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What do you observe when :1. a spoon of sugar is heated in a pan2. lighted match stick is brought near the mouth of the test tube containing hydrogen gas.3. quick lime is dissolved in water.4. little amount of curd is added to a bowl containing warm milk and kept for five hours. |
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Answer» 1. a spoon of sugar is heated in a pan When a spoon of sugar is heated in a pan, black (charred sugar) (carbon) is seen. Is a chemical change. 2. lighted matchstick is brought near the mouth of the test tube containing hydrogen gas. We observe that hydrogen bums at the mouth of the test tube with the blue flame and pop sound are heard. It is a chemical change. 3. quicklime is dissolved in water. The following two observations will be observed (i) A hissing sound is observed. (ii) The mixture starts boiling and lime water is obtained. 4. little amount of curd is added to a bowl containing warm milk and kept for five hours. When a little amount curd is added to a bowl containing warm milk and kept for five hours, a permanent change occured. The milk will change to curd. On boiling water changes into steam (gas) physical change. |
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