28.03.2023 - 15:10

When a piece of zinc metal is added to a solution of Cu^{2+}, Zn^{2+} appears in solution and a film of copper metal forms on the piece of zinc metal. What does this tell you about the reactivity of the element zinc relative to that of the element copper?

Question:

When a piece of zinc metal is added to a solution of {eq}\rm Cu^{2+}, Zn^{2+} {/eq} appears in solution and a film of copper metal forms on the piece of zinc metal. What does this tell you about the reactivity of the element zinc relative to that of the element copper?

a. Copper metal is more reactive than zinc metal.

b. Zinc metal is more reactive than copper metal.

c. The reactivities of copper metal and zinc metal are \approx imately equal.

d. No conclusions can be drawn about the relative reactivity of these two elemental metals.

Answers (1)
  • Ivan-fast-food
    April 2, 2023 в 21:59

    The observation that a piece of zinc metal added to a solution of Cu2+ and Zn2+ results in the formation of a film of copper metal on the surface of the zinc, suggests that zinc is more reactive than copper.

    This can be explained by the fact that zinc has a greater tendency to lose electrons and form positive ions compared to copper. When zinc is added to the solution containing copper ions, zinc atoms lose electrons to form Zn2+ ions which go into solution. Meanwhile, Cu2+ ions in the solution gain electrons from the zinc atoms to form metallic copper, which appears as a film on the surface of the zinc metal.

    Therefore, the correct answer to the question is (b) Zinc metal is more reactive than copper metal.

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