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An iron nail was placed in an open test tube containing some salt solution, and then left for a week for observations. The experimental setup and observations are shown below.
Which of the following best demonstrates that a chemical change has taken place?
The salt solution was discolored after a week.
The volume of the salt solution has decreased.
The mass of the salt solution, beaker and nails decreased.
The iron nail is still undissolved in the solution after a week.
Answers: 2
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