Ans. Cotton and paper, both are plant products and they both contain an organic compound named ‘Cellulose’. So while burning cotton and paper, when this cellulose is burnt it gives out a similar characteristic smell. Hence when we burn cotton, it smells just like burning paper.

On the other hand, As we all know, wool is obtained from animal fleece or hair. Animal hair has protein fibre (keratin) which also contains some Sulphur containing amino acids in it. Human hair also is made up of the same fibre protein keratin. Hence on burning, wool smells very similar to that of burnt hair.

Now answer this:

Paheli went to the market to buy sarees for her mother. She took out a thread from the edge of the two sarees shown by the shopkeeper and burnt them. One thread burnt with a smell of burning hair and the other burnt with the smell of burning paper. Which thread is from a pure cotton saree and which one from a pure silk saree?

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Ethyl Mercaptan, a sulfur compound is a clear liquid with a very strong and distinctive smell. Adding it helps us to identify and alert the user about a gas leakage which would otherwise go unnoticed due to the odourless LPG Gas leading to dangerous situations like a fire or explosion.

Ethyl Mercaptan is not only used as an additive to odorless gases like butane, propane, and petroleum to give them a warning odor BUT is also used in the manufacture of fungicides, pharmaceuticals, insecticides, resins, and other chemicals.

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Milk is a mixture of water, fat, vitamins and minerals. When soap is added to the milk, it helps to separate the water and fat in the milk. When soap is mixed in with the fat and water, the hydrophobic end of the soap molecule breaks up the nonpolar fat molecules, and the hydrophilic end of the soap molecule links up with the polar water molecules. Now that the soap is connecting the fat and water, the nonpolar fat molecules can be carried by the polar water molecules.

As the soap molecules connect to the fat molecules, the molecules of the food coloring get pushed around everywhere resulting in an explosion of color! As the majority of soap molecules attach to the fat molecules and the soap spreads throughout the milk, the color explosion will slow and eventually stop. Add more soap and see if there are more fat molecules that haven’t attached to soap – if there are unattached fat molecules still, the color explosion will begin again.

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