5. Explain what happens in the following cases. i. Sodium is added to water. ii. Potassium iodide is added to lead nitrate. iii. Ammonium chloride is heated. iv. Iron sulphide is heated with dilute hydrochloric acid.
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Answers
Answer:
1) When sodium is added to water, the sodium melts to form a ball that moves around on the surface. It fizzes rapidly, and the hydrogen produced may burn with an orange flame before the sodium disappears.
2) When a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube, the precipitation of a yellowish solid is observed. This yellowish solid is lead iodide.
3) If we heat solid ammonium chloride , it will result in sublimation. That is ,it will directly change from solid to vapour . The process of changing solid directly into vapour on heating and change of vapour into solid on cooling is called sublimation
4) The compound iron sulphide (FeS) is formed on heating iron (Fe) and sulphur (S). Iron sulphide reacts with dilute hydrochloric acid forms hydrogen sulphide (H2S) gas which turns lead acetate paper into shiny black
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Answer:
1.When sodium is added to water, the sodium melts to form a ball that moves around on the surface