you are given samples of three metals -sodium,magnesiumand copper. suggest any two activities to arrange them in order of their decreasing reactivity.
Answers
1) Reaction with oxygen- Sodium catches fire when kept open in the air , so sodium reacts very vigorously with oxygen.
Magnesium reacts with oxygen only on whereas copper reacts with oxygen on very strong heating.This reaction shows that here sodium is the most reactive metal and copper is the least reactive metal show the decreasing order of reactivity is Sodium, magnesium and then copper.
2)Reaction with water- Sodium reacts very vigorously even with cold water.
Magnesium reacts slowly with cold water but rapidly with hot, boiling water, whereas copper does not react even with steam. This activity shows that your sodium is the most reactive metal and copper is the least reactive metal. Show the order of their decreasing reactivity is Sodium, magnesium and then copper.
Answer:
(i) When sodium, magnesium and copper are left in air, sodium reacts vigorously with oxygen to form sodium oxide, magnesium reacts with oxygen to form magnesium oxide only on heating, whereas copper does not burn in air even on strong heating. It reacts only on prolonged heating. This shows that sodium is most reactive, then magnesium and copper is the least reactive among the three.
(ii) Sodium reacts vigorously with cold water to form sodium hydroxide and hydrogen, magnesium does not react with cold water but reacts with hot water to form magnesium hydroxide and hydrogen but copper does not react even with steam. This shows that sodium is highly reactive; magnesium is less reactive than sodium and copper is the least reactive among the three.
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