Class 8 - Science
Chapter 13 - Chemical Effect of Electric Current
(Worksheet)
1. Static electricity was first observed by _________, a Greek scientist, more than 2500 years ago.
2. is the process in which an electric current is passed through a liquid, causing a chemical reaction to take place.
3. Most liquids that conduct electricity are solutions of _______, _______ and ______________.
4. When electricity is passed through tap water, the gases ________ and ______are evolved.
5. Small amount of a mineral salt present naturally in water makes it a __________ of electricity.
6. Pure water is a/an __________ but ________ electricity when salt is added to it.
7. The longer lead of LED is always connected to the __________ terminal of the battery.
8. The object to be electroplated is taken as ____________ electrode.
9. The process of depositing a layer of any desired metal on another material by means of electricity is called ____________.
10. The negative electrode is called ________ and the positive elctrode is called _________.
11. A negative charged ion is called _________.
12. Electroplating of ___________ is done on objects like water taps and cycle bell to give them a shiny appearance.
13. Full form of LED is _____________________.
14. Iron is galvanised by coating with _________.
15. The substance for ions when dissolved in water and conducts electricity is called a/an _________.
Answer:
1: Thales
2: Electrolysis
3: acids, bases, salts
4: Hydrogen, Oxygen
5: good conductor
6: insulator (poor conductor), conducts
7: positive
8: negative
9: electroplating
10: Cathode, Anode
11: anion
12: chromium
13: Light Emitting Diode
14: zinc
15: electrolyte
☛See also:
Ch 14 - Chemical Effects of Electric Current (NCERT Solutions)
Ch 14 - Chemical Effects of Electric Current (MCQs)
Ch 14 - Chemical Effects of Electric Current (Q & A)
