Which would show an example of how physical changes are reversible? Cutting a gold bar in two peices and then putting the pieces next to eachother. Or burning a match and then relighting it. Or melting tin and then cooling it into a mold. Or combining sodium and chlorine to make the new material of table salt

Question

Physics

Alexandria Lynch

14 January, 18:05

Which would show an example of how physical changes are reversible? Cutting a gold bar in two peices and then putting the pieces next to eachother. Or burning a match and then relighting it. Or melting tin and then cooling it into a mold. Or combining sodium and chlorine to make the new material of table salt

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Answers (2)

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Yaritza Greene · Answer 1

Cutting a gold bar as well as melting tin but if I had to choose one I'd choose the gold bar

Caitlin Craig · Answer 2

Melting tin, then cooling it into a mold.

You're only melting a solid into a liquid, then back into a solid. You're not making a completely new substance.