युरेबल	टिकाऊ