I. Types of Chemical Reactions

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Presentation transcript:

I. Types of Chemical Reactions Ch. 9 – Chemical Reactions I. Types of Chemical Reactions

Symbols used in equations the arrow separates the reactants from the products  Read “reacts to form” The plus sign = “and” (s) after the formula -solid (g) after the formula -gas (l) after the formula -liquid

CH4(g) + 2O2(g)  CO2(g) + 2H2O(g) A. Combustion the burning of any substance in O2 to produce heat A + O2  __ CH4(g) + 2O2(g)  CO2(g) + 2H2O(g)

A. Combustion 4 2________ Na(s)+ O2(g)  C3H8(g)+ O2(g)  5 3 4 Products: contain oxygen hydrocarbons form CO2 + H2O 4 2________ Na(s)+ O2(g)  C3H8(g)+ O2(g)  5 3 4 ___(g)+ _____(g)

B. Synthesis the combination of 2 or more substances to form a compound only one product A + B  ___

B. Synthesis H2(g) + Cl2(g)  2 HCl(g)

Al(s)+ Cl2(g)  2 3 2 ____(s) B. Synthesis Products: ionic - cancel charges covalent - hard to tell Al(s)+ Cl2(g)  2 3 2 ____(s)

AB _ + __ C. Decomposition a compound breaks down into 2 or more simpler substances only one reactant AB _ + __

C. Decomposition 2 H2O(l)  2 H2(g) + O2(g)

C. Decomposition 2 2 KBr(l)  __(s) + __(l) Products: binary - break into elements others - hard to tell 2 2 KBr(l)  __(s) + __(l)

A + BC  _ + __ D. Single Replacement one element replaces another in a compound metal replaces metal (+) nonmetal replaces nonmetal (-) A + BC  _ + __

Cu(s) + 2AgNO3(aq)  Cu(NO3)2(aq) + 2Ag(s) D. Single Replacement Cu(s) + 2AgNO3(aq)  Cu(NO3)2(aq) + 2Ag(s)

D. Single Replacement Fe(s)+ CuSO4(aq)  Cu(s)+ _____(aq) Products: metal  metal (+) nonmetal  nonmetal (-) free element must be more active (check activity series) Fe(s)+ CuSO4(aq)  Cu(s)+ _____(aq) Br2(l)+ NaCl(aq)  N.R.

AB + CD  __ + __ E. Double Replacement ions in two compounds “change partners” cation of one compound combines with anion of the other AB + CD  __ + __

Pb(NO3)2(aq) + K2CrO4(aq)  PbCrO4(s) + 2KNO3(aq) E. Double Replacement Pb(NO3)2(aq) + K2CrO4(aq)  PbCrO4(s) + 2KNO3(aq)

E. Double Replacement Pb(NO3)2(aq)+ KI(aq)  2 2 ___(s)+ ____(aq) Products: switch negative ions one product must be insoluble (check solubility table) Pb(NO3)2(aq)+ KI(aq)  2 2 ___(s)+ ____(aq) NaNO3(aq)+ KI(aq)  N.R.