A physical change, such as a state change or dissolving, does not create a new substance, but a chemical change does. ... 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.
Key P = pressure of the gas n= number of moles of the gas V= volume of the gas R = the gas constant T= absolute temperature of the gas If V is halved when n and T remain the same
