Question

10. How do you test the presence of starch in rice!
11. How can you prove that liquids expand on heating?​

Answer 1

Iodinetest is used to test the presence of starch (carbohydrate). Boiled rice and crushed potato contain more amount of starch thereby responding to iodinetest. They develop blue-black colour with iodine.

Iodinetest is used to test the presence of starch (carbohydrate). Boiled rice and crushed potato contain more amount of starch thereby responding to iodinetest. They develop blue-black colour with iodine.Experiment - Take a round bottom flask and fill it with water. Close its mouth with a cork having a delivery tube and mark the level of water as A. Now heat the flask, we see that the level of water in the tube rises from A to a higher mark B. Observation - This shows that liquids expand on heating.

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Answer 2

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10.Iodinetest is used to test the presence of starch (carbohydrate). Boiled rice and crushed potato contain more amount of starch thereby responding to iodinetest. They develop blue-black colour with iodine.

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11.Take a round bottom flask and fill it with water. Close its mouth with a cork having a delivery tube and mark the level of water as A. Now heat the flask, we see that the level of water in the tube rises from A to a higher mark B. Observation - This shows that liquids expand on heating.

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