Physics - Senior Secondary 2 - Electric Field - Electrical Conduction through Liquids (Electrolysis)

Electric Field - Electrical Conduction through Liquids (Electrolysis)

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TERM: 3RD TERM

WEEK 1

Class: Senior Secondary School 2
Age: 16 years
Duration: 40 minutes for each of 5 periods
Date:
Subject: Physics
Topic: Electric Field – Electrical Conduction through Liquids (Electrolysis)
Subtopics:
• Electrolytes and non-electrolytes
• Dynamics of charged particles (ions) in electrolytes
• Voltameter
• Examples of electrolysis

SPECIFIC OBJECTIVES:
By the end of the lesson, students should be able to:

  1. Differentiate between electrolytes and non-electrolytes.
  2. Explain the dynamics of charged particles in electrolytes.
  3. Understand the operation of a voltameter.
  4. Identify real-life examples of electrolysis.

INSTRUCTIONAL TECHNIQUES:
• Explanation
• Demonstration
• Questions and answers
• Hands-on activity: Setting up a simple electrolysis experiment
• Video clips on electrolysis and its applications

INSTRUCTIONAL MATERIALS:
• Electrolytes and non-electrolytes (salt solution, distilled water)
• Voltameter
• Power source
• Electrodes
• Physics textbook
• Whiteboard markers
• Videos on electrolysis

INSTRUCTIONAL PROCEDURES
PERIOD 1-5

PRESENTATION
STEP 1: INTRODUCTION
• The teacher will ask students to identify substances that conduct electricity and those that do not.
• Students will be guided to understand that electrical conduction depends on the presence of free-moving charged particles (ions).

STEP 2: EXPLANATION
• The teacher explains the difference between electrolytes (substances that conduct electricity in solution) and non-electrolytes (substances that do not).
• Discuss the dynamics of ions in electrolytes (positive ions moving towards the cathode and negative ions moving towards the anode).

STEP 3: DEMONSTRATION
• The teacher demonstrates electrolysis using a simple setup with water, salt, and two electrodes.
• The students will observe the effects of electrolysis, such as gas bubbles at the cathode and anode.

STEP 4: EXAMPLES OF ELECTROLYSIS
• The teacher discusses common examples of electrolysis: electroplating, electrolysis of water, and the extraction of metals.
• Real-life applications are linked to the chemical processes involved.

STEP 5: HANDS-ON ACTIVITY
• Students set up a basic electrolysis experiment using a voltameter. They observe the effects of electrolysis and record their findings.

STEP 6: NOTE TAKING
• The teacher writes summary notes on the board for students to copy.
NOTE:

  • Electrolytes: Substances that dissociate into ions when dissolved in water and conduct electricity. Examples: NaCl, H₂SO₄.
  • Non-electrolytes: Substances that do not dissociate into ions and do not conduct electricity. Examples: sugar, distilled water.
  • Voltameter: A device used to measure the quantity of electricity passed during electrolysis.
  • Electrolysis Examples: Electroplating, extraction of metals (aluminum), electrolysis of water (splitting water into hydrogen and oxygen).

EVALUATION

  1. Define electrolytes and non-electrolytes.
  2. Explain the process of electrolysis.
  3. How does a voltameter function?
  4. Provide two examples of electrolysis.
    CLASSWORK:
    Describe the dynamics of charged particles in electrolytes.
    • Research one real-life application of electrolysis.

CONCLUSION
• The teacher will review the answers with the students and provide feedback.
• Students are encouraged to reflect on the importance of electrolysis in daily life.