Classifying Reactions. 6 Subgroups. Formation (Synthesis) Reactions (F). Element + Element Compound E + E C Examples: Hydrogen and oxygen combine to form water. Carbon and hydrogen combine to form methane. Zn + S 8 ZnS Cl 2 + Na NaCl Hg + O 2 HgO.
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Element + Element Compound
Compound Element +Element
Element + Compound Compound + Element
Compound + Compound Compound + Compound
Fuel + O2 CO2 + H2O
Any reactions that don’t fit the previous 5 patterns is classed as “other”.