SS2 Chemistry 3rd Term Lesson Notes
SS2 Chemistry Third Term Detailed Lesson Notes
| Week | Topic |
| 1-2 | Resumption test / Water |
| 3-4 | Solubility |
| 5 | Mass, Volume, Electrolysis |
| 6 | Volumetric / Quantitative Analysis |
| 7 | Mid-Term Break |
| 8 | Hydrocarbons |
| 9 | Saturated Hydrocarbons – Alkanes |
| 10 | Unsaturated Hydrocarbons – Alkenes and Alkynes |
| 11 | Alcohols |
| 12 | Revisions |
| 13 | Examination |
SS2 Chemistry Third Term Detailed Lesson Notes
Week 1-2: Resumption Test / Water
Topic: Water
Lesson Objectives:
- Understand the structure and properties of water.
- Identify sources and types of water.
- Explain hardness of water and methods of softening.
- Describe the purification of water.
- Conduct tests for the presence of water.
SS2 Chemistry 3rd Term Lesson Notes
Content:
- Structure of Water:
- Chemical formula: H2O.
- Molecular structure: Angular or V-shaped with a bond angle of 104.5°.
- Polar molecule due to uneven distribution of electrons.
- Sources of Water:
- Natural sources: Rain, rivers, lakes, oceans, wells, springs.
- Underground sources: Boreholes, aquifers.
- Types of Water:
- Soft water: Lathers easily with soap (e.g., rainwater).
- Hard water: Does not lather easily due to presence of calcium or magnesium salts.
- Hardness of Water:
- Temporary hardness: Caused by bicarbonates; removed by boiling.
- Permanent hardness: Caused by sulfates or chlorides; removed by:
- Ion exchange resins
- Addition of washing soda
- Distillation
- Purification of Water:
- Filtration: Removes suspended particles.
- Sedimentation: Settles heavy particles.
- Chlorination: Kills bacteria.
- Distillation: Complete purification.
- Tests for Water:
- Anhydrous copper(II) sulfate turns from white to blue.
- Cobalt(II) chloride paper turns from blue to pink.
- Uses of Water:
- Domestic: Drinking, cooking, washing.
- Agricultural: Irrigation.
- Industrial: Solvent, coolant, hydroelectric power.
Teaching Aids:
- Water samples
- Copper(II) sulfate and cobalt(II) chloride
- Diagrams of molecular structure
See Also
Physics E-Note
SS2 Chemistry 3rd Term Lesson Notes
Evaluation:
- Differentiate between soft and hard water.
- State methods of removing water hardness.
