Understanding Solubility of Substances

The video tutorial introduces the concept of solubility, explaining that some substances dissolve in water while others do not. It demonstrates tests with various substances: salt, sugar, vinegar, juice, and food coloring are soluble, while oil, sand, flour, and margarine are insoluble. Each test is shown to illustrate the solubility or insolubility of the substance in water.

What is the main topic of this lesson?

• Conductivity

• Acidity

• Solubility

• Density

Which of the following substances dissolves completely in water?

• Salt

• Flour

• Oil

• Sand

What happens when sugar is mixed with water?

• It dissolves completely

• It floats on top

• It sinks to the bottom

• It makes the water cloudy

Which substance does not dissolve in water and floats on top?

• Juice

• Vinegar

• Oil

• Salt

What is the result when sand is added to water?

• It floats on top

• It dissolves completely

• It remains undissolved

• It changes color

Which of the following substances dissolves quickly in water?

• Margarine

• Sand

• Flour

• Vinegar

What happens when margarine is mixed with water?

• It makes the water cloudy

• It floats on top

• It dissolves completely

• It remains undissolved