MHSB - 8 - Science :: Properties of substances

MSCERT-Science-Grade 8

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[Contributor - Anu Nived]

Objective: To teach the students about melting point, boiling point and distillation

Subtopics to be covered:

1. Distillation and fractional distillation

Learning Outcome:

1. Students know that each substance has a specific melting and boiling point
2. They know the process of distillation and fractional distillation

[Contributor - Kripa S]

http://cart.ebalbharati.in/BalBooks/pdfs/801010012.pdf#page=126 (Marathi Medium)

http://cart.ebalbharati.in/BalBooks/pdfs/803010012.pdf#page=126 (English Medium)

[Contributor - Kripa S]

https://www.youtube.com/watch?v=g8fQaiqETEQ (reduce boiling point of water)

[Contributor - Kripa]

http://www.okclipart.com/img167/mdvvzvcudcifgbttsmql.jpg (condensation)

http://media.istockphoto.com/vectors/boiling-kettle-vector-id479397621?k=6&m=479397621&s=170667a&w=0&h=otRP_0pFzU7UVmdtPHqDLi0ajdMZHzaUhYlHzHwxb3g= (evaporation)

http://comps.canstockphoto.com/can-stock-photo_csp38108454.jpg (boiling)

http://www.periodni.com/gallery/distillation.png (distillation apparatus)

[Contributor - Swathi Raman]

One way to separate salt and water at home is to boil the salt water in a pot with a lid. Ask any one of the students to bring boiled water (water boiled with salt) to school. Later, once the water is cooled, offset the lid slightly so that the water that condenses on the inside of the lid will run down the side to be collected in a separate container. This is the distilled water. When all of the water has boiled off, the salt will remain in the pot. This happens because salt has a much higher boiling point than water. (Please explain to them that method of evaporation can also be used for separating salt and water just that it works at a slower rate)

[Contributor - Priya Kashid]

https://drive.google.com/open?id=1rNAwlrcWET9MVQYUtLla4SQvsjlq58CK

[Contributor - Shahnawaz Pathan]

Term	Transliterated Term	Translated Term
Solid	सॉलिड	स्थायू
Liquid	लिक्विड	द्रव
Gas	गॅस	वायू
States of matter	स्टेट्स आॅफ मॅटर	पदार्थांच्या अवस्था
Candle	कँडल	मेणबत्ती
Wax	वॅक्स	मेण
Freezing	फ्रीजिंग	गोठणे
Vaporization	वेपोरायजेशन	बाष्पीभवन
Condensation	कंडेंसेशन	संघनन
Boiling	बोइलिंग	उकळणे
Melting Point	मेल्टिंग पॉइंट	द्रवणांक
Boiling Point	बोइलिंग पाॅइंट	उत्कलनांक
Evaporation	इवॅपोरेशन	बाष्पीभवन
Napthalene balls	नेप्थॅलिन बॉल्स	डांबराचे गोळे
Distillation	डिस्टिलेशन	ऊर्ध्वपतन
Thermometer	थर्मामीटर	तापमापी
Glass tube	ग्लास ट्यूब	काचेची नळी
Fractional Distillation	फ्रॅक्शनल डिस्टिलेशन	प्रभाजी ऊर्ध्वपातन
Solvent	सॉल्वंट	द्राव्य
Solute	सोल्यूट	द्रावक

[Contributor - Priya Kashid]

https://drive.google.com/open?id=1PX1tu6viMDPbxaj6iABT0m71rmM0M1b0

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