NCERT activity 1.1 Class 9 Science with conclusion

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?

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.

 Related Topics 

1.   Activity 1.2 Class 9 Science

2. Solutions of Chapter 1 Class 9 Science