Chemical Changes Part Deux

Chemical Changes Part DeuxTypes of chemical changesSynthesis & DecompositionPrecipitationOxidationCombustionAcid-Base NeutralizationCellular Respiration & Photosynthesis1. Synthesis and Decomposition2H2 + O2 2H2O A + B AB

2H2O 2H2 + O2 AB A + BSynthesis Reaction: The combination of two or more reactants to form a new productDecomposition: The separation of a compound into two or more compounds or elements2. Precipitation

2. PrecipitationCdSO4 (aq) + K2S (aq) CdS (s) + K2SO4 (aq)

2 NaOH (aq) + MgCl2 (aq) 2 NaCl (aq) + Mg(OH)2(s)

CuSO4 (aq) + 2NaOH (aq) Cu(OH)2 (s) + Na2SO4 (aq)2. PrecipitationFormation of an insoluble, or only slightly soluble, solid substance (precipitate), when two aqueous solutions are combined3. Oxidation

OxidationChemical change involving oxygen or a substance with properties similar to those of oxygen4. Combustion a type of oxidation

Form of oxidation that releases a large amount of energy5. Acid-Base NeutralizationAcid (aq) + Base (aq)Salt (aq) + Water (l)H+ ionsOH- ionsIf H+ = OH- ?If H+ > OH- ?If H+ < OH- ?Reaction of an acid with a base to form a salt and waterHeart Burn

Stomach Acid + AntacidSalt + Water

Neutralization of HCl and NaOHHCl (aq)H+ (aq) + Cl- (aq)NaOH (aq)OH- (aq) + Na+(aq)H2ONaClHCl (aq) + NaOH (aq)NaCl (aq) + H2O (l)Recognizing Acid-Base Neutralization ReactionsHCl (aq) + NaOH (aq)NaCl (aq) + H2O (l)