Page 127 - Innovator's Science-8

5. What is a universal solvent?
a. A solvent that can dissolve any substance

b. A solvent that can dissolve only a few substances
c. Water 5. a b c d
d. Alcohol

B. Fill in the blanks. Observational Skills
1. The substance that dissolves in a solution is called the ____________.
2. The substance that dissolves the solute is called the ____________.
3. In a sugar solution, sugar is the ____________ and water is the ____________.

4. When a solute is dissolved in water, the solution is called an ____________ solution.
5. The particles in a solution do not ____________ a beam of light passing through it.

C. State whether the given statements are True (T) or False (F). Problem Solving Skills
1. A solution is a homogeneous mixture.
2. The substance that dissolves is called the solvent.

3. Solute particles in a solution are visible to the naked eye.
4. The solubility of most solids increases with an increase in temperature.
5. The solubility of gases in liquids decreases with an increase in temperature.

D. Short answer type questions.
Decision-making Skills
1. What is one solute in a solution of two liquids?

2. Name three possible solutes present in the air.
3. What is termed as concentration?
4. How does the solubility of solids change with the temperature rise?
5. How is the density of a substance measured?

E. Long answer type questions. Critical Thinking Skills
1. How will you change an unsaturated solution to a saturated solution?

2. What is density? Explain with an example.
3. Which is heavier: a wooden stick or an iron rod? Explain.

Project Ideas Exploration

• Inves gate how well common salt dissolves in different solvents, such as water, vinegar, and oil.
Compare the solubility of salt in each solvent and record your observa ons.

Life Skills Inference

• Water is called the most versa le solvent because it can dissolve a wide range of substances,
including solids, liquids, and gases. What proper es of water make it the most versa le solvent?

Enhance your Life Skills Mental Development
• Research project on Dead Sea: Why is there no aqua c life in the Dead Sea? Try to find out if there
are any other similar water bodies.

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