Wednesday, November 29, 2017

CBSE CLASS 8 - SCIENCE - CHEMICAL EFFECTS OF ELECTRIC CURRENT (WORKSHEET) (#eduvictors)(#cbseNotes)

CHEMICAL EFFECTS OF ELECTRIC CURRENT (WORKSHEET)

CBSE CLASS 8 - SCIENCE - CHEMICAL EFFECTS OF ELECTRIC CURRENT (WORKSHEET) (#eduvictors)(#cbseNotes)


Here a few definitions are written. Identify the term these sentences define.


1. A substance which gives ions when melted or dissolved in water is called a/an __________.


2. Sodium Hydroxide, common salt, sulphuric acid are examples of ___________.


3. Sugar, Urea, Benzene Ethyl alcohol are examples of ____________.


4. Materials which allow electricity to pass through them are called __________.


5. Metals are generally _________ of electricity.




6. Non-metals are generally __________ of electricity, ________ being an exception.


7. The positive charged ion is called _______


8. A negative charged ion is called ________.


9. In an electroytic cell, anode is ________ electrode and it collects __________.


10. In an electroytic cell, cathode is ________ electrode and it collects __________.


11. Full form of LED is _____________. It has two leads. Longer lead is ______ and the shorter one is ________.


12. The phenomenon of causing chemical changes by passing electricity through a conducting solution is called ______________________________.


13. The process of decomposition of an electrolyte on passing electric current is called ____________.

14. When an acidified water is electrolysed, it decomposes into _________________.


15. The process of depositing a thin layer of any superior metal over an object of a cheaper metal, with the help of electric current is called ______________.

It is done in industries to have an ___________ coating on the parts of machines so that they do not react with the raw material, to have an _________ coating for the machines so that they do not get corroded, and a __________ coating for parts like boilers to resist the heat produced by the machinery.










Answers:
1. electrolyte
2. electrolytes/conductors
3. non-electrolytes/poor conductors
4. conductors.
5. good conductors
6. bad conductors, graphite
7. cation
8. anion
9. positive, anions
10. negative, cations
11. Light emitting diode, positive and negative
12. chemical effect of current
13. electrolysis.
14. H2 and O2 gases.
15. electroplating, anti-reactive, anti-corrosive, heat-resistive 

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