Activity 2.9 Class 9 Science Is Matter Around Us Pure
In this
post, you will find NCERT Science Class 9 Chapter 2 Activity solutions. In
Class 9 science chapter 2 Is Matter Around Us Pure consists of NCERT Activity
2.9 Class 9 Science Explanation with a conclusion.
Activity 2.9 NCERT Class9 Science Is Matter Around Us Pure
You are
suggested to study NCERT activity 2.9 class 9 science Is matter around us pure
explanation with a conclusion so that you can attempt questions based on the
activity 2.9 class 9 science. Activity 2.9 class 10 science will be very useful
for you.
Activity
2.9 Class 9 Science
·
Take
some impure sample of copper sulphate in a china dish.
·
Dissolve
it in a minimum amount of water.
·
Filter
impurities out.
·
Evaporate
water from the copper sulphate solution so as to get a saturated solution.
·
Cover
the solution with a filter paper and leave it undisturbed at room temperature
to cool slowly for a day.
·
You
will obtain crystals of copper sulphate in the china dish.
 |
| Crystallisation |
Answer the following questions
i. What do you observe in the china dish?
ii. Do the crystals look alike?
iii. How will you separate the crystal from the liquid in the china dish?
Observation
After
the evaporation of the solution, we get crystals of copper sulphate.
Explanation Activity 2.9 Class 9 Science
This
method is known as Crystallisation. This method is used to form solid crystal from a solution. In crystallization,
separation of solid form liquid by evaporating the liquid.
After
the evaporation of water, the solution becomes concentrated and when it is
allowed to cool slowly, crystals of solid(solute) are formed.
So
crystallisation is used to purify an impure solid.
Conclusion Activity 2.9 Class 9 Science
Impure solids can be purified by the crystallisation.
The answer to the above questions
i. We observe crystals of copper sulphate in the china dish.
ii. The crystals look alike because they have a definite shape.
iii. We can use filter paper to separate crystals from a liquid.
Related Topics for you
1. Next Activity - Activity 2.10 Class 9 Science
2. Previous Activity-Activity 2.8 Class 9 Science
