Activity 3.1 Class 9 Science Atoms and Molecules | NCERT Activity 3.1 Class 9 Science

 Activity 3.1 Class 9 Science belongs to Chapter 3 Atoms and Molecules Class 9 Science. You will get a complete solution with an explanation and a conclusion. After reading activity 3.1, you will be able to answer the questions based on the activity.

Activity 3.1 Class 9 Science Atoms and Molecules

 

You are suggested to study NCERT activity 3.1 class 9 science Atoms and Molecules explanation with a conclusion so that you can attempt questions based on the activity 3.1 class 9 science. Activity 3.1 class 10 science will be very useful for you.

 

Activity 3.1 Class 9 Science

    ·     Take one of the following sets, X and Y

	X	Y
(i)	Copper sulphate 1.25g	Sodium carbonate 1.43g
(ii)	Barium chloride 1.22g	Sodium sulphate 1.53g
(iii)	Lead nitrate 2.07g	Sodium chloride 1.17g

 

   ·     Prepare separately a solution of any one pair of substances listed under X and Y each in 10 mL water.

   ·     Take a solution of Y in a conical flask and a solution of X in a small test tube.

   ·     Hang the small test tube in the flask carefully; see that the solutions do not get mixed. Put a cock on the flask.

Conservation of mass 

Observation Activity 3.1 Class 9 Science

We observe that the mass of the conical flask along with its contents remains unchanged after the chemical reaction.

If we take sodium chloride in the test tube and lead nitrate in the flask, the following reaction takes place.

Pb(NO₃)₂   + 2NaCl → 2NaNO_3(aq) +  PbCl_2(s)↓

In this reaction, lead chloride remains as a precipitate.

The cork is used to seal the mouth of the flask so that no solution and gas come out of the flask. The mass of the flask and its contents does not change.

Explanation Activity 3.1 Class 9 Science

This activity explains the law of conservation of mass. According to this law – In every chemical reaction, the total masses of all the reactants are equal to the masses of products.

Conclusion Activity 3.1 Class 9 Science 

After the chemical reaction, the total mass remains constant. 

Related Topics for You

1.  Activity 3.2 Class 9 Science

2. Solution of Chapter 3 Atoms and Molecules