Topic: Metallic Bonding
Lesson 1: Metallic Bonding
| Section | Details |
|---|---|
| Objective | Describe metallic bonding as the electrostatic attraction between positive ions in a giant metallic lattice and a ‘sea’ of delocalized electrons. |
| Activities | – Starter (5 mins): Show an image or animation of a metallic lattice and ask: “What keeps metals together?” – Main (25 mins): 1. Define metallic bonding as electrostatic attraction between positive ions and delocalized electrons. 2. Explain the arrangement of positive ions in a regular lattice surrounded by a ‘sea’ of delocalized electrons. 3. Use diagrams or models to illustrate the structure of metallic bonding. – Plenary (10 mins): Students label a diagram of metallic bonding and explain why metals are conductive. |
| Resources | Metallic bonding diagrams, animations/videos, whiteboard for drawing structures. |
| Time | 40 minutes total: 5 mins (Starter) + 25 mins (Main) + 10 mins (Plenary). |
| Homework | Write a paragraph explaining metallic bonding with a labeled diagram. |
| Assessment | Worksheet: Label diagrams of metallic bonding and describe the forces holding metals together. |
| Past Paper Practice | IGCSE Chemistry 0620/41/M/J/20 Q5(a) – Describing metallic bonding and its structure. |
Lesson 2: Properties of Metals – Electrical Conductivity
| Section | Details |
|---|---|
| Objective | Explain, in terms of structure and bonding, why metals are good conductors of electricity. |
| Activities | – Starter (5 mins): Demonstration: Use a circuit to show metals conducting electricity. Ask: “Why does this happen?” – Main (25 mins): 1. Explain how delocalized electrons in metals allow electricity to flow. 2. Compare metals with non-conductors (e.g., rubber) to highlight the role of free electrons. – Plenary (10 mins): Students explain electrical conductivity in metals using diagrams and written descriptions. |
| Resources | Circuit setup with metal wires, diagrams of delocalized electrons. |
| Time | 40 minutes total: 5 mins (Starter) + 25 mins (Main) + 10 mins (Plenary). |
| Homework | Research why some metals conduct electricity better than others (e.g., copper vs. iron). |
| Assessment | Quiz: Explain why metals conduct electricity but non-metals do not. |
| Past Paper Practice | IGCSE Chemistry 0620/41/O/N/21 Q5(b) – Explaining the electrical conductivity of metals. |
Lesson 3: Properties of Metals – Malleability and Ductility
| Section | Details |
|---|---|
| Objective | Explain, in terms of structure and bonding, why metals are malleable and ductile. |
| Activities | – Starter (5 mins): Bend a piece of wire to show malleability and ductility. Ask: “Why can metals be reshaped without breaking?” – Main (25 mins): 1. Explain how the layers of ions in a metallic lattice can slide over each other without breaking bonds due to the delocalized electrons. 2. Use diagrams to illustrate the sliding of layers in metals. 3. Relate malleability and ductility to the uses of metals (e.g., wires, sheets). – Plenary (10 mins): Group activity: Students summarize why metals are malleable and ductile in a short paragraph. |
| Resources | Metal samples (e.g., wire, aluminum foil), diagrams of metallic lattices. |
| Time | 40 minutes total: 5 mins (Starter) + 25 mins (Main) + 10 mins (Plenary). |
| Homework | Write a short report on how the structure of metals makes them useful for construction or electrical wiring. |
| Assessment | Worksheet: Describe why metals are malleable and ductile in terms of metallic bonding. |
| Past Paper Practice | IGCSE Chemistry 0620/41/M/J/19 Q5(a) – Explaining malleability and ductility in metals. |
Notes for Teachers:
- Use demonstrations and real-life examples to connect metallic bonding concepts with practical applications.
- Encourage students to explain properties using diagrams to strengthen their understanding.
- Highlight comparisons between metals and non-metals to clarify the unique properties of metallic bonding.
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