Question

Design an activity to show the conditions needed for iron nails to rust class10

Answer 1

Hey mate! Here’s my say to it,

Aim: to investigate the conditions under which iron rusts.

Materials required: 3 test tubes , few iron nails, water, boiled water, 3 corks, anhydrous calcium chloride, test tube stand, oil

Procedure:

1. Take 3 testubes and label then A,B,C respectively and place two nails in each of them.
2. In test tube A, put some normal water ( not boiled) so that it submerges the needle halfway. Put the cork and seal.
3. In test tube B, put distilled water till it covers the nails completely   and few drops of oil on top. Seal with cork.
4. In text tube C, put anhydrous calcium chloride and seal.
5. Place the three on the test tube stand. Leave it for a few days.
6. Make observations

Observation: In test tube A, the needles begin to rust. In test tube B, needles don’t accumulate any rust. In test tube C, they don’t accumulate any rust too.

Theory: Needles need air to rust, and it is openly present only in A. In B, the water is distilled, thus is devoid of any dissolved air. And the oil, cuts off supply to air too. Anhydrous calcium chloride is a drying agent, which absorbs moisture content, and hence rust doesn’t form due to lack of moisture.

Conclusion: Iron needs exposure to air and moisture to form rust.

Hope my time was worth it.

Good day