complete and balance the following :
Zn(s)+HCl(aq)->
Zn(s)+Cu2+(aq)->
To complete and balance the given chemical equations, we need to consider the conservation of mass and charge. Let's go step by step:
1. Zn(s) + HCl(aq) -> ?
In this reaction, zinc (Zn) reacts with hydrochloric acid (HCl) to form a salt and release hydrogen gas. The balanced equation is as follows:
Zn(s) + 2HCl(aq) -> ZnCl2(aq) + H2(g)
Here's how to balance it:
Zn(s): Zinc is a solid element on the left-hand side, so it has a coefficient of 1 (since it is already balanced).
HCl(aq): Hydrochloric acid is in its aqueous (dissolved) form on the left-hand side. It contains hydrogen (H) and chloride (Cl) ions. To balance hydrogen, we need two HCl molecules.
H2(g): The reaction produces hydrogen gas. Since we have balanced hydrogen on both sides, we have H2 on the right-hand side.
ZnCl2(aq): Zinc chloride is formed as a result of the reaction. To balance it, we put a coefficient of 1 in front of ZnCl2.
Now, let's move on to the next equation.
2. Zn(s) + Cu2+(aq) -> ?
In this reaction, zinc (Zn) reacts with copper(II) ions (Cu2+) to form zinc ions (Zn2+) and copper metal (Cu). The balanced equation is as follows:
Zn(s) + Cu2+(aq) -> Zn2+(aq) + Cu(s)
Here's how to balance it:
Zn(s): Zinc is a solid element on the left-hand side, so it has a coefficient of 1 (since it is already balanced).
Cu2+(aq): Copper(II) ions are dissolved in water on the left-hand side. To balance the charges, we need two Cu2+ ions.
Zn2+(aq): Zinc ions are formed as a result of the reaction. To balance the charges, we need two Zn2+ ions.
Cu(s): Copper is a solid metal formed on the right-hand side. Since we have balanced copper on both sides, we have Cu.
Therefore, the balanced equation is:
Zn(s) + Cu2+(aq) -> Zn2+(aq) + Cu(s)
Your equation makes absolutely no sense.
Zn + 2HCl ==> ZnCl2 + H2 and there is no way Cu^2+ can get into the solution on the right without being present on the left.