Taylor mixes liquids together in a beaker. A solid forms at the bottom of the beaker, and the liquid changes from pink to blue. What can you determine about the properties of the products?
That they are chemically different from those of the starting materials.
And, of course, in the process described a chemical change has occurred.
Chemical change is characterized by the formation of new substances, and the making and breaking of strong chemical bonds. That chemical change has occurred is usually signified by a colour change, which certainly happened in the process described.
We would thus infer that the properties of the products are chemically different to those of the starting materials.