which would show an example of how physical changes are reversible? cutting a gold bar in two pieces and…

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

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

Answer

Brief Explanations:

Un cambio físico es reversible y no cambia la identidad química de la sustancia. La fusión del estaño y su enfriamiento en un molde es un ejemplo de cambio físico reversible. Al fusionar el estaño, solo cambia de estado físico (sólido a líquido) y al enfriarlo vuelve a ser sólido sin cambiar su identidad química. Cortar un bar de oro no es un cambio reversible en el sentido de volver a unirlo perfectamente a su estado original. Quemar un fósforo es un cambio químico irreversible. Combinar sodio y cloro es una reacción química irreversible.

Answer:

melting tin and then cooling it into a mold