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Consider the chemical reaction between a piece of aluminum foil and Copper(11)Chloride solution in a beaker given by thebalanced chemical equation:2 Al + 3 CuCl =3 Cu +2 AlCl3Which of these observations would not support that this chemical reaction has occurred?1)A)The color of the liquid changes from blue to clear.B)To make copper(II)chloride go into solution you must stir it.c)A reddish brown precipitate forms on the bottom of the beaker.D)The amount of Aluminum in the beaker appears to decrease over time.

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Answer

C. A reddish-brown precipitate forms on the bottom of the beaker.

Explanation

2 Al + 3 CuCl2 -----> 3 Cu +2 AlCl3

All the observations in the options would support that this chemical reaction has occurred EXCEPT

C. A reddish-brown precipitate forms on the bottom of the beaker.

This is because the color of the AlCl3 in the solution formed is colorless. The color of CuCl2 when stirred and dissolved in the liquid is blue and as the aluminum reacts with it, the color changes to a colorless as AlCl3 is formed and consequently, the amount of Al decreases over time.

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