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Which would show an example of how physical changes are reversible?
cutting a gold bar in two pieces and then putting the pieces next to each other
burning a match and then relighting it
melting tin and then cooling it into a mold
combining sodium and chlorine to make the new material of table salt
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Final answer:

Reversible physical changes can be undone, such as melting tin and then cooling it back into a solid form.


Explanation:

Reversible physical changes involve alterations in a substance that can be undone. An example of this is melting tin and then cooling it into a mold, as the process of melting tin can be reversed by cooling it back to its solid form.


Learn more about Physical and chemical changes here:

https://brainly.com/question/38267226


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