DO NOW: On your notes for today DO NOW: On your notes for today! 1)K3(PO3) 2) PF5 3) H2(S2O3) 4) GaF3 5)N2O4 Upper left: Thermite reaction, Fe2O3 + Al => 2Fe +2Al2O3 + HEAT!!! http://en.wikipedia.org/wiki/Thermite Upper right: potassium in water, K + H2O => KOH + H2 + HEAT Bottom right: potassium chlorate and sugar, C12H22O11 + 8KClO3 => 12CO2 + 11H2O + 8KCl + HEAT!!! http://lecturedemos.chem.umass.edu/chemReactions5_5.html Bottom left: magnesium reacting with oxygen, Mg + O2 => MgO

After today you will be able to… Identify synthesis and decomposition reactions Predict the products in words for synthesis and decomposition reactions heat Pt

Types of Chemical Reactions Synthesis Decomposition Single Replacement Double Replacement Combustion heat Pt

Element + Element  Compound Predicting Products Synthesis: Two elements combine to form a compound Common form: Element + Element  Compound A + B  AB heat Pt

Examples of synthesis: sodium + chlorine  magnesium + phosphorus  sulfur + aluminum  (Metal) (Non-metal) (Metal) (Non-metal) sodium chloride magnesium phosphide aluminum sulfide heat Pt

Compound  Element + Element Predicting Products 2. Decomposition: A compound breaks down into elements and/or smaller compounds Common form: Compound  Element + Element AB  A + B heat Pt

DEMONSTRATION! Decomposition of Ammonium Dichromate BALANCE IT!!!!! _(NH4)2Cr2O7(s) _N2(g) + _H20(g) + _Cr2O3(s) Compound  Element + Element AB  A + B heat Pt

Examples of decomposition: potassium nitride  potassium + nitrogen Go back to the non-metal’s original ending. heat Pt

Examples of “special” decompositions: 1. Example of a metal chlorate decomposition: barium chlorate  metal chlorate  metal chloride + oxygen (ClO3)-1 barium chloride + oxygen Always a part of the product! heat Pt

Examples of “special” decompositions: 2. Example of a metal carbonate decomposition: potassium carbonate metal carbonate  metal oxide + carbon dioxide (CO3)-2 potassium oxide + carbon dioxide Always a part of the product! heat Pt

Examples of “special” decompositions: 3. Example of a metal hydroxide decomposition: tin (IV) hydroxide metal hydroxide  metal oxide + water (OH)-1 tin(IV) oxide + water Always a part of the product! Don’t forget the Roman numeral! heat Pt

WORK ON YOUR WORKSHEET! IT IS DUE!!!