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Lakhmir Singh Solutions Class 8 Science Chapter 14 – Chemical Effects of Electric Current

Lakhmir Singh Solutions Class 8 Science Chapter 14 – Chemical Effects of Electric Current from Class 8 Science explains how electric current can produce chemical changes when it passes through different substances. This chapter is important because it connects electricity with chemistry and helps students understand real-life applications like electroplating, purification of metals, and electrolysis.

Electric current is not just about light and heat; it also brings chemical changes in certain materials. When current flows through a conducting liquid, it may cause decomposition of the substance into simpler components. This process is known as electrolysis.

Download the PDF of Lakhmir Singh Solutions Class 8 Science Chapter 1 4

Understanding Conductors and Electrolytes

Materials that allow electric current to pass through them are called conductors. However, not all conductors behave the same way. Metals conduct electricity without undergoing any chemical change, but liquids like salt solution or acid solution behave differently.

Such liquids are called electrolytes because they allow current to pass and also undergo chemical changes. When electricity passes through an electrolyte, it breaks into ions which move towards electrodes. In Lakhmir Singh Solutions Class 8 Science Chapter 14, students learn the difference between conductors and electrolytes with clear examples and explanations that make learning easy.

Chemical Effects of Electric Current

When electric current passes through a conducting liquid, it can produce the following chemical effects:

• Formation of gas bubbles at electrodes
• Deposition of metals on electrodes
• Change in colour of the solution
• Formation of new substances

These changes show that electricity can cause chemical reactions. This is the basis of many industrial processes.

Electrolysis Process

Electrolysis is one of the most important topics in this chapter. It is the process in which an electric current is passed through an electrolyte to bring about a chemical change.

During electrolysis:

• Positive ions move towards the cathode (negative electrode)
• Negative ions move towards the anode (positive electrode)

This movement of ions leads to decomposition of the compound. For example, water can be broken into hydrogen and oxygen using electricity.

Electroplating – A Real-Life Application

Electroplating is the process of coating a metal with another metal using electricity. It is one of the most useful applications of chemical effects of electric current.

In electroplating:

• The object to be coated is made cathode
• The metal to be coated is made anode
• A salt solution of the coating metal is used as electrolyte

Common examples include gold-plated jewellery, chromium plating on car parts, and silver-coated utensils.

Electroplating helps in:

• Preventing rusting
• Improving appearance
• Increasing durability

This topic is explained in detail in Lakhmir Singh Solutions Class 8 Science Chapter 14 to help students understand practical applications.

You can also refer to structured chapter solutions here:
https://myclass24.com/lakhmir-singh-manjit-kaur-solutions/class-8-science
https://myclass24.com/lakhmir-singh-manjit-kaur-solutions

Conductivity of Liquids

Not all liquids conduct electricity. Pure water is a poor conductor, but when salt or acid is dissolved in it, it becomes a good conductor. This is because ions are formed in the solution which carry electric charge.

This concept is very important in understanding how chemical reactions occur during electrolysis. Students are often asked to identify good and bad conductors in exams.

Practical Experiments in This Chapter

This chapter includes simple experiments such as:

• Testing conductivity of liquids using a tester
• Observing bubbles formed during electrolysis
• Electroplating a metal object

These experiments help students connect theory with real-life observations.

Importance of Chemical Effects of Electric Current

This topic is not only important for exams but also for daily life. It helps in understanding:

• Metal purification
• Manufacturing processes
• Battery operation
• Industrial coating techniques

Without chemical effects of electric current, many modern technologies would not exist.

Summary of Key Concepts

• Electric current can cause chemical changes
• Electrolytes conduct electricity and undergo decomposition
• Electrolysis separates compounds into ions
• Electroplating is used to coat metals
• Conductivity depends on presence of ions

These concepts are explained step-by-step in Lakhmir Singh Solutions Class 8 Science Chapter 14 to make learning simple and effective.