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.
.webp "Activity 3.1 Class 9 Science Atoms and Molecules") |
| Conservation of mass |
Observation
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 → 2NaNO3(aq) + PbCl2(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
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
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
