NCERT Activity 2.4 Class 9 Science Explanation with a conclusion | Activity 2.4 NCERT Class9 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 2.4 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?

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

3. Solutions of Chapter 2 Is Matter Around Us Pure