Learn Class 8 Science - Chemical Effects of Electric Current

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What are metals? And what are the electric effects of current? We all are aware that metal is a good conductor of electricity. At the same time, plastics are not the conductors of electricity. There are also many liquid conductors which become a source of electricity.

Electric current

  • The path consists of passing or taking current.
  • And the current flows in it even when the current’s path is closed.
  • Where the break-in path leads to no formation of current.

Chemical effects of electric current

The chemical reactions can occur when the current gets passed through the chemical solutions. It consists of:

  • Colour changes.
  • Metal Deposition
  • Gas bubbles form.

How to check current?

Many ways can help you to check current. These are:

1. Conductor:

  • The term ‘conductor’ refers to the tool which allows it to pass the current.

2. Tester:

  • A tester is a tool that helps to check the electric current.
  • In the tester, there is a presence of a led bulb.
  • The LED bulb will help you to determine the current.

Electrodes:

Two types:

  • Cathode
  • In the tester, there is a presence of a led bulb.
  • Anode

Electroplating:

Electroplating is the process of the deposition of layers. And this layer gets on the other material with the help of electroplating.

Chemical Effects of Electric Current Sample Questions for Class 8

Question 1

When an electron moves from negative electrode to positive electrode:
A. negative charge moves from negative electrode to positive electrode
B. positive charge moves from positive electrode to negative electrode
C. no charge flows from either electrode to other electrode
D. Both negative charge moves from negative electrode to positive electrode and positive charge moves from positive electrode to negative electrode

Question 2

In a cell, electrons move from:
A. positive electrode to negative electrode
B. negative electrode to positive electrode
C. positive electrode to negative electrodeB. negative electrode to positive electrode
D. positive electrode to negative electrodeB. negative electrode to positive electrodeC. Both positive electrode to negative electrode and negative electrode to positive electrode

Question 3

Which of the following statement/s is/ are true?
A. During electrolysis, charge flows through electrolyte solution via electrons
B. The randomly moving electrons in a metal wire will start moving in a particular direction when a potential difference is applied across it
C. A negatively charged particle has higher electric potential than a positively charged particle
D. Charge flows only through negative charge carriers like electrons

Question 4

Chemical Effects of Electric Current Worksheet-1 Chemical Effects of Electric Current Worksheet-1 Current is the flow of:
A. Matter
B. Electrons
C. Protons
D. Charge

Question 5

Chemical Effects of Electric Current Worksheet-5 Chemical Effects of Electric Current Worksheet-5 Electroplating is based on
A. Magnetic effect of electricity
B. Chemical effect of electricity
C. Heating effect of electricity
D. Physical effect of electricity