How do I balance these reactions? lg ouase the amount of energy that is released

Question

How do I balance these reactions?

lg ouase the amount of energy that is released into the environment o course of the chemical change. The equation is shown in unbalanced and balanced forms. Note of coefficients to multiply selectively the formulas of the substances to reflect the law of conse of mass. The formulas, however, must not be changed during the balancing process! Finally,a equation typically contains coefficients in the smallest possible whole integer values. H2(g) + O2(g) H2O(g) (unbalanced) 2H2(g) + O2(g)2H2O(g) (balanced) The following six chemical equations describe the six reactions that you used to convert cop various compounds and ultimately reproduce the original copper sample. Consistent with the conservation of mass, determine if each of the given equations are balanced. Balance thoset unbalanced by including the appropriate coefficients. Reaction 1: Cu(s) + 4H (a) + 2NO5(a) Cu?*(ag)+ 2NO8)+ H,00) Reaction 2: Cu2+(aq)+OH-(aq) Cu(OH)2(s) Reaction 3: Cu(OH)2(s) CuO(s) + 2H20(1) Reaction 4: CuO(s) + H"(aq) + HSO4(aq) Cu2+(aq) + SO2-(aq) + H2O() Reaction 5: Cu2+(aq) + Zn(s) Cu(s) + Zn2+(aq) Reaction 6: Zn(s) + H+(aq) Zn2+(aq) + H2(g) istry of Copper Laboratory 2 The Discovery of Chemical Change Through the Chem

Explanation / Answer

Answer – We are given the six copper synthesis reactions and we need balance the reaction which are unbalanced.

Reaction 1- This reaction is given unbalanced with respect to H and O, so balanced reaction as follow –

Cu(s) + 4H+(aq) + 2NO3- ------> Cu2+(aq) + 2NO2(g) + 2 H2O(l)

Reaction 2- This reaction is given unbalanced with respect to H and O, so balanced reaction as follow-

Cu2+(aq) + 2 OH-(aq) ------> Cu(OH)2(s)

Reaction 3 – In this one there is coefficient of H2O is given wrong, since it is already balanced equation. If we need to balance the reaction including with 2 H2O(l) then we need to balance the other element also and it is not balanced at lowest coefficient, so balanced reaction as follow-

Cu(OH)2(s) ----> CuO(s) + H2O(l)

Reaction 4 – This reaction is already balanced,

CuO(s) + H+(aq) + HSO4- -----> Cu2+(aq) + SO42-(aq) + H2O(l)

Reaction 5- This reaction is already balanced,

Cu2+(aq) + Zn(s) ------> Cu(s) + Zn2+(aq)

Reaction 6 – In this reaction there is H is imbalanced in the reactant side, since in the product side there are 2 H, so we need 2 H in reactant also. So the balanced reaction is as follow –

Zn(s) + 2 H+(aq) -------> Zn+(aq) + H2(g)

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