CHAPTER+SEVEN+CHEMICAL+REACTIONS>>>

the emission of light, the emission or absorption of heat.
 * know the evidence for a chemical reaction this includes: change in temp, the formation of a solid, formation of a gas, a color change,


 * know how to write and balance a chemical equation.

SOLUBILITY RULES
//Compounds containing the Following ions are mostly **soluble:**// Li+, Na+, K+, NH(4)+ NO EXCEPTIONS NO(3)-, C(2)H(3)O(2)-, NO EXCEPTIONS Cl-, Br-, I- exceptions: when any of these ions pairs with Ag+, Hg(2) +2, or Pb +2, the compound is insoluble. SO(4) -2 exceptions: when it pairs with Sr +2, Ba +2, Pb +2, or Ca +2, the compound is insoluble.

//Compounds containing the following ions are mostly **insoluble:**// OH-, S -2 exceptions: when eithere of these ions pairs with Li +, Na +, K +, or NH (4) +, the compound is soluble. when S -2 pairs with Ca +2, Sr +2, or Ba +2, the compound is slightly soluble. CO (3) -2, PO (4) -3 when either of these ions pairs with Li +, Na +, K +, NH (4) +, the compound is soluble.