When an iron nail is dropped into a beaker containing a solution of copper sulphate, after a while, both the solution and the iron nail change colour. The nail gets a brownish coating and the solution turns green. The nail has a coating of Copper on its surface and the solution is detected to have the presence of an iron containing compound. Which kind of change does this experiment signify and why?
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(a) Physical change, because the nail only changes color on the surface not the whole.
(b)Chemical change, due to deposit of a new substance on the nail.
(c)Physical change, due to deposit of a different substance on the nail’s surface.
(d)Chemical change, because both, solution and solvent have a change
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Answer: a) Physical change, because the nail only changes color on the surface not the whole.
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