Metals Notes, Quizzes & Revision
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MATERIALS — Subtopic: Metals
Subject: Pre-technical • Age: 12 (Kenya)
What are metals?
Metals are materials that are usually hard and shiny. They can be bent, pulled into wires or hammered into thin sheets. People use metals to make many things in Kenya such as nails, roofing sheets, cooking pots and electric wires.
Common metals you see in Kenya
Iron / Steel 🛠️
Used for nails, gates, rods, and building frames.
Used for nails, gates, rods, and building frames.
Aluminium 🥫
Used for cooking pots, soda cans, and some jikos (stoves).
Used for cooking pots, soda cans, and some jikos (stoves).
Copper 🔌
Used in electric wires and some plumbing.
Used in electric wires and some plumbing.
Tin 🪙
Often used as a thin coating on steel (tinplate) and in cans.
Often used as a thin coating on steel (tinplate) and in cans.
Simple properties of metals
- Shiny — Many metals look bright when polished.
- Hard — They can be strong, but some are soft (e.g., copper).
- Malleable — Can be hammered into thin sheets (e.g., aluminium foil).
- Ductile — Can be stretched into wires (e.g., copper wires).
- Conductors — Metals let heat and electricity pass through them (useful for pots and wires).
- Some are magnetic — Iron and steel can be pulled by a magnet. Not all metals are magnetic.
Uses of metals (everyday examples)
- Roofs and nails — corrugated iron sheets and steel nails for houses.
- Cooking — aluminium pots, stainless steel pans.
- Transport and building — steel frames and car parts.
- Electricity — copper wire in homes and phones.
- Coins and tools — small metal objects used daily.
Two simple class experiments
1. Test for magnetism 🧲
Materials: magnet, collection of objects (nail, aluminium foil, coin, paperclip).
Steps: Bring the magnet near each object. If the object moves toward the magnet, it is magnetic (likely iron or steel).
Observation: Nails and paperclips usually stick. Aluminium and coins do not.
Materials: magnet, collection of objects (nail, aluminium foil, coin, paperclip).
Steps: Bring the magnet near each object. If the object moves toward the magnet, it is magnetic (likely iron or steel).
Observation: Nails and paperclips usually stick. Aluminium and coins do not.
2. Test for electricity conduction 🔋💡
Materials: battery, small bulb, two short wires, metal object (e.g., spoon), insulating object (wood).
Steps: Make a simple circuit with the battery, bulb and wires. Insert the metal object in the circuit — if the bulb lights, the object conducts electricity. Try the wood — the bulb should not light.
Safety: Do this only with a low-voltage battery and with adult supervision.
Materials: battery, small bulb, two short wires, metal object (e.g., spoon), insulating object (wood).
Steps: Make a simple circuit with the battery, bulb and wires. Insert the metal object in the circuit — if the bulb lights, the object conducts electricity. Try the wood — the bulb should not light.
Safety: Do this only with a low-voltage battery and with adult supervision.
Safety and care
- Always ask an adult to help with experiments.
- Use gloves when handling rusty metal to avoid cuts and infections.
- Keep metal objects away from high heat unless they are cooking utensils.
- Recycle scrap metal — it saves materials and helps the environment.
Quick summary
Metals are materials that are strong, shiny, and good at conducting heat and electricity. Common metals in Kenya include iron, aluminium and copper. We use metals for buildings, cooking, tools and electricity.
Short quiz (check your learning)
- Give two examples of metals used in homes in Kenya.
- Which metal property lets us stretch a metal into wire?
- How can you test if a metal is magnetic?
Answers (click to show)
- Examples: iron/steel (nails, roofing) and aluminium (pots, cans).
- Being ductile lets a metal be pulled into wires.
- Use a magnet — if the magnet pulls the metal, it is magnetic.