Name: Date: Unit 4 Unit Test B are made using a catalyst that causes a chemical reaction. The old catalyst makes a different molecule than a new catalyst. The diagram shows a model of the difference. The lines in the diagram represent repeating units of bonded hydrogen and carbon atoms. molecule produced with the new catalyst starting material ethylene = myrhyth Aloms Carbon Hydrogen molecule produced with the old catalyst Both ways make a very lightweight plastic. But the new catalyst allows for stiffer plastic. Determine whether the regrouping of atoms to form a new substance occurs when plastic is made. Ex- plain how you know.​