Learn Class 8 Science - Chemical Effects of Electric Current

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

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 2

When the ends of metal wire are not connected to a battery:

A. electrons move from positive electrode to negative electrode

B. electrons move from negative electrode to positive electrode

C. electrons move in random directions

D. protons move in random direction in such a way that their net movement in a unit volume is zero

Question 3

An electrolyte:

A. has positive charge

B. has negative charge

C. should be able to conduct charge without dissociating

D. should be able to form positive and negative ions

Question 4

Insulators:

A. conduct electricity

B. do not conduct electricity

C. conduct electricity only at low temperatures

D. conduct electricity at room temperature

Question 5

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