1. Two reagents are being used in this experiment with which you must be extremely careful. Which reagents are they? What safety precautions must be taken to account for this? 2. Deseribe the method of weighing by difference. What is the advantage of weighing by difference over using a piece of weighing paper on the balance to determine the mass of a reactant used? 3. If the instructions ask you to collect a mass of sample of 1.50.1g, what is the smallest mass that should be obtained? Largest Mass? 4. Write the balanced chemical equation for the reaction of elemental zinc with elemental iodine. (Remember that some elements are diatomic)