A. Yes, because a new material of a different color formed on part of the metal strip.
The changes observed on the metal strip suggest that a chemical reaction likely occurred between the metal and the solution. The formation of a new material of a different color, the dark coat of flaky material, and its ability to fall off when touched all support the occurrence of a chemical reaction. The fact that the solution stayed blue and the volume remained the same does not necessarily indicate the absence or presence of a chemical reaction.
The solution is lighter in color
The volume of the solution is the same
The metal strip is shiny above the surface of the solution
The metal strip is not shiny below the surface of the solution
The metal strip below the surface of the solution has a dark coat of flaky material
When the metal strip is touched, the flaky material falls off
Based on the observations, can the students correctly conclude that a chemical reaction occurred?
A. Yes, because a new material of a different color formed on part of the metal strip
B. No, because the solution stayed blue
C. Yes, because the volume of the blue solution stayed the same
D. No, because the metal strip was still visible
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