Question

For an investigation, a student poured a blue solution of CuSO4 into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes. What evidence supports the inference that a chemical reaction occurred?

A) A dark solid formed on the zinc metal.
B) The zinc metal remained silver-colored and shiny.
C) The CuSO4 solution turned blue when the zinc metal was added.
D) None of these

Answer 1

The evidence that supports the inference that a chemical reaction occurred is the formation of a dark solid on the zinc metal. copper(II) ions (Cu^2+) in the solution gain electrons and are reduced to form copper metal (Cu) which appears as a dark solid on the surface of the zinc strip.

Step-by-step explanation:

The evidence that supports the inference that a chemical reaction occurred when the silver-colored strip of zinc metal was placed in the blue solution of CuSO4 is option A) A dark solid formed on the zinc metal. When zinc metal reacts with copper(II) sulfate, the zinc atoms lose electrons and are oxidized to form zinc ions (Zn^2+). At the same time, the copper(II) ions (Cu^2+) in the solution gain electrons and are reduced to form copper metal (Cu) which appears as a dark solid on the surface of the zinc strip.

evidence that supports the inference that a chemical reaction occurred is the formation of a dark solid on the zinc metal. copper(II) ions (Cu^2+) in the solution gain electrons and are reduced to form copper metal (Cu) When zinc metal reacts with copper(II) sulfate, the zinc atoms lose electrons and are oxidized to form zinc ions (Zn^2+). which appears as a dark solid on the surface of the zinc strip.