This lesson explains the effect electric current has on chemicals, and the processes of electrolysis and electroplating
Introduction to CBSE Class 8 Science Chapter "Chemical Effects of Electric Current"
The chapter “Chemical Effects of Electric Current” explores the remarkable effects that an electric current can have on chemical substances. Students learn about the process of electrolysis, where an electric current causes a chemical reaction when it passes through a liquid. The chapter explains the conductivity of liquids, identifying which substances allow electric current to pass and why some do not.
It delves into the practical applications of these chemical effects, such as electroplating, which is used to coat the surfaces of metal objects with a thin layer of a different metal. The chapter also discusses the precautions necessary to conduct these experiments safely and the environmental implications of such chemical processes. Students are encouraged to understand the underlying principles of these chemical effects and their relevance in everyday life, from the batteries powering their gadgets to the treatment of water to make it safe for drinking.
Assignments for CBSE Class 8 Science Chapter “Chemical Effects of Electric Current”
- Conductivity Test: Experiment with different liquids at home to test their conductivity using a simple circuit.
- Research on Electroplating: Write a short project on the process of electroplating and its industrial applications.
- Model Making: Create a model of an electrolytic cell and explain its working principle.
- Case Study: Study the process of water purification and how electric current is used to make water potable.
- Debate: Discuss the environmental impacts of electroplating and how to mitigate negative effects.
Conclusion
“Chemical Effects of Electric Current” is a compelling chapter that showcases the power of electricity beyond lighting bulbs and powering motors—it’s a tool that leads to tangible chemical transformations. This chapter not only broadens students’ understanding of science but also ignites curiosity about how scientific principles are applied in technology and industry.
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Questions and Answers for CBSE Class 8 Science Chapter "Chemical Effects of Electric Current"
- Q1: What is electrolysis?
ANS: Electrolysis is a chemical process where an electric current is passed through a liquid, causing chemical reactions that lead to the breakdown of the substances in that liquid. - Q2: Why do some liquids conduct electricity while others do not?
ANS: Liquids that contain ions conduct electricity because ions are charged particles that move towards opposite electrodes, creating a flow of electric current. - Q3: What is electroplating and why is it used?
ANS: Electroplating is the process of coating an object with a layer of a different metal using electricity. It is used to prevent corrosion, improve appearance, or give a hard surface to the object. - Q4: Can all liquids conduct electricity?
ANS: Not all liquids can conduct electricity; only those that have free ions, like saltwater, can conduct electricity. - Q5: What safety precautions should be taken while performing experiments with electric current?
ANS: While performing such experiments, one should use low voltages, avoid the use of liquids near mains electricity, and never touch the apparatus with wet hands to prevent electric shocks. - Q6: How is the chemical effect of electric current utilized in water purification?
ANS: In water purification, electric current is used to kill bacteria and other germs through a process called electrolysis, ensuring the water is safe for drinking. - Q7: What materials are commonly used in electroplating?
ANS: Metals like copper, silver, gold, nickel, and chromium are commonly used in electroplating. - Q8: What role do batteries play in the chemical effects of electric current?
ANS: Batteries convert chemical energy into electrical energy, and the reactions within the battery involve the movement of ions, which is a chemical effect of electric current. - Q9: How does electroplating benefit industries?
ANS: Electroplating benefits industries by providing a cost-effective way to coat metals for increased durability, better electrical conductivity, resistance to corrosion, and aesthetic appeal. - Q10: Why is it important for students to learn about the chemical effects of electric current?
ANS: Understanding the chemical effects of electric current helps students grasp how fundamental scientific principles can be applied in practical and industrial contexts, fostering innovation and responsible use of resources.
