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

Option (C) is the correct answer.

Explanation:

A change in which there will be no formation of a new compound and in which there occurs no change in chemical composition is known as a physical change.

Also, a change in which reactants can be recovered from the products or vice versa is known as a reversible change.

For example, melting tin and then cooling it into a mold is a physical change as no new compound is forming. Also, it is a reversible change because by heating the tin we can melt is again.

Thus, we can conclude that melting tin and then cooling it into a mold show an example of how physical changes are reversible.

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.

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