Important Questions: Chemical Effects of Electric Current for Class 8 Science

In an electrolyte, the movement of charge carriers is essential for conducting electricity. Let's break down the roles of different particles in this context

1. Understanding Electrolytes: Electrolytes are substances that dissociate into ions when dissolved in a solvent, typically water. This dissociation allows the solution to conduct electricity
2. Identifying Charge Carriers: The charge carriers in an electrolyte are primarily ions. Ions are atoms or molecules that have gained or lost one or more electrons, resulting in a net electrical charge
3. Role of Different Particles

• Electrons: While electrons are charge carriers in metallic conductors, they do not move freely in electrolytic solutions
• Protons: Protons are positively charged but are not mobile in solutions; they are found in the nucleus of atoms
• Neutrons: Neutrons are neutral particles and do not carry any charge, hence they cannot act as charge carriers
• Ions: Ions, which can be either positively charged (cations) or negatively charged (anions), are the primary carriers of charge in electrolytes. Their movement allows for the flow of electric current through the solution

Therefore, in an electrolyte, the correct answer is that ions act as the carriers of charge

The correct answer is Wood.

Key Points

Insulator:

• The insulator is a material that resists the flow of current.
• It also doesn't allow the flow of heat to pass through them.
• It doesn't have free electrons that the reason for its non-conducting nature.
• They have high resistivity.
• Insulators are protectors.
• Example: Glass (highest resistivity), wood, rubber, clothes, mica, quartz.
• Applications:
  • Thermal Insulators: Resist the follow of heat. So we can use it in thermoplastic bottles, ceiling and roofs. 
  • Electrical Insulators: Resist the follow of current. So we can use it in an electrical circuit, cables, high voltage system, safety equipment.
  • Sound Insulators: Hinder the sounds and easily absorbs them. So we can use it in the conference hall, buildings.

Important Points

Conductor:

• The conductor is a material that allows the flow of current through them.
• It also allows the flow of heat to pass through them.
• They conduct electricity because they allow the electron to pass through them. 
• They also have free electron on their surface which allow electricity to pass through them.
• Example: Metals (Silver is the best conductor of electricity), humans, animals, Earth.