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 2.4 Class 9 Science Explanation with a conclusion.
Activity
2.4 NCERT Class 9 Science Is Matter Around Us Pure
You are
suggested to study NCERT activity 2.4 class 9 science Is matter around us pure
explanation with a conclusion so that you can attempt questions based on the
activity 2.4 class 9 science. Activity 2.4 class 10 science will be very useful
for you.
Activity 2.4 Class 9 Science
·
Fill half a beaker with water.
·
Put a watch glass on the mouth of the beaker.
·
Put a few drops of ink on the watch glass.
·
Now start heating the beaker. We do not want to heat the ink directly.
You will see that evaporation is taking place from the watch glass.
·
Continue heating as the evaporation goes on and stop heating when you do
not see any further change on the watch glass.
·
Observe carefully and record your observations.
After
performing the activity, answer the following questions
i. What do you think has got evaporated from the watch glass?
ii. Is there a residue on the watch glass?
iii. What is your interpretation? Is ink a single substance(pure) or is it a
mixture?
.webp "Activity 2.4 NCERT Class9 Science Is Matter Around Us Pure") |
| Evaporation |
Observation Activity 2.4 Class 9 Science
In this
activity, we separate the components of a mixture(solution). As the different
substances have different boiling points. so this property is used to separate
components from the mixture.
Ink is a
mixture of a dye in water, dye is solid and non-volatile and water is volatile
so through evaporation these components (solute and solvent) are separated.
Answers to the above questions
i.
When ink is heated, the volatile component of the mixture i.e. Water gets evaporated.
ii.
Yes, non-volatile component i.e. Dye remains as residue on the watch
glass.
iii.
When we heat ink continuously, ink may undergo decomposition because the ink
is a mixture.
Conclusion Activity 2.4 Class 9 Science
In this
activity, volatile and non-volatile components are separated by evaporation.
Related Topics for you
1. Next Activity - Activity 2.5Class 9 Science
2. Previous Activity-Activity 2.3 Class 9 Science
