[babygirl_15]

How do you tell if an equation has no reaction? I can't remember, and I missed one of the days they were talking about it. I have the homework, but I don't know which problems have no reaction. Please help.
Thank you in advance.

[Arkcon]

You're going to have to give us some examples of reactions you know will happen, reactions you know won't and some that you're unsure about.  We don't know what level of chemistry you're working at, and the are too many possibilities.

[babygirl_15]

I'm in my first year in Chemistry. I know that it has something to do with certain metals that are higher then others, and I also know it has to do with Solubility rules, but I missed the day we went over the solubility rules.

[Arkcon]

Oh good, you've at least heard of those two concepts, that helps. For a minute there, I thought I was going to have to type a couple of years worth of chemistry into this little box. Now, lets see some examples of assigned problems.

[Padfoot]

I'm in my first year in Chemistry. I know that it has something to do with certain metals that are higher then others

Maybe your teacher was talking about:
http://en.wikipedia.org/wiki/Single_displacement_reaction
http://www.kentchemistry.com/links/Kinetics/PredictingSR.htm