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19 September, 23:04

Hydrogen gas and aqueous zinc chloride are produced by the reaction of aqueous hydrochloric acid and solid zinc. Write a balanced chemical equation for this reaction.

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  1. 19 September, 23:13
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    1. Write out all the ions/elements and indicate whether they are reactants or products.

    Reactants:

    Aqueous Hydrochloric Acid: HCl (H has a charge of + 1 and Cl has a charge of 1-, so when an ionic bond forms they will form HCl).

    Solid Zinc: Zn (since it is a solid zinc with no other forms of elements, the zinc is pure).

    Products:

    Hydrogen gas: H2 (it has to be H2 because Hydrogen is a diatomic element, and when by itself during reactions, will be H2 instead of H).

    Aqueous Zinc Chloride: ZnCl2 (Zn has a charge of 2 + and Cl has a charge of 1-, so through an ionic bond, they will form ZnCl2).

    2. Using this information, you can then write out the unbalanced equation.

    HCl + Zn - > H2 + ZnCl2

    3. Next, indicate their states of matter and any aqueous solutions.

    HCl (aq) + Zn (s) - > H2 (g) + ZnCl2 (aq)

    4. Try different numbers until you get the same numbers of H, Cl, and Zn on both sides.

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

    As you can see, the equation contains 2 Hydrogen atoms on both sides, 2 Chloride atoms on both sides, and 1 Zinc atom on both sides. The equation is chemically balanced.
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