1. The problem statement, all variables and given/known data Which of the following combinations (in water) causes a reaction? Write a balanced reaction equation for the cases that cause reaction: CU2+ + H2(g) Fe2+ + AG Fe3+ + Sn2+ etc.... 2. Relevant equations Not applicable. 3. The attempt at a solution I've searched quite a bit, but every youtube video I find, and every site I find, explain how to analyze which TYPE of reaction we're dealing with, based on knowing both the reactants and the products. My task doesn't reveal the product. I need to figure that out. And that's what I need help with. A: These elements will synthesize if one is an anion and the other is a cation. I count up the charges and balance the equation accordingly. Is this correct? Is that all there is to it? B: What is the significance of the water, and why is the water not in the list of reactants? I've been reading http://misterguch.brinkster.net/6typesofchemicalrxn.html, but it doesn't explain how to figure out what products are formed. Help would be very much appreciated!