I rushed through the predictions because I wanted to get to the experimentation. I got a few of them wrong for this reason. I'm sure that there are a few exceptions here and there in the reference tables, yet New York State decided not to include them because they are so minor. When writing a double replacement reaction I follow this procedure: AX + BY ----->AY + BX, then if the charges are equal on the products, the subscripts become coefficients. If not, standard equation balancing methods should be applied. Finally, whichever product is not soluble is labeled as solid, and whichever product is soluble is labeled as aqueous.
Enrichment: Various carcinogen compounds are removed from waste water. Most of them contain sulfate, which can combine to create a precipitate, and can later be filtered out.
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