Classifying Chemical Reactions

Common Reaction Notation Reactants are always on the left hand side Products are always on the right hand side Means to yield or produce Example: Peanut Butter + Jelly + Bread  PB&J Sandwitch

Combustion Reactions Burning something Combining it with oxygen CH4 + O2  CO2 + H2O

Synthesis Reactions Two or more substances combine to make one product Transfer of electrons A + B  AB 2Na + Cl2  2NaCl

Decomposition Reactions One reactant breaks down into two or more substances AB  A + B Usually require heat, electricity, or light H2O  H2 + O2

Single Replacement Reactions One element replaces another element in a compound A + BC  AC + B Cu + 2AgNO3  Cu(NO3)2 + 2Ag

Double Replacement Reactions AX + BY  BX + AY Two compounds switch ions Usually form a precipitate – a solid Pb(NO3)2 (aq) + KI (aq)  PbI2(s) + KNO3(aq)

BaCl2 + Na2(SO4)  NaCl + Ba(SO4) Classify each reaction as synthesis, decomposition, combustion, single replacement, or double replacement H2 + O2  H2O    Na + H(OH)  Na(OH) + H2 HgO  Hg + O2 Al + Fe2O3  Al2O3 + Fe C2H5OH + O2  H2O + CO2 H2 + N2  NH3 NH4NO2  N2 + H2O BaCl2 + Na2(SO4)  NaCl + Ba(SO4)