Lesson Notes By Weeks and Term - Junior Secondary 1

TERM – 1^ST TERM

WEEK EIGHT

Class: Junior Secondary School 1

Age: 12 years

Duration: 40 minutes of 5 periods each

Date:

Subject: BASIC TECHNOLOGY

Topic: CLASSIFICATION OF METALS

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

1. Classify metals
2. Identify the forms of Metals
3. Identify the uses of metals.

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers,

demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures, metal materials.

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

NOTE

CLASSIFICATION OF METALS

Metals can be classified in various ways based on different criteria. The following are  common classifications:

1. Chemical Composition:

   - Ferrous Metals: Contain iron as a primary constituent (e.g., iron and steel).

   - Non-Ferrous Metals: Do not contain iron as the primary constituent (e.g., aluminum, copper, and brass).

2. Density:

   - Heavy Metals: Have high densities, such as lead and mercury.

   - Light Metals: Have lower densities, including aluminum and magnesium.

3. Usage:

   - Base Metals: Common and widely used metals like copper, zinc, and nickel.

   - Precious Metals: Baluable and often rare metals like gold, silver, and platinum.

4. Magnetic Properties:

   - Ferromagnetic Metals: Display magnetic properties, like iron and nickel.

   - Non-Ferromagnetic Metals: Do not exhibit strong magnetic properties, such as aluminum and copper.

Forms of metals

Metals can exist in various forms, each tailored to specific applications. Here are common forms of metals:

1. Alloys - Combinations of two or more metals or a metal with non-metal elements. Examples include steel, bronze, and brass.
2. Metal Sheets and Plates - Flat, thin pieces of metal often used in construction, manufacturing, and fabrication.
3. Metal Bars - Solid, elongated pieces of metal with various cross-sectional shapes. Used in construction and as structural elements.
4. Metal Wires- Long, thin strands of metal used for electrical wiring, fencing, and various applications.
5. Metal Tubes and Pipes- Hollow structures often used in plumbing, construction, and industrial processes.

Uses of metals

Metals have a wide range of uses across various industries due to their unique properties. Here are some common applications:

1. Construction - Steel and aluminum are widely used in construction for structural components, framing, and roofing.
2. Transportation - Metals such as steel, aluminum, and copper are essential in the manufacturing of vehicles, aircraft, and ships.
3. Energy - Metals like copper and aluminum are used in electrical conductors, and steel is crucial for the construction of power plants.
4. Manufacturing - Metals play a vital role in manufacturing machinery, tools, and equipment for various industries.
5. Jewelry and Currency - Precious metals like gold, silver, and platinum are used for making jewelry and coins.
6. Infrastructure - Metals are essential in the construction of bridges, pipelines, and other critical infrastructure.

EVALUATION: 1. Classify metals based on their magnetic properties.

2. Mention 5 forms which metals come in.
3. Identify 5 uses of metals that you know.

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively