Activity 1.6 Class 10 Science -

In this post, we will discuss activity 1.6 from Chemical reactions and equations of class 10 science.

Table of Contents

Aim of the activity

To observe the effect of heat on lead nitrate powder and identify the changes due to its thermal decomposition

Activity 1.6 Class 10 Science diagram

Material used in the activity

Boiling tube
Lead nitrate powder
Tongues
Spirit lamp or burner

Procedure

We will take about 2 g lead nitrate powder in a dry boiling tube and heat over the flame of a burner or spirit lamp.

Observation

We can observe that lead nitrate is white powder but after heating it turns yellow and a brownish gas is released

On heating lead nitrate, reddish brown fumes with pungent smell are evolved and a yellow residue remains in the test tube.

Explanation

Lead nitrate is a white salt that undergoes thermal decomposition when heated. Lead nitrate decomposes into lead oxide which is yellow and release brown gas nitrogen dioxide along with oxygen.

2Pb(NO₃)₂ (s) → 2PbO(s) + 4NO₂(g) + O₂(g)

Lead nitrate Lead oxide

Conclusion

This activity shows the thermal decomposition of lead nitrate that produces lead oxide, nitrogen dioxide and oxygen.

Precaution: Do not point the mouth of boiling tube at neighbours or yourself.

FAQs

What happens to lead nitrate when it is heated?

Ans- lead nitrate decomposes into lead oxide, nitrogen dioxide and oxygen gas.

Name the brown gas which is evolved during the heating of lead nitrate.

Ans – Nitrogen dioxide gas (NO2)

What is the yellow residue after heating of lead nitrate?

Ans- Lead oxide (PbO)

Is the process of heating lead nitrate reversible?

Ans – No , this process is not reversible.

What is the name of chemical reaction of heating of lead nitrate?

Ans – Thermal decomposition reaction

Activity 1.6 Class 10 Science