What do u notice about the molecules before and after the chemical reaction

Explanation:

In a chemical reaction, the atoms and molecules produced by the reaction are called products.

In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed.

In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

I don't know if this is necessarily a chemistry question

But the reason heat transverses to the shirt is because of a difference of temperature between the two objects, the shirt being cooler, and the heat will move from an area of high temperature to an area of low temperature to cause the environment as a whole to become equal. Much like how solvents move to areas of low solute concentration to areas of low solute concentration during diffusion.