DO NOW: (On a sheet of notebook paper) 1 DO NOW: (On a sheet of notebook paper) 1. When looking at a reaction, which side of the arrow are the products located? Which side of the arrow are the reactants located? 2. What is the law of conservation of mass? 3. What are the numbers called that you place in front of products & reactants to balance a reaction? What do these numbers represent? 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… Balance all 5 types of chemical reactions Be able to identify a reaction as synthesis, decomposition, single replacement, double replacement, or combustion! heat Pt

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

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

Element + Compound  Element +Compound Single Replacement: An element and compound react to form a different element and compound Common form: Element + Compound  Element +Compound A + BC  AC + B heat Pt

Compound + Compound  Compound +Compound Double Replacement: Two compounds react to form two new compounds Common form: Compound + Compound  Compound +Compound AB + CD  AD + CB heat Pt

___ CH4 + ___O2  ___CO2 + ___H2O Tip: Balance the O2 last. 5. Combustion: A reaction with oxygen (O2) ___ CH4 + ___O2  2 ___CO2 + ___H2O 2 1 C 1 4 H 2 4 4 2 O 3 4 Tip: Balance the O2 last.

Work on your Worksheet! Due at the end of class! 2 6 12 4 2 1 N 2 4 6 2 O 1 3 6