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Lesson 13: Properties of Elements Physical properties (colour, state, density) Conductivity (electrical & thermal) Magnetic properties
Year 8 • Chemistry
Lesson 13: Properties of Elements
In this lesson, students explore the physical properties of elements, including colour, state, density, conductivity, and magnetic behaviour, and learn how these properties help us identify and use elements.
Lesson Objectives
- Identify physical properties of elements.
- Describe electrical and thermal conductivity.
- Recognise magnetic elements.
- Explain how properties affect uses.
1. Physical Properties of Elements
Physical properties are features we can observe or measure without changing the substance.
[ Image Placeholder – Physical Properties Examples ]
Examples of physical properties:
• Colour (gold is yellow, copper is reddish-brown)
• State (solid, liquid, gas at room temperature)
• Density (how heavy something is for its size)
• Colour (gold is yellow, copper is reddish-brown)
• State (solid, liquid, gas at room temperature)
• Density (how heavy something is for its size)
Real-life link:
Aluminium is light (low density), so it is used in aircraft.
2. Conductivity of Elements
Conductivity describes how well an element allows electricity or heat to pass through it.
[ Image Placeholder – Electrical and Thermal Conductivity ]
Electrical conductivity:
• Metals like copper conduct electricity well
• Metals like copper conduct electricity well
Thermal conductivity:
• Metals transfer heat quickly
• Used in cooking pans and radiators
Non-metals usually do not conduct electricity or heat well.
3. Magnetic Properties of Elements
Some elements show magnetic properties, meaning they are attracted to magnets.
[ Image Placeholder – Magnetic Elements ]
Magnetic elements include:
• Iron
• Nickel
• Cobalt
• Iron
• Nickel
• Cobalt
Real-life link:
Iron is used in motors and generators because it is magnetic.
4. Using Properties to Identify Elements
Scientists identify elements by testing their properties.
[ Image Placeholder – Testing Properties ]
Identification clues:
• Conducts electricity → likely a metal
• Magnetic → likely iron, nickel, or cobalt
• Low density → likely aluminium
• Conducts electricity → likely a metal
• Magnetic → likely iron, nickel, or cobalt
• Low density → likely aluminium
Practice Questions
A. Fill in the Blanks
- Physical properties can be observed without __________ the substance.
- Density describes how __________ something is for its size.
- Copper is a good __________ conductor.
- Iron is attracted to __________.
- Aluminium has a __________ density.
B. True or False
- Colour is a physical property.
- All elements are magnetic.
- Metals usually conduct electricity.
- Non-metals are good heat conductors.
- Iron is magnetic.
C. Short Answer
- What is a physical property?
- Give two examples of physical properties.
- Why is copper used for electrical wires?
- Name one magnetic element.
- Why is aluminium used in aircraft?
✅ Show Answer Key
A. Fill in the Blanks
- changing
- heavy
- electrical
- magnets
- low
B. True or False
- True
- False
- True
- False
- True
C. Short Answer
- A property that can be observed without changing the substance.
- Colour, state, density (any two).
- Because it conducts electricity well.
- Iron / Nickel / Cobalt.
- Because it is light but strong.
© Aviate Learning – Properties of Elements (Year 8)
⚡ Interactive Conductivity Tester
Choose a material and test whether it conducts electricity or heat.
Think about whether the material is a metal or non-metal.
Click a test button to see the result.