Course Content
Lesson 1 – Human Body : The Food We Eat
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Lesson 3 – Human body : The Digestive and Excretory systems
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Lesson 4 : Plants in the Surroundings and Environment
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Lesson 6 : Adaptation in Animals
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Lesson 8 : Materials and Solutions
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Lesson 10 : Measurement
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Lesson 11 : Push and Pull
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Lesson 12 : Friction as a Force
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Class 4 – EVS
    About Lesson

    26/11/20                                    Materials and Solutions

    1. Define the following:

    a. Solute

    A. The substance that dissolve in a solvent is called solute. eg: Salt

    b. Solvent

    A. The substance in which a solute is dissolved is called a solvent. eg: water

    c. Solution

    A. The mixture obtained when a solute dissolves in a solvent is called a solution.Solution=Solute+Solvent

    eg: Salt + water= salt solution

    d. Miscible

    A. Liquids that mix well with each other is called miscible liquids.eg: Milk and water

    e. Immiscible

    A. Liquids that do not mix well with each other is called immiscible liquids. eg: oil and water

    Short answer:

    1. Can we change a liquid to a solid? Which process should we use?

    A. Yes we can change liquid to solid by cooling. The process is called freezing.

    2. What do you understand by insoluble substances?

    A. The substance that does not dissolve are called insoluble substance. eg:leaf in water

    3. What is evaporation?

    A, The process by which a liquid changes to a gas on heating is called evaporation.

    4. What are the conditions that help one to make a solution quickly?

    A. 1. Powdering the solute

        2. Warming the solvent

         3. Stirring the mixture well