NCERT - 8 - Science :: Chemical Effects of Electric Current

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[Contributor - Anu Nived]

Objective: To teach the students about the chemical effects of electric current

Subtopics to be covered:

1. To test whether liquids conduct electricity
2. Electroplating

Learning Outcome:

1. Students know that some liquids are good conductors of electricity while some are bad.
2. They know about the chemical effects of currents

[Contributor - Kripa S]

http://epathshala.nic.in/wp-content/doc/book/flipbook/ClassVIIIFlipbook/0855-Vigyan/Chapter-14/index.html (NCERT Hindi Medium)

http://epathshala.nic.in/wp-content/doc/book/flipbook/ClassVIIIFlipbook/0854-Science/Chapter-14/index.html (NCERT English Medium)

https://drive.google.com/open?id=0BzNF2YyqQxJ-eEQzaV9pMFhzcVU (JEPC Board) (Hindi Medium)

[Contributor - Kripa S]

(Source - Bodhaguru) https://www.youtube.com/watch?v=KMKjUqf50PU (Hindi -what is electricity)

(Source -Smart Learning for All ) https://www.youtube.com/watch?v=QZPURSF5iH4 (English - electric conductivity)

[Contributor - Anu Nived]

http://www.ekshiksha.org.in/images_chemical_effects_VIII/figure_2.JPG (chemical effects of electric current example 1)

http://2.bp.blogspot.com/-mdaj8l9qz70/UWKdtYALGlI/AAAAAAAACRA/oI5QH9oZpxE/s1600/CBSE_CLASS_8th_SCIENCE_Chapter_14_CHEMICAL_EFFECTS_OF_ELECTRIC_CURRENT.jpg (purification of copper)

https://s-media-cache-ak0.pinimg.com/originals/d8/22/51/d822512387a817ddcafb66f5bb95235c.jpg (electroplating)

[Contributor - Kripa S]

1. Take about two teaspoonfuls of distilled water in a clean and dry plastic or rubber cap of a bottle. (You may obtain distilled water from your school science lab. You may also get distilled water from a medical store or a doctor or a nurse). Use the tester to test whether distilled water conducts electricity or not. What do you find? Does distilled water conduct electricity? Now dissolve a pinch of common salt in distilled water. Again test. What do you conclude this time?

2. Test the conduction of electricity through various fruits and vegetables. Display your result in a tabular form.

[Contributor - Tejashri Khadilkar]

https://drive.google.com/open?id=0B4m07xnDF8JpNldlUlI2SXEtUE0 (Ans Key 1)

https://drive.google.com/open?id=0B4m07xnDF8JpeHN0S2dJelZoRlk (Ans Key 2)

[Contributor - Tejashri Khadilkar]

https://drive.google.com/open?id=0B4m07xnDF8JpWElyVk1Fa2xIcU0 (Worksheet 1)

https://drive.google.com/open?id=0B4m07xnDF8JpZ3MtZHlHTGNURDQ (Worksheet 2)

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