Question

Zn----> Zn(2+) +2e- solve the chemical equations {FOR INFO: this equation is of dry cell}

Plz answer ​

Answer 1

Zinc =》

Zinc metal reacts with hydrochloric acid. 

Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g) - "molecular" equation 

Zn(s) + 2H+ + 2Cl- --> Zn^2+ + 2Cl- + H2(g) - ionic equation 

Zn(s) + 2H+ --> Zn^2+ + H2(g) - net ionic equation 

Zinc is shown both as a metal, and as an ion. 

Zinc about it. It can either be metallic zinc, in which case it is not an ion and not written with a charge, or it can be in aqueous solution as a "free" zinc ion, where it will have a charge of +2. Most zinc compounds have bonds with substantial covalent character and there is no complete transfer of electrons within the compound. Therefore, there are no Zn^2+ ions in compounds. 

Only when the zinc compounds dissolve in water and are actually separated (dissociated), will the bonding electrons go with the more electronegative element and form Zn^2+ ions and some negatively charged ions. 

ZnCl2(s) --H2O--> Zn^2+(aq) + 2Cl-(aq) 

But in solid ZnCl2 the bonds have about 43% ionic character (57% covalent character). The charge on Zn atoms in the solid salt will be around +0.5 (not +2), and the chlorine atoms have charges of about -0.25 (not -1). 

Predicting ionic character from L. Pauling's equation: 

% ionic character = 100(1 - e^(-ΔEN²/4))

Explanation:

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