In this post, you will find NCERT Science Class 9 Chapter 1 Activity solutions. In Class 9 science chapter 1 matter in our surroundings consists of NCERT Activity 1.1 Class 9 Science Explanation with a conclusion. You can read a complete explanation of activity 1.1 class 9 science.
NCERT Activity 1.1 Class 9 Science Explanation with a Conclusion
You are suggested to
study NCERT activity 1.1 class 9 science explanation with a conclusion so that
you can attempt questions based on activity 1.1 class 9 science.
Aim of
activity
To identify
that matter is made up of small particles
Activity 1.1 Class 9 Science
·
Take a 100 ml beaker
·
Fill half the beaker with water and mark the level of water
·
Dissolve some salts/sugar with the help of a glass rod
·
Observe any change in water level.
·
What do you think has happened to the salt?
·
Where does it disappear?
·
Does the level of water change?
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Observation
During this
activity, the level of water in the beaker remains the same. The drop of the
solution tastes sweet and the sugar crystals are not visible in the solution.
Explanation
The particles
of salt or sugar are distributed in water and form a homogenous solution. These solute particles settle down in the spaces
of solvent particles.
Conclusion
This
activity shows that the matter consists of small particles. There are some
vacant spaces called voids. When sugar is added to water and gets mixed well
then, the empty spaces are occupied by sugar particles.
So it
dissolves and forms a uniform solution of water with sugar.
Activity 1.1 Video
Take a Quiz
Questions based on the activity 1.1 class 9 science
1. Do you observe any change in water level after the dissolution of sugar?
Ans. – No, there is no change in water level when we dissolve sugar?
2. What happened to sugar particles?
Ans. – Sugar particles break down into smaller particles when they dissolve in water.
3. Where do sugar particles disappear?
Ans.- sugar particles occupy empty spaces present in between water particles.
4. What is the final conclusion of the given activity?
Ans – this activity shows that matter is made up of small particles.
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