How can you tell if a double replacement reaction will occur?

will a double replacement reaction occur if KOH is mixed with Pb(NO3)2 ? I am thinking that is does but i wanted to know the ways you can tell?How can you tell if a double replacement reaction will occur?Yeah i think it will.cuz u need to have two compounds reacting and 2 products forming, which i think you do have.How can you tell if a double replacement reaction will occur?I don't think so.... From what I remember last year you need 2 reactants on both sides of the equation for a double replacement to occur (thats how you tell).

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