◊ When we have a chemical reaction, how do we know which element will react with what, and their position? For example in the cheamical reaction :   Cu_(s)+2AgNO_{3 (aq)} →2Ag_(s)+Cu(NO₃)_{2 (aq)} why cannot we say:... →Cu(NO₃)_{2 (aq)}+2Ag_(s)

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Do you know that when a compound breaks, there will be two ions with + and -  . For example when HCl dissolve in water , H⁺ and Cl^- forms, it depends upon this factor.