Double+Replacement

flat =Description= __**Description of Suspect and Behavior (Description of Reaction & General Equation)**__ Double Replacement occurs within a compound when a nonmetal is replaced by a nonmetal, and a metal is replaced by a metal. From this reaction, a precipitate, an insoluble gas, or a molecular compound is formed as a result. =Examples= __**Examples Illustrating the behavior (Equations)**__ HCl + NaOH ---> NaCl + H2O AgNO3+ NaCl ---> AgCl + NaNO3 KOH + H2SO4 ---> K2SO4 + H2O AgNO3 + KCl > AgCl + KNO3 Fe2O3 + HCl --> FeCl3 + H2O KOH + H2SO4 ---> K2SO4 + H2O FeS + HCl ---> FeCl2 + H2S NaCl + H2SO4 ---> Na2SO4 + HCl NaNO3(aq)+ KCl(aq)‑‑‑‑> NaCl(aq)+ KNO3(aq) AgNO3 (aq) + KCl (aq) ‑‑‑‑> AgCl (s) + KNO3 (aq) __**Real-Life examples showing this behavior and documentation (with equations and video/picture)**__ Marble statues (CaCO3) attacked by acid rain (containing HNO3).
 * __Real-Life Examples__**

CaCO3 + 2HNO3 > Ca(NO3)2 + H2O + CO2 

Thomas Roberts fatty acid + sodium hydroxide ---> soap molecule + water Baking soda (NaHCO3) reacts with acidic substances (HA) in cake batter in a double replacement reaction:

NaHCO3+HA-->NaA+H(HCO3) H(HCO3) is more commonly know as H2CO3. It decomposes into CO2 and Water. The CO2 is responsible for making the cake rise.

How is marble eroded by acid rain? Atmospheric sulfur dioxide combines with rainwater to create sulfurous acid. The primary component of marble is calcium carbonate (CaCO3). The sulfurous acid reacts with the CaCO3 in the marble and dissolves it Marble statues (CaCO3) attacked by acid rain (containing HNO3). CaCO3 + 2HNO3 > Ca(NO3)2 + H2O + CO2

An antacid (calcium hydroxide) neutralizes stomach acid (hydrochloric acid). Ca(OH) ﻿2 + 2 HCl CaCl 2 + 2 H 2 O ferric ion and the phosphate ion bond forming ferric phosphate. Three separate molecules of sodium chloride are formed when the three sodium ions are released and when the three phosphate ions are released. =Student Experiments= __**Re-creation of the crime (Student experiment illustrating the reaction with video)**__