Question 15 Read the question and type your response in the box provided. Your response will be saved automatically
Selina claims that combining copper sulfate and zinc created a chemical reaction. Construct an explanation that addresses the following parts:
Part A: Identify the evidence of chemical or physical changes in the experiment.
Part B: Explain why Selina is correct or incorrect using evidence from the experiment.
Part C. Describe what happened to the copper and zinc atoms during the experiment. Explain your answer.
B I
52

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Explanation:

The reaction between zinc and copper sulphate is an example of an oxidation-reduction reaction.

The  reaction equation is: CuSO4(aq) + Zn(s) > ZnSO4(aq) + Cu(s).

When the zinc rod is dipped into the copper sulphate  solution, the zinc rod gradually disappears and the blue colour of the solution fades. All these point to the fact that a chemical reaction is taking place. This reaction occurs because zinc is higher than copper in the electrochemical series thus zinc has a more negative reduction potential than copper.

The zinc atoms become oxidized because they loose two electrons and the copper atoms become reduced because they gain two electrons. This can easily be seen from the reaction equation written above.

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