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Lesson 21: Dissolving Solute, solvent, solution Solubility (qualitative) Everyday examples (sugar, salt)
Year 8 • Chemistry
Lesson 21: Dissolving
In this lesson, students learn what dissolving means, understand the terms solute, solvent, and solution, and explore solubility using everyday examples such as sugar and salt.
Lesson Objectives
- Define solute, solvent, and solution.
- Explain what dissolving means.
- Understand solubility in a simple way.
- Relate dissolving to everyday life.
1. What Does Dissolving Mean?
Dissolving happens when a substance mixes completely with a liquid and seems to disappear.
The substance does not vanish — its particles spread evenly through the liquid.
[ Image Placeholder – Sugar Dissolving in Water ]
Example:
• Sugar dissolving in tea
• Salt dissolving in water
• Sugar dissolving in tea
• Salt dissolving in water
2. Solute, Solvent, and Solution
Special words are used to describe dissolving.
[ Image Placeholder – Solute Solvent Solution Diagram ]
• Solute: the substance that dissolves (e.g. sugar)
• Solvent: the liquid that does the dissolving (e.g. water)
• Solution: the mixture formed (e.g. sugar solution)
• Solvent: the liquid that does the dissolving (e.g. water)
• Solution: the mixture formed (e.g. sugar solution)
3. Solubility (Qualitative)
Solubility describes how well a solute dissolves in a solvent.
At this level, we describe solubility using words, not numbers.
[ Image Placeholder – Soluble vs Insoluble ]
• Sugar is soluble in water
• Salt is soluble in water
• Sand is insoluble in water
• Salt is soluble in water
• Sand is insoluble in water
4. Dissolving in Everyday Life
Dissolving is important in daily life and science.
[ Image Placeholder – Dissolving in Daily Life ]
• Sugar dissolves in drinks
• Salt dissolves in cooking water
• Medicines dissolve in the body
• Salt dissolves in cooking water
• Medicines dissolve in the body
Practice Questions
A. Fill in the Blanks
- The substance that dissolves is called the __________.
- The liquid that does the dissolving is the __________.
- The mixture formed is the __________.
- Sugar is __________ in water.
- Sand is __________ in water.
B. True or False
- Dissolving means the substance disappears forever.
- Water is a common solvent.
- Salt dissolves in water.
- Solubility can be described using words.
- A solution contains a solute and a solvent.
C. Short Answer
- What does dissolving mean?
- What is a solute?
- What is a solvent?
- Give one soluble substance.
- Give one insoluble substance.
✅ Show Answer Key
A. Fill in the Blanks
- solute
- solvent
- solution
- soluble
- insoluble
B. True or False
- False
- True
- True
- True
- True
C. Short Answer
- When a substance mixes completely with a liquid.
- The substance that dissolves.
- The liquid that dissolves the solute.
- Sugar / salt.
- Sand / chalk.
© Aviate Learning – Dissolving (Year 8)
🧪 Interactive Dissolving Simulator
Choose a solute, add it to water, and observe whether it dissolves.
Identify the solute, solvent, and solution.
Choose a solute and click “Add to Water”.