Mindy places a strip of zinc in a copper sulfate solution, as shown in the photo. She expects to see a precipitate of copper
forming but does not.
Which statement explains the most likely cause of this observation?
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A. The temperature of the solution is too high.
B. The piece of zinc placed in the solution is too small. C. The concentration of the cooper sulfate is too low. D. The concentration of the copper sulfate is too high.

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano. the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? a. positive force, balanced force, negative force b. negative force, balanced force, positive force c. positive force, unbalanced force, negative force d. negative force, unbalanced force, positive force