大家好，話説明天又是兼職芒果化學小考的日子，今天想為大家講解displacement reactions 145Please respect copyright.ＰＥＮＡＮＡ84BI0tcYGe
Displacement reaction takes place when a more reactive metal is put into an aq solution of a least reactive metal (except for potassium, sodium, calcium, which reacts with water in the solution to give metal hydroxide ). Or when a compound with least reactive metal is heat with a more reactive metal.
note: displacement reaction is a redox reaction (involves reduction and oxidation)
example : Magnesium + copper(II) nitrate --> magnesium nitrate + copper
spectator ion: nitrate ion
reason: magnesium is more reactive than copper. Thus magnesium displaces copper from copper nitrate
or Copper nitrate is reduced by magnesium to copper while magnesium itself undergoes oxidation to form magnesium ion / magnesium nitrate 145Please respect copyright.ＰＥＮＡＮＡLJn99r28f7
observation :145Please respect copyright.ＰＥＮＡＮＡM9d63hPqT0
1. magnesium dissolves
2. brown solid is deposited on the surface of magnesium 145Please respect copyright.ＰＥＮＡＮＡnpT1tSRUWH
(allow magnesium to donate electron to copper(II) ions to form magnesium ion and copper atom )
3. the solution turns from blue to pale blue
as the concentration of blue copper(II) ions decreases
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