Imagine you are in a laboratory. you are exploring the following reaction: a + b → c when the product c is created, bubbles form. when 10ml of a is added to 10ml of b, the reaction takes twenty seconds. your teacher gives you three unknown substances (x, y, and z), one of which is a catalyst for the reaction. design an experiment to test substances x, y, and z to determine which one is a catalyst for the reaction.